Difference: SchannelNLO (1 vs. 53)

Revision 53
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NLO s-channel studies

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  • list used cuts, cite prospects single top lhc note (contains both atlas and cms) => do it like in old paper
  • table from measureEfficiencies
  • interpret table
Changed:
<
<
  • low acceptance => due to pt cuts (reference to pt...) reduce to 20 Gev would help a lot
>
>
  • low acceptance => due to pt cuts (reference to pt...) reduce to 20 Gev would help a lot???
 
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...
  • interpret
  • for the following discussion: loose cut set
Line: 403 to 403
 
    • => pol depending on Wz => prescription?

D. Distributions for three-jet event
Changed:
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  • fig 16,17: jet 3 distributions, delta R, angular
>
>
  • large number (see Fig...)
  • 1. kinematic distributions of the extra jet
  • production stage vs. decay stage gluon radiation
  • fig 16: jet 3 distributions (pt, eta)
 
  • How do I figure out the percentage for the third jet to be from the gluon?
Added:
>
>
  • fig 17: delta R, angular
 
  • prescription for dealing with extra jet?

V. SINGLE TOP PRODUCTION AS BACKGROUND TO SM HIGGS SEARCHES ??? => maybe rather single top and new physics

  • fig 19, 20: invariant mass of bbar, angular distance bbar

VI. CONCLUSIONS

Added:
>
>
  • Summarize important results of chapters
  • Cross Section, Acceptance, Kinematic distributions (bbar, reconstruction and top, top polarization, three jet events)
  • a lot of three-jet events
  • largest contribution to cross section: INIT corrections
  • 6% range dependence on top mass
  • signature
  • acceptance 30 %
  • reconstruction best-jet algorithm
  • different eta distributions top antitop
  • correlations
 

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  • take titles out of used graphs => in CombineHistos, SetTitle("");
  • some legends have to be shifted: (just go to makeObjectPlots... and change legend corner, can be found in CombineHistos.C)
  • legend corners: 10 upper left, 20 upper right, 11 lower left, 21 lower right, 31 center, 32 upper right-hand
Added:
>
>
  • PUT IN EXTRA CHAPTER ON SPIN CORRELATIONS?
 
    • HT sum
    • (optimal basis boosted 4000)
Line: 385 to 386
 

C. Kinematic and Spin Correlations / Top quark polarization
Added:
>
>
  • 1. bbar correlations
 
    • fig 12: transverse momentum, diff between best, non -best
Changed:
<
<
    • stuff/correlation pics from my old work?
    • b, bbar correlation
    • top polarization measurements (explain bases, helicity, optimal, beamline => careful with s-channel names)
    • fig 14: helicity basis, optimal basis => before and after cuts, explain cut effects, anti important?
>
>
  • 2. Top quark polarization measurements
    • explain correlations for top polarization
    • explain bases, show histos
    • helicity
    • explain tbbarj, tbbar frames for helicity basis (see t-channel paper appendix) (=> in makeObjectPlotsblblabla, copy numbers into table)
    • show histos, before after cuts, anti important? 3 jet events
    • optimal
    • problematic optimal basis
    • => (basically beamline basis)
    • => polarization for >2500 GeV
 
    • degree of polarization
Changed:
<
<
    • problematic optimal basis => prescription, polarization depending on momentum of intermediate W, for >4000 GeV
    • table of polarizations
    • tbbarj, tbbar frames for helicity basis (see t-channel paper appendix)
>
>
    • table of polarizations (add >2500 to it)
    • => pol depending on Wz => prescription?
 

D. Distributions for three-jet event
  • fig 16,17: jet 3 distributions, delta R, angular
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NLO s-channel studies

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  • list used cuts, cite prospects single top lhc note (contains both atlas and cms) => do it like in old paper
  • table from measureEfficiencies
  • interpret table
Added:
>
>
  • low acceptance => due to pt cuts (reference to pt...) reduce to 20 Gev would help a lot
 
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...
  • interpret
  • for the following discussion: loose cut set

IV. SINGLE TOP EVENT DISTRIBUTIONS

Added:
>
>
    • kinematic properties, repeat signature
    • jet identification
 
  1. Final State Object Distributions
Changed:
<
<
    • lepton, missing ET: fig 5 electron, neutrino ? or too much repetition?
>
>
    • final state distributions after event reco and after applying loose set
  • 1.
    • lepton, missing ET: fig 5 electron, neutrino ? or too much repetition? I need pt distribution anyways...for cut explanation
    • top, anti, interpret
  • 2.
 
    • b, bbar jets (from partons): fig 7 b, bbar
    • compare b, bbar jets eta distribution, explain differences, look at top, antitop, spin correlation picture? also INIT...shifts
Added:
>
>
  • 3.
 
    • Ht => INIT, FNAL, DEC contribution shifts

B. Event Reconstruction
Added:
>
>

 
    • check: ANTI important/different?
Changed:
<
<
    • reconstruction MET => neutrino
    • top quark reco => b jets problem => best jet => with third jet: bg jet including gluon
    • percentage best jet real b jet
>
>
    • correlations between particles => reconstruct object completely, including intermediate particles
    • W boson reco from lepton and MET (no pz of neutrino, but require W mass) => two solutions, take smaller (see old paper, cite)
    • top quark reco => b jets problem => best jet => with third jet: bg jet including gluon (cite old paper, repeat some of explanation)
    • best jet + b-tagging or Meb or eta separation?
    • percentage best jet real b jet => Integral over both whole area and bg area => divide = 80 %
 
    • fig 9: best jet is b jet...
Changed:
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<
    • fig 10: top peak wth best jet... top quark width comment
>
>
    • fig 10: top peak wth best jet... top quark width comment ...two competing effects
 
    • fig 11: top pt, eta at parton level and after cuts

Added:
>
>

  C. Kinematic and Spin Correlations / Top quark polarization
    • fig 12: transverse momentum, diff between best, non -best
    • stuff/correlation pics from my old work?
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NLO s-channel studies

