Difference: PolarizationMadevent (1 vs. 47)

Revision 47
Changes from r45 to r47
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 123 to 123
 

madeventschannel2000.jpg
Added:
>
>

5. Madevent approximations

For an incoming beam of 200 GeV and a minimum PT of 100 GeV for the bottom quark, we get D = 0.90 +/- 0.02. So it can be assumed that Madevent doesn't give the expected 100 % polarization because it makes approximations while producing events (e.g. the bottom quark being massless).
 

5. References

1. The madgraph website: http://madgraph.hep.uiuc.edu/
Revision 45
Changes from r43 to r45
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 115 to 115
  We get:

energy of incoming partons (GeV) degree of polarization
Changed:
<
<
200 0.73
500 0.93
2000 0.99
>
>
200 0.73 +/- 0.02
500 0.93 +/- 0.02
2000 0.99 +/- 0.02
 

Histogram for 2000 GeV partons:
Line: 125 to 125
 

5. References

Changed:
<
<
The madgraph website: http://madgraph.hep.uiuc.edu/
"Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke (see attachment)
>
>
1. The madgraph website: http://madgraph.hep.uiuc.edu/
2. "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke (see attachment)
 


-- SarahHeim - 07 May 2008
Revision 43
Changes from r41 to r43
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 127 to 127
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
"Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke (see attachment)
Changed:
<
<

-- SarahHeim - 08 Apr 2008
>
>


-- SarahHeim - 07 May 2008
 

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207699556" name="HEP9611367.pdf" path="HEP9611367.pdf" size="199441" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1210197542" name="madeventschannel2000.jpg" path="madeventschannel2000.jpg" size="22659" user="Main.SarahHeim" version="1"
Revision 41
Changes from r39 to r41
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 109 to 109
 

4. Why don't we see the full polarization?

Changed:
<
<
The problem is that madevent uses approximations, e.g. the masses of the light quarks are assumed to be zero. The higher the energy, the better are the approximations.
>
>
The problem is that Madevent uses approximations, e.g. the masses of the light quarks are assumed to be zero. The higher the energy, the better are the approximations.
 
So if we don't use pdfs but the partons themselves and change the energies of the incoming beam we can see this effect.

We get:
Changed:
<
<
energy of incoming partons (GeV) degree of polarization
>
>

energy of incoming partons (GeV) degree of polarization
 
200 0.73
500 0.93
2000 0.99
Added:
>
>
Histogram for 2000 GeV partons:

madeventschannel2000.jpg
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
Revision 39
Changes from r37 to r39
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 15 to 15
  First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then they write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen parallel to the direction of the d quark.
Thus we expect the top quarks produced in the s-channel to be 100% polarized.
Changed:
<
<

3. Madevent

>
>

3. ONETOP result

This is the polarization distribution of a sample generated by the ONETOP generator with tevatron setting. Here the expected 100% polarization can be seen.

schanneltevatronpaper.jpg

4. Madevent

 

1. The generated sample

MadGraph process: pp>tb~, QCD=99, QED=99, Model sm.
Chosen decay: t -> b ve e+
Line: 96 to 101
  }
Changed:
<
<

3. The Madevent result

>
>

3. The Madevent result for pp>tb~

 

In the polarization distribution we do not see the expected 100% polarization.
Added:
>
>
  schanneloptimalfit.jpg
Changed:
<
<

4. ONETOP result

This is the polarization distribution of a sample generated by the ONETOP generator with tevatron setting. Here the expected 100% polarization can be seen.
>
>

4. Why don't we see the full polarization?

The problem is that madevent uses approximations, e.g. the masses of the light quarks are assumed to be zero. The higher the energy, the better are the approximations.
So if we don't use pdfs but the partons themselves and change the energies of the incoming beam we can see this effect.

We get:
energy of incoming partons (GeV) degree of polarization
200 0.73
500 0.93
2000 0.99
 
Deleted:
<
<
schanneltevatronpaper.jpg
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
Revision 37
Changes from r35 to r37
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

0. Abstract

Changed:
<
<
The polarization distribution for a Single top s-channel sample, generated by MadEvent was analyzed. The distribution doesn't show the expected 100 % polarization, which could lead to the conclusion that MadEvent does not simulate the polarization of the Single Top s-channel quarks correctly.
>
>
The polarization distribution for a Single top s-channel sample, generated by MadEvent was analyzed. The distribution doesn't show the expected 100 % polarization, which leads to the conclusion that MadEvent does not simulate the polarization of the Single Top s-channel quarks correctly.
 

1. Single Top s-channel

Line: 12 to 12
 

2. Optimal basis, theory

Mahlon and Parke showed in their paper "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] that the spin of the top quark in Single Top s-channel production is correlated with the direction of the d-quark.
Changed:
<
<
First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen parallel to the direction of the d quark.
>
>
First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then they write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen parallel to the direction of the d quark.
 