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  • uncertainty due to NLO predictions (charlie)

III. SINGLE TOP ACCEPTANCE STUDIES

Changed:
<
<
  • final state
  • signature
  • parton level => only simple kinematical cuts
  • jet algorithm => cite old paper
  • list used cuts, cite prospects single top lhc note (contains both atlas and cms)
  • tabel from measureEfficiencies (conesize???)
>
>
  • final state objects
  • only leptonic decay channel
  • signature: one charged lepton, missing transverse energy and two or three jets
  • parton level => only approx of kinematic acceptance (no detector effects as b-tagging efficiency, jet energy resolution)
  • jet algorithm (jet must be infra-red safe) => cite old paper
  • list used cuts, cite prospects single top lhc note (contains both atlas and cms) => do it like in old paper
  • table from measureEfficiencies
  • interpret table
 
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...
Added:
>
>
  • interpret
  • for the following discussion: loose cut set
 

IV. SINGLE TOP EVENT DISTRIBUTIONS

  1. Final State Object Distributions
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Major changes

  • new cut class: Cut_Basic_LHC.cpp with the proposed cuts in the ATLAS CSC note ("Prospect for single top measurement in ATLAS")
Added:
>
>
  • loose cuts (preselection cuts):
    • deltaR > 0.4 between jets/leptopn (isolation cut)
    • abs(eta) (lepton) < 2.5
    • exactly one lepton pT>30 GeV
    • 2 or 3 jets, >30 GeV
    • eta for jets <5
    • at least one b tagged jet
    • MET > 20 GeV
  • tight cuts:
    • 2 jets b-tagged
    • 50 GeV pt cut for all jets
    • eta < 2.5 for jets
    • lepton cuts unchanged

  • ATLAS cuts different
  • 1. loose
    • 2 jets only
    • energy in cone around lepton deltaR=0.2 be less than 6 GeV
    • veto cut on another lepton with pT >10 GeV
    • opening angle between jets: 0.5 <deltaR(b,bbar)<4.0
    • total jet transverse momentum HT: 80 <= HT(jets) <= 220 geV
    • lepton/neutrino transverse momentum: 60 <= MET + pT (lep) <130 GeV
  • 2. tight
    • jet veto on any third jet > 15 GeV

  • CMS cuts
  • 2. tight
    • 1 lepton pT>19 GeV
    • eta (el) < 2.4
    • eta (muon) < 2.1
    • eta(jet) < 2.5
    • exactly two jets pT> 50 GeV (!)
    • MET> 30 GeV
    • veto cut on further lepton with pt > 10 GeV
    • veto cut on further jet with pT> 20 GeV
    • further cuts after reconstruction; total hardness HT, MT, M(t), sigmaT
 

  • option for event mirroring: GetNextMirrorEvent() and readMirrorEvent() in Particles.cpp and included in nloanalysis.cpp in the loop.
    It takes every event a second time with -px and -pz, to enforce LHC symmetry.
Line: 306 to 344
 
  • uncertainty due to NLO predictions (charlie)

III. SINGLE TOP ACCEPTANCE STUDIES

Changed:
<
<
  • list used cuts, cite ATLAS note
  • CMS cuts => CMS internal note
  • cone sizes
>
>
  • final state
  • signature
  • parton level => only simple kinematical cuts
  • jet algorithm => cite old paper
  • list used cuts, cite prospects single top lhc note (contains both atlas and cms)
  • tabel from measureEfficiencies (conesize???)
 
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...

IV. SINGLE TOP EVENT DISTRIBUTIONS

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  • discuss effects of corrections, sdec small -> cite old paper
  • discuss top-antitop difference

B Top quark mass and Renormalizing/Factorization scale
Changed:
<
<
  • top mass dependence
  • scale dependence
>
>
  • uncertanties: top quark mass, renormalization/factorization scales * top mass => want to know how top mass accuracy affects cross section prediction
  • explain renormalization, factorization scale
  • we work at fixed order => scale dependence
  • top mass dependence => cross section changes roughly 10% for +-5 GeV
  • top - antitop (ratios) =>
  • scale dependence => NLO reduces scale dependence (makes sense as scale dependence comes from higher orders)
 
  • top - antitop (ratios)
Changed:
<
<
  • => pictures top antitop productions, pdf?
  • NLO uncertainty test (charlie)
>
>
  • uncertainty due to NLO predictions (charlie)
 

III. SINGLE TOP ACCEPTANCE STUDIES

  • list used cuts, cite ATLAS note
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NLO s-channel studies

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  • signature?
  • motivation nlo
  • generator description => cite old paper
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<
  • previous calculations
>
>
  • previous calculations, Sullivan...with jets instead of partons???
 
  • top - antitop asymmetry
  • outline paper
Line: 284 to 284
 
  • electron only, applies to muon, too
  • factor 9 / 9.2 ?
  • comment on top quark mass = 175?
Changed:
<
<

A ???
  • total cross section: add up contributions from born level, init,,,,
>
>

 
  • we adopt phase space slicing method => theoretical cutoff dependence (cite old paper), choose 5 GeV^2
  • absolute cross section
Added:
>
>

A Inclusive cross section
  • total cross section: add up contributions from born level, init,,,,
  • explicit diagrams in theo-paper (cao)
  • finite widths of t, W
  • cross section table with INIT, FINAL...contributions (measure efficiencies)
  • discuss effects of corrections, sdec small -> cite old paper
  • discuss top-antitop difference
 
B Top quark mass and Renormalizing/Factorization scale
  • top mass dependence
  • scale dependence
  • top - antitop (ratios)
  • => pictures top antitop productions, pdf?
  • NLO uncertainty test (charlie)
Changed:
<
<

C Inclusive cross section
  • cross section table with INIT, FINAL...contributions (measure efficiencies)
>
>
 

III. SINGLE TOP ACCEPTANCE STUDIES

Line: 338 to 343
 
  • How do I figure out the percentage for the third jet to be from the gluon?
  • prescription for dealing with extra jet?
Changed:
<
<

V. SINGLE TOP PRODUCTION AS BACKGROUND TO SM HIGGS SEARCHES

>
>

V. SINGLE TOP PRODUCTION AS BACKGROUND TO SM HIGGS SEARCHES ??? => maybe rather single top and new physics

 
  • fig 19, 20: invariant mass of bbar, angular distance bbar

VI. CONCLUSIONS

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  • previous calculations
  • top - antitop asymmetry
  • outline paper
Deleted:
<
<

II. CROSS SECTION (INCLUSIVE RATE)

 

Added:
>
>

II. CROSS SECTION (INCLUSIVE RATE)

  • we need exact theoretical prediction for cross section for: Vtb, new physics
  • we present numerical results...
 
  • cteq6.6
  • generator properties: values of constants (schan_51.check)
Added:
>
>
  • electron only, applies to muon, too
  • factor 9 / 9.2 ?
 
  • comment on top quark mass = 175?
    A ???
Changed:
<
<
  • theoretical cutoff dependence (cite old paper)
>
>
  • total cross section: add up contributions from born level, init,,,,
  • we adopt phase space slicing method => theoretical cutoff dependence (cite old paper), choose 5 GeV^2
 
  • absolute cross section

B Top quark mass and Renormalizing/Factorization scale
  • top mass dependence
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    • four fermion interactions (new yuan)
    • FCNC (flavour changing neutral current) (production or decay
  • new physics background => higgs
Added:
>
>
    • Wt background for H-> WW and for charged Higgs
    • s-channel?
    • t-channel?
 
  • signature?
  • motivation nlo
Deleted:
<
<
  • comment on top quark mass = 175?
 
  • generator description => cite old paper
  • previous calculations
  • top - antitop asymmetry
  • outline paper

II. CROSS SECTION (INCLUSIVE RATE)

Added:
>
>

  • cteq6.6
 
  • generator properties: values of constants (schan_51.check)
Added:
>
>
  • comment on top quark mass = 175?
    A ???
  • theoretical cutoff dependence (cite old paper)
 
  • absolute cross section
Added:
>
>

B Top quark mass and Renormalizing/Factorization scale
 
  • top mass dependence
  • scale dependence
  • top - antitop (ratios)
Changed:
<
<
>
>
  • => pictures top antitop productions, pdf?
  • NLO uncertainty test (charlie)

C Inclusive cross section
  • cross section table with INIT, FINAL...contributions (measure efficiencies)
 

III. SINGLE TOP ACCEPTANCE STUDIES

  • list used cuts, cite ATLAS note
  • CMS cuts => CMS internal note
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NLO s-channel studies

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  • page numbers
  • citations (to compare cuts, pictures, cross sections and top mass)
  • Fig.
Changed:
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<
  • W-boson
>
>
  • W boson
 
  • s-channel single top quark production
  • take titles out of used graphs => in CombineHistos, SetTitle("");
  • some legends have to be shifted: (just go to makeObjectPlots... and change legend corner, can be found in CombineHistos.C)
Line: 255 to 255
 

0. ABSTRACT

I. INTRODUCTION

Added:
>
>
  • tevatron results so far (discovery)
 
  • single top production modes at LHC
  • properties single top => spin, Vtb
Added:
>
>
    • new physics (top mass closest to ew symmetry breaking scale, affects all three channels differently => independent tests, discrimination between models):
    • sensitivity to additional bosons (see Tait, CP's paper)
    • charged Higgs boson (Lucotte, Chevalier 2008 & yue zhou)
    • modified Wtb and Wqq' coupling (new yuan, aguilar saavedra)
    • four fermion interactions (new yuan)
    • FCNC (flavour changing neutral current) (production or decay
 
  • new physics background => higgs
Deleted:
<
<
  • sensitivity to additional bosons (see Tait, CP's paper) & charged Higgs boson (Lucotte, Chevalier 2008)
  • tevatron results so far (discovery)
 
  • signature?
  • motivation nlo
Added:
>
>
  • comment on top quark mass = 175?
 
  • generator description => cite old paper
  • previous calculations
  • top - antitop asymmetry
  • outline paper

II. CROSS SECTION (INCLUSIVE RATE)

Changed:
<
<
  • generator properties: values of constants
>
>
  • generator properties: values of constants (schan_51.check)
 
  • absolute cross section
  • top mass dependence
  • scale dependence
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100. Outline of the paper

Let's fetz...Don't forget:
Formalities
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>
>
  • how to cite atlas note?
 
  • page numbers
  • citations (to compare cuts, pictures, cross sections and top mass)
  • Fig.
  • W-boson
  • s-channel single top quark production
Changed:
<
<
  • take titles out of used graphs
>
>
 
  • some legends have to be shifted: (just go to makeObjectPlots... and change legend corner, can be found in CombineHistos.C)
  • legend corners: 10 upper left, 20 upper right, 11 lower left, 21 lower right, 31 center, 32 upper right-hand
Line: 255 to 256
 

0. ABSTRACT

I. INTRODUCTION

  • single top production modes at LHC
Added:
>
>
  • properties single top => spin, Vtb
 
  • new physics background => higgs
  • sensitivity to additional bosons (see Tait, CP's paper) & charged Higgs boson (Lucotte, Chevalier 2008)
  • tevatron results so far (discovery)
Added:
>
>
  • signature?
  • motivation nlo
  • generator description => cite old paper
  • previous calculations
 
  • top - antitop asymmetry
  • outline paper

II. CROSS SECTION (INCLUSIVE RATE)

Revision 29
Changes from r27 to r29
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  • Fig.
  • W-boson
  • s-channel single top quark production
Added:
>
>
  • take titles out of used graphs
  • some legends have to be shifted: (just go to makeObjectPlots... and change legend corner, can be found in CombineHistos.C)
  • legend corners: 10 upper left, 20 upper right, 11 lower left, 21 lower right, 31 center, 32 upper right-hand
    • HT sum
    • (optimal basis boosted 4000)
    • histo_topptsums_parton
  • weird plots
    • histo_bEff_compare_aftercuts => doubly printed?
    • (histo_bJetbbarJetEta_aftercuts => doubly printed?)
    • histo_bgTopPtsums_aftercuts => looks illegal, but is "from bg"
    • topmass_compare => why still in fb?
 