Thus we expect the top quarks produced in the s-channel to be 100% polarized.

3. Madevent

Revision 35
Changes from r33 to r35
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Added:
>
>

0. Abstract

The polarization distribution for a Single top s-channel sample, generated by MadEvent was analyzed. The distribution doesn't show the expected 100 % polarization, which could lead to the conclusion that MadEvent does not simulate the polarization of the Single Top s-channel quarks correctly.

 

1. Single Top s-channel

s-channel.jpg

2. Optimal basis, theory

Line: 94 to 98
 

3. The Madevent result

Added:
>
>
In the polarization distribution we do not see the expected 100% polarization.
  schanneloptimalfit.jpg

4. ONETOP result

Changed:
<
<
This is the polarization distribution of a sample generated by the ONETOP generator with tevatron setting.
>
>
This is the polarization distribution of a sample generated by the ONETOP generator with tevatron setting. Here the expected 100% polarization can be seen.
 

schanneltevatronpaper.jpg
Line: 110 to 115
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207699556" name="HEP9611367.pdf" path="HEP9611367.pdf" size="199441" user="Main.SarahHeim" version="1"
Revision 33
Changes from r31 to r33
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 8 to 8
 

2. Optimal basis, theory

Mahlon and Parke showed in their paper "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] that the spin of the top quark in Single Top s-channel production is correlated with the direction of the d-quark.
Changed:
<
<
First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen
>
>
First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen parallel to the direction of the d quark.
Thus we expect the top quarks produced in the s-channel to be 100% polarized.
 

3. Madevent

1. The generated sample

Line: 109 to 108
 

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Deleted:
<
<
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207699222" name="mahlonparkepolarization.pdf" path="mahlonparkepolarization.pdf" size="199441" user="Main.SarahHeim" version="1"
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Revision 31
Changes from r29 to r31
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 104 to 104
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
Changed:
<
<
"Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke -- SarahHeim - 08 Apr 2008
>
>

"Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke (see attachment)
-- SarahHeim - 08 Apr 2008
 

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Revision 29
Changes from r27 to r29
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 109 to 109
 

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207699222" name="mahlonparkepolarization.pdf" path="mahlonparkepolarization.pdf" size="199441" user="Main.SarahHeim" version="1"
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
Deleted:
<
<
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207698409" name="mahlonparkepolarization.jpg" path="mahlonparkepolarization.jpg" size="93864" user="Main.SarahHeim" version="1"
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Deleted:
<
<
META FILEATTACHMENT attachment="mahlonparkepolarization.pdf" attr="" comment="" date="1207699221" name="mahlonparkepolarization.pdf" path="mahlonparkepolarization.pdf" size="199441" stream="mahlonparkepolarization.pdf" user="Main.SarahHeim" version="1"
Revision 27
Changes from r25 to r27
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 6 to 6
 

1. Single Top s-channel

s-channel.jpg

2. Optimal basis, theory

Changed:
<
<
Mahlon and Parke showed in their paper "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] that the spin of the top quark in Single Top s-channel production is correlated with the direction of the d-quark
>
>
Mahlon and Parke showed in their paper "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] that the spin of the top quark in Single Top s-channel production is correlated with the direction of the d-quark.

First they decompose the top quark momentum into a sum of two massless auxiliary momenta, then write down the matrix elements for a spin up top and a spin down top. They can show that one of them vanishes if the spin of the topquark is chosen
 
Deleted:
<
<
mahlonparkepolarization.jpg
 

3. Madevent

Line: 109 to 110
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207698409" name="mahlonparkepolarization.jpg" path="mahlonparkepolarization.jpg" size="93864" user="Main.SarahHeim" version="1"
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Changed:
<
<
META FILEATTACHMENT attachment="mahlonparkepolarization.jpg" attr="" comment="" date="1207698408" name="mahlonparkepolarization.jpg" path="mahlonparkepolarization.jpg" size="93864" stream="mahlonparkepolarization.jpg" user="Main.SarahHeim" version="1"
>
>
META FILEATTACHMENT attachment="mahlonparkepolarization.pdf" attr="" comment="" date="1207699221" name="mahlonparkepolarization.pdf" path="mahlonparkepolarization.pdf" size="199441" stream="mahlonparkepolarization.pdf" user="Main.SarahHeim" version="1"
Revision 25
Changes from r23 to r25
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 6 to 6
 