Physics
  • top - antitop
Line: 235 to 250
 
  • "modified" narrow width for top quark
  • fixed value for top quark mass used
  • polarization helicity basis tbbar(j) => t-channel appendix paper...???
Added:
>
>
  • discuss different init contributions? (at least virtual and real?)
 

0. ABSTRACT

I. INTRODUCTION

Line: 261 to 277
 
  1. Final State Object Distributions
    • lepton, missing ET: fig 5 electron, neutrino ? or too much repetition?
    • b, bbar jets (from partons): fig 7 b, bbar
Changed:
<
<
    • compare b, bbar jets eta distribution, explain differences, look at top, antitop, spin correlation picture?
    • Ht => jet - spiel
>
>
    • compare b, bbar jets eta distribution, explain differences, look at top, antitop, spin correlation picture? also INIT...shifts
    • Ht => INIT, FNAL, DEC contribution shifts
 

B. Event Reconstruction
Added:
>
>
    • check: ANTI important/different?
 
    • reconstruction MET => neutrino
    • top quark reco => b jets problem => best jet => with third jet: bg jet including gluon
    • percentage best jet real b jet
Line: 279 to 296
 
    • b, bbar correlation
    • top polarization measurements (explain bases, helicity, optimal, beamline => careful with s-channel names)
Changed:
<
<
    • fig 14: helicity basis, optimal basis => before and after cuts, explain cut effects
>
>
    • fig 14: helicity basis, optimal basis => before and after cuts, explain cut effects, anti important?
 
    • degree of polarization
Changed:
<
<
    • problematic optimal basis => prescription, polarization depending on momentum of intermediate W
>
>
    • problematic optimal basis => prescription, polarization depending on momentum of intermediate W, for >4000 GeV
 
    • table of polarizations
    • tbbarj, tbbar frames for helicity basis (see t-channel paper appendix)
Revision 27
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Line: 114 to 114
 
(change only in root macros, the original histograms are still from -5 to 5)

5. b) Changes 2009

Changed:
<
<
  • I changed my cuts to 30 GeV for every jet as some distributions have residue between 15 and 30 GeV otherwise, this comes from the misinterpretation of a gluon jet as quark jet.
>
>
  • I changed my cuts to 30 GeV for every jet as some distributions have residue between 15 and 30 GeV otherwise, this comes from the misinterpretation of a gluon jet as quark jet.
 

6. Interesting physics found in the plots

1. Polarization

Line: 234 to 234
 
  • intermediate W?
  • "modified" narrow width for top quark
  • fixed value for top quark mass used
Added:
>
>
  • polarization helicity basis tbbar(j) => t-channel appendix paper...???
 

0. ABSTRACT

I. INTRODUCTION

Changed:
<
<
  • single top production modes
>
>
  • single top production modes at LHC
  • new physics background => higgs
  • sensitivity to additional bosons (see Tait, CP's paper) & charged Higgs boson (Lucotte, Chevalier 2008)
  • tevatron results so far (discovery)
 
  • top - antitop asymmetry
  • outline paper

II. CROSS SECTION (INCLUSIVE RATE)

Added:
>
>
  • generator properties: values of constants
 
  • absolute cross section
  • top mass dependence
  • scale dependence
Line: 248 to 253
 

III. SINGLE TOP ACCEPTANCE STUDIES

  • list used cuts, cite ATLAS note
Changed:
<
<
  • CMS cuts???
>
>
  • CMS cuts => CMS internal note
 
  • cone sizes
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...

IV. SINGLE TOP EVENT DISTRIBUTIONS

  1. Final State Object Distributions
Changed:
<
<
    • fig 5 electron, neutrino ? or too much repetition?
    • fig 7 b, bbar, Ht => jet - spiel
    • top - antitop (eta distributions)
>
>
    • lepton, missing ET: fig 5 electron, neutrino ? or too much repetition?
    • b, bbar jets (from partons): fig 7 b, bbar
    • compare b, bbar jets eta distribution, explain differences, look at top, antitop, spin correlation picture?
    • Ht => jet - spiel
 

B. Event Reconstruction
    • reconstruction MET => neutrino
Line: 267 to 273
 

    • fig 11: top pt, eta at parton level and after cuts

Changed:
<
<
C. Kinematical and Spin Correlations
>
>
C. Kinematic and Spin Correlations / Top quark polarization
 
    • fig 12: transverse momentum, diff between best, non -best
    • stuff/correlation pics from my old work?
    • b, bbar correlation
Line: 277 to 283
 
    • degree of polarization
    • problematic optimal basis => prescription, polarization depending on momentum of intermediate W
    • table of polarizations
Added:
>
>
    • tbbarj, tbbar frames for helicity basis (see t-channel paper appendix)
 

D. Distributions for three-jet event
  • fig 16,17: jet 3 distributions, delta R, angular
Revision 25
Changes from r23 to r25
Line: 1 to 1
 
META TOPICPARENT name="WebHome"

NLO s-channel studies

Line: 114 to 114
 
(change only in root macros, the original histograms are still from -5 to 5)

5. b) Changes 2009

Changed:
<
<
  • Somehow my cut class doesn't work properly

>
>
  • I changed my cuts to 30 GeV for every jet as some distributions have residue between 15 and 30 GeV otherwise, this comes from the misinterpretation of a gluon jet as quark jet.
 

6. Interesting physics found in the plots

1. Polarization

Line: 141 to 140
  The top is boosted stronger than the antitop as p(u) is approx. 2*p(d) due to the parton distribution function. That is why the widths are generally wider for the top than the antitop. The effect is opposite for top and antitop which can be explained by looking at the spin correlation plots. Here the bbar that is produced with the top is "antiboosted" while the b produced with the antitop is boosted.
Added:
>
>

4. Cuts

My first set of plots is produced with the ATLAS Cuts from the ATLAS CSC note ("Prospect for single top cross -section measurement in ATLAS"), can also be found on the WhiteBoard . The Pt cuts on the jets are the following: 30 GeV on two jets and if there is an additional jet it has to have at least 15 GeV. One b-tagged jet with 30 GeV required, if there is a second b-tagged jet it is not required that it has 30 GeV, but it has to have at least 15 GeV (minimum required energies for all jets). If you look at the b-jet pt-distributions after cuts you see that they are zero up to 15 GeV, then there is a small contribution from the cases where the b-tagged jet is the third jet and the gluon jet is actually over the 30 GeV limit (that doesn't happen too often, so this contribution is very small). At pt>30 GeV the distribution should look the same as before cuts.

The second set of plots will have a 30 GeV cut on every jet. It will be interesting to see how the number of jets for 2-jet and 3-jets changes with the higher cut on the third jet. If we require all jets to have minimum pt of 30 GeV, the small contribution between 15 and 30 GeV in the jet-pt plots vanishes.

But even with the stricter jet cuts, the parton level distributions after cuts (which are not really experimentally relevant, but interesting to understand the event generation), do have a contribution between 0 and 30 GeV, as the jet clustering doesn't always capture the emitted gluon and combines it with the b-jet, so that the real parton in fact has a smaller pt than the one that is detected as a jet. The contribution between 0 and 30 GeV consists only of real NLO corrections, as the virtual corrections are always fully captured by the jet clustering and the tree level doesn't have a third jet. If we look at the b pt distribution of the alpha-s corrections after cuts, the sdecay contribution looks very bumpy. This can be explained by looking at the real and virtual corrections separately: the virtual corrections are negative, and cut at 30 GeV, the real corrections are always positive and only reduced under 30 GeV, but now, with the negative correction missing, getting pretty big and then falling once the virtual correction kicks in.

It is also interesting to look at the top mass reconstruction. Here, the decay correction looks very bumpy. Both real and virtual corrections shift the top mass up a bit, but again, we do not capture all the emitted gluons and thus reconstruct some of the b-quarks with too little energy, so the real correction is not shifted up as much as the virtual correction, so that it dominates at lower masses, whereas the virtual correction kicks in at higher masses, making the distribution going first up and then down.

The top pt after cuts is another "illegal" plot to look at as it is basically parton level aftercut, which we will never measure in real life. I was struck by the weird shape and the dominance of the initial corrections though. As we have a cut of 30 GeV on the bbar jet now, the top can only have a pt smaller than 30 GeV if p.ex. the bbar emits a gluon, which is not included in the jet, and they are back to back, so that the bbar appears to have a greater momentum than it actually has (this happens very seldomly, so that this contribution is very small. The other way of getting a top with a pt less than 30 GeV is if one of the quark is produced by a gluon (and an (anti) quark is emitted as third jet), so that the produced quark in fact has a pt that is nonzero (which is allowed as it has the third jet as counter part). This process boosts the top and the bbar, so it can happen that the bbar is detected with a momentum of 30 GeV, because of the boost, but the top (goes into the other direction and therefore) has a smaller pt.
 

7. Cross section for top mass 175 GeV and 5 mio produced events:


- used makeXSTable() in measureEfficiencies.C
- input: "schanCtq6.6/lhc_top_loose_04_5mio.root"
Line: 203 to 219
 

Interestingly my cross sections seem to rise with a rising scaling factor, whereas for Tevatron setting the cross sections fall with rising scaling factor.
Added:
>
>

100. Outline of the paper

Let's fetz...Don't forget:
Formalities
  • page numbers
  • citations (to compare cuts, pictures, cross sections and top mass)
  • Fig.
  • W-boson
  • s-channel single top quark production


Physics
  • top - antitop
  • only parton level plots or reco after cuts (never parton after cuts!)
  • intermediate W?
  • "modified" narrow width for top quark
  • fixed value for top quark mass used

0. ABSTRACT

I. INTRODUCTION

  • single top production modes
  • top - antitop asymmetry
  • outline paper

II. CROSS SECTION (INCLUSIVE RATE)

  • absolute cross section
  • top mass dependence
  • scale dependence
  • top - antitop (ratios)

III. SINGLE TOP ACCEPTANCE STUDIES

  • list used cuts, cite ATLAS note
  • CMS cuts???
  • cone sizes
  • fig 4 => slice of lego plot jet pT threshold => measureEfficiencies...

IV. SINGLE TOP EVENT DISTRIBUTIONS

  1. Final State Object Distributions
    • fig 5 electron, neutrino ? or too much repetition?
    • fig 7 b, bbar, Ht => jet - spiel
    • top - antitop (eta distributions)

B. Event Reconstruction
    • reconstruction MET => neutrino
    • top quark reco => b jets problem => best jet => with third jet: bg jet including gluon
    • percentage best jet real b jet
    • fig 9: best jet is b jet...
    • fig 10: top peak wth best jet... top quark width comment

    • fig 11: top pt, eta at parton level and after cuts

C. Kinematical and Spin Correlations
    • fig 12: transverse momentum, diff between best, non -best
    • stuff/correlation pics from my old work?
    • b, bbar correlation
    • top polarization measurements (explain bases, helicity, optimal, beamline => careful with s-channel names)
    • fig 14: helicity basis, optimal basis => before and after cuts, explain cut effects
    • degree of polarization
    • problematic optimal basis => prescription, polarization depending on momentum of intermediate W
    • table of polarizations

D. Distributions for three-jet event
  • fig 16,17: jet 3 distributions, delta R, angular
  • How do I figure out the percentage for the third jet to be from the gluon?
  • prescription for dealing with extra jet?