1. Single Top s-channel

s-channel.jpg

2. Optimal basis, theory

Added:
>
>
Mahlon and Parke showed in their paper "Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] that the spin of the top quark in Single Top s-channel production is correlated with the direction of the d-quark

mahlonparkepolarization.jpg
 

3. Madevent

1. The generated sample

MadGraph process: pp>tb~, QCD=99, QED=99, Model sm.
Line: 98 to 103
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
Added:
>
>
"Improved spin basis for Angular Correlation Studies in Single Top Quark Production at the Tevatron" [hep-ph/9611367] by Mahlon and Parke
  -- SarahHeim - 08 Apr 2008

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attachment="mahlonparkepolarization.jpg" attr="" comment="" date="1207698408" name="mahlonparkepolarization.jpg" path="mahlonparkepolarization.jpg" size="93864" stream="mahlonparkepolarization.jpg" user="Main.SarahHeim" version="1"
Revision 23
Changes from r21 to r23
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

1. Single Top s-channel

Changed:
<
<
schannel.jpg
>
>
s-channel.jpg
 

2. Optimal basis, theory

3. Madevent

1. The generated sample

Line: 92 to 92
  schanneloptimalfit.jpg

4. ONETOP result

Changed:
<
<
Here I used a sample generated by teh ONETOP generator with tevatron setting.
>
>
This is the polarization distribution of a sample generated by the ONETOP generator with tevatron setting.
 

schanneltevatronpaper.jpg
Line: 102 to 102
 

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696398" name="s-channel.jpg" path="s-channel.jpg" size="7327" user="Main.SarahHeim" version="1"
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Deleted:
<
<
META FILEATTACHMENT attachment="s-channel.jpg" attr="" comment="" date="1207696397" name="s-channel.jpg" path="s-channel.jpg" size="7327" stream="s-channel.jpg" user="Main.SarahHeim" version="1"
Revision 21
Changes from r19 to r21
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

1. Single Top s-channel

Added:
>
>
schannel.jpg
 

2. Optimal basis, theory

3. Madevent

1. The generated sample

Line: 86 to 87
  }
Changed:
<
<

3. The result

>
>

3. The Madevent result

 

schanneloptimalfit.jpg
Line: 90 to 91
 

schanneloptimalfit.jpg
Deleted:
<
<
 

4. ONETOP result

Added:
>
>
Here I used a sample generated by teh ONETOP generator with tevatron setting.
  schanneltevatronpaper.jpg
Added:
>
>
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/ -- SarahHeim - 08 Apr 2008
Line: 100 to 103
 
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attachment="s-channel.jpg" attr="" comment="" date="1207696397" name="s-channel.jpg" path="s-channel.jpg" size="7327" stream="s-channel.jpg" user="Main.SarahHeim" version="1"
Revision 19
Changes from r17 to r19
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 92 to 92
 

4. ONETOP result

Changed:
<
<
dc.jpg
>
>
schanneltevatronpaper.jpg
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/ -- SarahHeim - 08 Apr 2008

META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Added:
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696219" name="schanneltevatronpaper.jpg" path="schanneltevatronpaper.jpg" size="19418" user="Main.SarahHeim" version="1"
Revision 17
Changes from r15 to r17
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 92 to 92
 

4. ONETOP result

Added:
>
>
dc.jpg
 

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/ -- SarahHeim - 08 Apr 2008
Changed:
<
<
META FILEATTACHMENT attachment="pidschannel.jpg" attr="" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" stream="pidschannel.jpg" user="Main.SarahHeim" version="1"
>
>
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207696110" name="schanneloptimalfit.jpg" path="schanneloptimalfit.jpg" size="23817" user="Main.SarahHeim" version="1"
META FILEATTACHMENT attr="" autoattached="1" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" user="Main.SarahHeim" version="1"
Revision 15
Changes from r13 to r15
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 76 to 75
  TVector3 p = vec2.Vect(); TVector3 q = vec3.Vect(); Double_t a = p.Angle(q);
Deleted:
<
<

  Double_t b = TMath::Cos(a);

histCos->Fill(b);
Line: 88 to 86
  }
Deleted:
<
<
 

3. The result

Added:
>
>

schanneloptimalfit.jpg
 

4. ONETOP result

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
Revision 13
Changes from r11 to r13
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 30 to 30
  // Get pointers to branches used in this analysis TClonesArray *branchParticle = treeReader->UseBranch("Particle");

Deleted:
<
<

  // Book histograms TCanvas *MyC = new TCanvas("MyC","Test",1); gStyle->SetOptStat(0);
Line: 57 to 55
  if(branchParticle->GetEntries() > 0) {

// Loop
Deleted:
<
<

  for (int i=0;i<7;i++) {
Deleted:
<
<
  TRootLHEFParticle particle = (TRootLHEFParticle) branchParticle->At(i);

if(particle->PID==6){
Revision 11
Changes from r9 to r11
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 13 to 13
  pidschannel.jpg