V. SINGLE TOP PRODUCTION AS BACKGROUND TO SM HIGGS SEARCHES

  • fig 19, 20: invariant mass of bbar, angular distance bbar

VI. CONCLUSIONS

 

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5. Changes 2008

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5. a) Changes 2008

 

Major changes

  • new cut class: Cut_Basic_LHC.cpp with the proposed cuts in the ATLAS CSC note ("Prospect for single top measurement in ATLAS")
Line: 113 to 113
 
  • plots for eta now only from 0 to 5 range as symmetric for LHC
    (change only in root macros, the original histograms are still from -5 to 5)
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5. b) Changes 2009

  • Somehow my cut class doesn't work properly
 

6. Interesting physics found in the plots

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    • directory for logfiles
  1. in run100Mio.sh:
    • directory to store root-tuples (OUTPUTDIR)
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  1. type: submit100Mio.sh
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  1. type: submit100Mio.sh (wants new root library -opt because of h2root)
 

...make histograms

  1. my directory on the tier: /home/sheim/100Mio/NLOAnalysis
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    • directory in which you store your root-tuples
    • directory for output root files
  1. in run100MioHistos.sh
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    • still NTUPLEDIR (want to change that)
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    • still NTUPLEDIR
 
    • runme options (see above)
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  1. type: submit100MioHistos.sh (wants old root library, I don't understand that)
 
Added:
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...add histograms

  1. in /msu/data/dzero there is add.sh
  2. change FILEDIR and the filenames
  3. type "add.sh" (wants new library)
 

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  1. create output directory
  2. to run macros/s-channel/measureEfficiencies.C type analogous to above
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4. Structure of Histogram Program

>
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4. How to...on the tier

...produce events

  1. my directory on the tier: /home/sheim/100Mio/stnlo_ctq6.6_top_tier
  2. choose options in batch_gent.com (see before)
  3. in submit100Mio.sh:
    • random number seed range
    • directory for logfiles
  4. in run100Mio.sh:
    • directory to store root-tuples (OUTPUTDIR)
  5. type: submit100Mio.sh

...make histograms

  1. my directory on the tier: /home/sheim/100Mio/NLOAnalysis
  2. in submit100MioHistos.sh:
    • choose random number seed
    • directory for logfiles
    • directory in which you store your root-tuples
    • directory for output root files
  3. in run100MioHistos.sh
    • still NTUPLEDIR (want to change that)
    • runme options (see above)

 

5. Changes 2008

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  1. to run, type: ./batch_gent.com
  2. when it is done and you want root files instead of ntuples
    type: h2root inia.ntuple
Changed:
<
<

(if doesn't work with your root version try older version)
>
>

(if doesn't work: either wrong root version, or paths incorrect (look, where root, its libraries and cernlib is on the system))
 

...make histograms

  1. in runme_top.sh:
    - choose your output file
Line: 167 to 167
 
into the last bin.

2. Scale dependence

Added:
>
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I produced 500000 events with a top mass of 175 GeV and a scaling factor between 0.5 and 2 (in steps of 0.1). For this I used my script: heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/runTopScales.sh

Interestingly my cross sections seem to rise with a rising scaling factor, whereas for Tevatron setting the cross sections fall with rising scaling factor.
 

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the incoming u quark (top production) has a higher energy than the incoming down quark (antitop production).
With higher top mass this effect becomes more important.
It also has to be understood why the ratio is not 2:1=2 (2 u quarks and 1 d quark) or bigger, but significantly smaller.
Added:
>
>

With sheim/work/hx7/sarah/onetop/onetop/lhc/analysis/macros/s-channel/makeTopAntitopPlots.C
I plotted the ratio of the top/antitop cross section vs the pz of the intermediate W.
As for higher energies our calculations don't seem to work for the NLO corrections,
I plotted only until ca 2300 GeV and stuffed the rest (up to ca 7000, the produced histogram does only have this range)
into the last bin.
 

2. Scale dependence

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Minor stuff

  • plots for eta now only from 0 to 5 range as symmetric for LHC
Added:
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(change only in root macros, the original histograms are still from -5 to 5)
 

Line: 115 to 116
 
and "schanCtq6.6/lhc_antitop_loose_04_5mio.root"
=> mirrored => I divided all given numbers by 2
=> converted to pb => divided all numbers by 1000
Added:
>
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=> 10 input files (with 500000 events each) => divided all numbers by 10
=> we are only looking at the electron branch => multiply by 9 to get full cross section
 
Added:
>
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The table below is actually the data from the log file summed over the 10 input files,
multiplied by 9 (branching ratio), because I wanted more digits after the decimal point than
makeXS gave me.
 

  Top cross section [pb] Antitop cross section [pb]
Changed:
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<
tree 4.765 2.9
alpha s initial 1.23 0.78
alpha s final 0.85 0.545
alpha s decay - 0.334 0.209
alpha s sum 1.73 1.12
NLO 6.5 4.005
>
>
tree 4.2984 2.6172
NLO 5.9166 3.6261
 

8. Dependence of Cross Section on Top Mass & Scale

1. Top Mass Dependence

Line: 131 to 133
  Now I will make a table for my 500.000 event - top mass = 175 measurement (which I used to determine
the dependence of the cross section on the top mass) to calculate the difference between the two measurements.
I will shift the mass - dependence graphs by this difference as the 5 mio measurement is more precise.
Added:
>
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This table is the output of the log file (schan_51.check), multiplied by 9 (because of the branching ratio)
 

  Top cross section [pb] Antitop cross section [pb]
tree 4.2948 2.6163
Line: 139 to 142
  So we have the following offsets:

  offset Top cross section [pb] offset Antitop cross section [pb]
Changed:
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tree 0.4702 0.2837
NLO 0.5744 0.3744
>
>
tree 0.0036 0.0009
NLO -0.009 -0.0045
 

  1. I produced 500000 events with an input top mass from 168 - 182 GeV (my random number seed was 123):
    script: heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/runTopMasses.sh
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  The top is boosted stronger than the antitop as p(u) is approx. 2*p(d) due to the parton distribution function. That is why the widths are generally wider for the top than the antitop. The effect is opposite for top and antitop which can be explained by looking at the spin correlation plots. Here the bbar that is produced with the top is "antiboosted" while the b produced with the antitop is boosted.
Changed:
<
<

7. Dependence of Cross Section on Top Mass

  1. I produced 500000 events with an input top mass from 168 - 182 GeV (my random number seed was 123):
    script: heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/runTopMasses.sh
    => loops over top masses, substitutes itop1=14 and itop2=14 with numbers from 0 (=168) to 28 (=182)
    => stores the summary part (last part, cross sections for NLO and tree) of every produced schan_51.check into a textfile
  2. I used heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/plotRatio.py to plot top mass dependence on cross section
  3. plotRatio.py also calculates the ratio of top/antitop cross section for NLO and tree level and plots it vs the top mass

8. Cross section for top mass 175 GeV and 5 mio produced events:

>
>

7. Cross section for top mass 175 GeV and 5 mio produced events:

 
- used makeXSTable() in measureEfficiencies.C
- input: "schanCtq6.6/lhc_top_loose_04_5mio.root"
and "schanCtq6.6/lhc_antitop_loose_04_5mio.root"
Line: 135 to 125
 
alpha s sum 1.73 1.12
NLO 6.5 4.005
Added:
>
>

8. Dependence of Cross Section on Top Mass & Scale

1. Top Mass Dependence

Now I will make a table for my 500.000 event - top mass = 175 measurement (which I used to determine
the dependence of the cross section on the top mass) to calculate the difference between the two measurements.
I will shift the mass - dependence graphs by this difference as the 5 mio measurement is more precise.
 
Added:
>
>
  Top cross section [pb] Antitop cross section [pb]
tree 4.2948 2.6163
NLO 5.9256 3.6306

So we have the following offsets:

  offset Top cross section [pb] offset Antitop cross section [pb]
tree 0.4702 0.2837
NLO 0.5744 0.3744
 
Added:
>
>
  1. I produced 500000 events with an input top mass from 168 - 182 GeV (my random number seed was 123):
    script: heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/runTopMasses.sh
    => loops over top masses, substitutes itop1=14 and itop2=14 with numbers from 0 (=168) to 28 (=182)
    => stores the summary part (last part, cross sections for NLO and tree) of every produced schan_51.check into a textfile
  2. I used heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/plotRatio.py to plot top mass dependence on cross section
  3. plotRatio.py also calculates the ratio of top/antitop cross section for NLO and tree level and plots it vs the top mass
  4. If you use plotRatio5MioShifted.py it multiplies the cross sections by 9, according to the branching ratio and shifts the curves according to the offset (see above)
    It will also make a fit and plot only the fitted lines.
 
Added:
>
>
The ratio for the cross section top/antitop is around 1.6 and seems to be rising for higher top masses.
A possible explanation could be that the phase space for the top production is bigger as
the incoming u quark (top production) has a higher energy than the incoming down quark (antitop production).
With higher top mass this effect becomes more important.
It also has to be understood why the ratio is not 2:1=2 (2 u quarks and 1 d quark) or bigger, but significantly smaller.

2. Scale dependence

 

-- SarahHeim - 30 Oct 2008
Deleted:
<
<
 

META TOPICMOVED by="SarahHeim" date="1225480206" from="AtlasSingleTop.NLOs-channel" to="AtlasSingleTop.SchannelNLO"
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7. Dependence of Cross Section on Top Mass

Added:
>
>
  1. I produced 500000 events with an input top mass from 168 - 182 GeV (my random number seed was 123):
    script: heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/runTopMasses.sh
    => loops over top masses, substitutes itop1=14 and itop2=14 with numbers from 0 (=168) to 28 (=182)
    => stores the summary part (last part, cross sections for NLO and tree) of every produced schan_51.check into a textfile
  2. I used heim/work/hx7/sarah/onetop/stnlo_ctq6.6_top_masses/plotRatio.py to plot top mass dependence on cross section
  3. plotRatio.py also calculates the ratio of top/antitop cross section for NLO and tree level and plots it vs the top mass

8. Cross section for top mass 175 GeV and 5 mio produced events:


- used makeXSTable() in measureEfficiencies.C
- input: "schanCtq6.6/lhc_top_loose_04_5mio.root"
and "schanCtq6.6/lhc_antitop_loose_04_5mio.root"
=> mirrored => I divided all given numbers by 2
=> converted to pb => divided all numbers by 1000

  Top cross section [pb] Antitop cross section [pb]
tree 4.765 2.9
alpha s initial 1.23 0.78
alpha s final 0.85 0.545
alpha s decay - 0.334 0.209
alpha s sum 1.73 1.12
NLO 6.5 4.005

 

-- SarahHeim - 30 Oct 2008
Added:
>
>
 
META TOPICMOVED by="SarahHeim" date="1225480206" from="AtlasSingleTop.NLOs-channel" to="AtlasSingleTop.SchannelNLO"
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  • added new function to makeObjectPlots.C: makeBoostPlots()
Added:
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>
  • added new function to measureEfficiencies.C: makePolMeasurements()
 

Minor stuff

  • plots for eta now only from 0 to 5 range as symmetric for LHC
Line: 85 to 87
 

6. Interesting physics found in the plots

1. Polarization

Changed:
<
<
For pz(W intermediate)>2500 GeV we get a very high polarization
>
>
For the top quark:
For pz(W intermediate = Wint)>2500 GeV and using pz(incoming u quark >0) we get a very high polarization in the parton level, as a high pz Wint follows the direction of the incoming u quark most of the time, that is by taking pz(u quark)>0, we are guessing the right direction of the u quark, which is necessary for the Optimal basis.
The eta cut on the lepton takes away events for those high Wint energies and deforms the plot.
For the antitop:
If we still use pz(incoming u(bar) quark)>0, taking pz(Wint) < -2500 gives a high polarization, though not as high as for the top.
The eta cut cuts away events here, too and deforms the plot, though in a different way than for the top.
 