2. The used macro

Added:
>
>
{
  // Load shared library
  gSystem->Load("../ExRootAnalysis/ExRootAnalysis/lib/libExRootAnalysis.so");
  gSystem->Load("libPhysics");

  // Create chain of root trees
  TChain chain("LHEF");
  chain.Add("pptbbar_unweighted_events.root");
  
  // Create object of class ExRootTreeReader
  ExRootTreeReader *treeReader = new ExRootTreeReader(&chain);
  Long64_t numberOfEntries = treeReader->GetEntries();
  
  // Get pointers to branches used in this analysis
  TClonesArray *branchParticle = treeReader->UseBranch("Particle");
  
 
  // Book histograms
  TCanvas *MyC = new TCanvas("MyC","Test",1);
  gStyle->SetOptStat(0);
  TH1 *histCos = new TH1F("Cos", "s-Channel: Cos(Phi), Optimal Basis", 100, -1, 1);
  
histCos->GetXaxis()->SetTitle("Cos(Phi)");
histCos->GetXaxis()->SetLabelSize(0.05);
histCos->GetYaxis()->SetLabelSize(0.05);
histCos->GetXaxis()->SetTitleSize(0.05);
histCos->SetMinimum(0);


  // Loop over all events
  for(Int_t entry = 0; entry < numberOfEntries; ++entry) {
 
 // Load selected branches with data from specified event
    treeReader->ReadEntry(entry);
    
    TLorentzVector vec1;
    TLorentzVector vec2;
    TLorentzVector vec3;
    TLorentzVector vec4;
    
    if(branchParticle->GetEntries() > 0) {
  
// Loop
   
            for (int i=0;i<7;i++) {

      TRootLHEFParticle *particle = (TRootLHEFParticle*) branchParticle->At(i);

      if(particle->PID==6){
    vec1.SetPtEtaPhiE(particle->PT, particle->Eta, particle->Phi, particle->E);
    }

      else if(particle->PID==-11){
    vec2.SetPtEtaPhiE(particle->PT, particle->Eta, particle->Phi, particle->E);
   }
      else if(particle->PID==-1){
    vec3.SetPtEtaPhiE(particle->PT, particle->Eta, particle->Phi, particle->E);
   }

   }
   
    TVector3 boost1 = -(vec1)->BoostVector();

    vec2->Boost(boost1);
    vec3->Boost(boost1);
    TVector3 p = vec2.Vect();
    TVector3 q = vec3.Vect();
    Double_t a = p.Angle(q);
  
    Double_t  b = TMath::Cos(a);
    
    histCos->Fill(b);
            }
  }

  // Show resulting histograms
    histCos->Draw();
}
 

3. The result

4. ONETOP result

Revision 9
Changes from r7 to r9
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 8 to 8
 

3. Madevent

1. The generated sample

MadGraph process: pp>tb~, QCD=99, QED=99, Model sm.
Changed:
<
<
Chosen decay: t -> b ve e+
>
>

Chosen decay: t -> b ve e+
 

pidschannel.jpg
Revision 7
Changes from r5 to r7
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"

Single Top Polarization for MadGraph s-channel sample

Line: 10 to 10
  MadGraph process: pp>tb~, QCD=99, QED=99, Model sm. Chosen decay: t -> b ve e+
Changed:
<
<
PolarizationMadeventpidschannel.jpg
>
>
pidschannel.jpg
 

2. The used macro

Revision 5
Changes from r3 to r5
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"
Changed:
<
<

Single Top Polarization for Madevent s-channel sample

>
>

Single Top Polarization for MadGraph s-channel sample

 
Changed:
<
<

1. Optimal basis, theory

2. Madevent results

3. ONETOP results

>
>

1. Single Top s-channel

2. Optimal basis, theory

3. Madevent

1. The generated sample

MadGraph process: pp>tb~, QCD=99, QED=99, Model sm. Chosen decay: t -> b ve e+

PolarizationMadeventpidschannel.jpg

2. The used macro

3. The result

4. ONETOP result

5. References

The madgraph website: http://madgraph.hep.uiuc.edu/
  -- SarahHeim - 08 Apr 2008 \ No newline at end of file
Added:
>
>
META FILEATTACHMENT attachment="pidschannel.jpg" attr="" comment="" date="1207694846" name="pidschannel.jpg" path="pidschannel.jpg" size="22049" stream="pidschannel.jpg" user="Main.SarahHeim" version="1"
Revision 3
Changes from r1 to r3
Line: 1 to 1
 
META TOPICPARENT name="SingleTopPolarization"
Added:
>
>

Single Top Polarization for Madevent s-channel sample

 
Changed:
<
<

>
>

1. Optimal basis, theory

2. Madevent results

3. ONETOP results

  -- SarahHeim - 08 Apr 2008 \ No newline at end of file
 
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