2. Init corrections to top quark rapidity

The different initial corrections for the top quark rapidity peak at different values, as they describe different physics
Line: 98 to 105
 
b/bbar from top decay 1.6 0
bbar/b 0.1 1.2
Added:
>
>
We actually get two peaks for the eta distributions: One for u coming from left and one for u coming from right. The top is boosted stronger than the antitop as p(u) is approx. 2*p(d) due to the parton distribution function. That is why the widths are generally wider for the top than the antitop. The effect is opposite for top and antitop which can be explained by looking at the spin correlation plots. Here the bbar that is produced with the top is "antiboosted" while the b produced with the antitop is boosted.

7. Dependence of Cross Section on Top Mass

 

-- SarahHeim - 30 Oct 2008
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NLO s-channel studies

>
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NLO s-channel studies

 

Changed:
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1. Basic Info

>
>

1. Basic Info

 

Used generator: ONETOP CTQ 6.6
Histograms can be found at http://hep.pa.msu.edu/people/sheim.
Changed:
<
<

2. NLO corrections

>
>

2. NLO corrections

 

NPART directory name name description
20 tree Born level LO
Line: 24 to 24
 
29 inite real initial state corrections u quark comes from gluon from left and dbar from right
30 decay real decay corrections gluon radiated from top decay process
Changed:
<
<

3. How to...

>
>

3. How to...

 

...produce events

  1. in batch_gent.com:
    - choose how many events you want to produce (recommendation: not more than 500.000 a time because of crash risk)
Line: 52 to 52
 
  1. create output directory
  2. to run macros/s-channel/measureEfficiencies.C type analogous to above
Changed:
<
<

4. Structure of Histogram Program

>
>

4. Structure of Histogram Program

 
Changed:
<
<

5. Changes 2008

>
>

5. Changes 2008

 

Major changes

  • new cut class: Cut_Basic_LHC.cpp with the proposed cuts in the ATLAS CSC note ("Prospect for single top measurement in ATLAS")
Line: 83 to 83
 

Changed:
<
<

6. Interesting physics found in the plots

>
>

6. Interesting physics found in the plots

1. Polarization

For pz(W intermediate)>2500 GeV we get a very high polarization

2. Init corrections to top quark rapidity

The different initial corrections for the top quark rapidity peak at different values, as they describe different physics

3. Width/shape of beta and bbareta for top/antitop

The more a particle is boosted in z direction the wider is its eta distribution.
Below are estimates of the widths of the tree level eta distributions

  top antitop
b/bbar from top decay 1.6 0
bbar/b 0.1 1.2
 

-- SarahHeim - 30 Oct 2008
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Added:
>
>

1. Basic Info

  Used generator: ONETOP CTQ 6.6
Changed:
<
<
Histograms can be found at http://hep.pa.msu.edu/people/sheim.
>
>

Histograms can be found at http://hep.pa.msu.edu/people/sheim.

2. NLO corrections

 

NPART directory name name description
20 tree Born level LO
Line: 18 to 24
 
29 inite real initial state corrections u quark comes from gluon from left and dbar from right
30 decay real decay corrections gluon radiated from top decay process
Added:
>
>

3. How to...

...produce events

  1. in batch_gent.com:
    - choose how many events you want to produce (recommendation: not more than 500.000 a time because of crash risk)
    - change random number seed
    - choose top/ antitop
    - choose s-/t-channel (recommendation: s-channel, as it is much cooler)
  2. to run, type: ./batch_gent.com
  3. when it is done and you want root files instead of ntuples
    type: h2root inia.ntuple
    (if doesn't work with your root version try older version)

...make histograms

  1. in runme_top.sh:
    - choose your output file
    - several options for running: can be found in driver and nloanalysis
    - -lofile $NTUPLEDIR/stre.root makes it possible to run over one file only
  2. to run, type: runme_top.sh

...make pretty graphs

  1. create output directory
  2. in macros/s-channel/makeObjectPlots.C:
    - change name of input file, output directory
    - choose gif/eps option
    - compare numbers of folders in your root file with those in macro, change, if necessary
  3. to run, type: root, .L makeObjectPlots.C, makeAllPlots() or whichever plots you want to make

...get cross section measurements etc.

  1. create output directory
  2. to run macros/s-channel/measureEfficiencies.C type analogous to above

4. Structure of Histogram Program

5. Changes 2008

Major changes

  • new cut class: Cut_Basic_LHC.cpp with the proposed cuts in the ATLAS CSC note ("Prospect for single top measurement in ATLAS")

  • option for event mirroring: GetNextMirrorEvent() and readMirrorEvent() in Particles.cpp and included in nloanalysis.cpp in the loop.
    It takes every event a second time with -px and -pz, to enforce LHC symmetry.
    Careful: You will have to divide the cross section by two!
    for using it, just add -mirror in runme_top.sh

  • ONETOP update: two more initial corrections for the LHC
    now: inita, initb, initc, initd, inite
    furthermore change of numbering of corrections (see table above)
    => change in Particles.hpp, myTH1F, myTH2F

  • -applybtag in runme_top.sh seriously screws up weights

  • added new Histogramming class: Histogramming_Boost to look at eta and polarization distributions
    for two cases:
    pz(W intermediate) > 0 and pz(W intermediate) < 0

  • added new function to makeObjectPlots.C: makeBoostPlots()

Minor stuff

  • plots for eta now only from 0 to 5 range as symmetric for LHC

6. Interesting physics found in the plots

  -- SarahHeim - 30 Oct 2008
Added:
>
>

META TOPICMOVED by="SarahHeim" date="1225480206" from="AtlasSingleTop.NLOs-channel" to="AtlasSingleTop.SchannelNLO"
 
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