Computation of resummed diphoton production cross sections 
for the Tevatron Run-2

References:
1. C. Balazs, E. Berger, P. Nadolsky, and C.-P. Yuan, 
   Phys. Lett. B637:235 (2006);
2. P. Nadolsky, C. Balazs, E. Berger, and C.-P. Yuan, hep-ph/0702003.

Contents
diphoton_grids_tev2.tar.gz    -- subdirectory with input grids
diphoton_ins_tev2.tar.gz      -- subdirectory with resbos.in template files

matching_scripts/
book_ntuple_tev_cdf_public.bat  
and book_ntuple_tev_d0_public.bat -- UNIX shell scripts for automated 
                                     computation and matching of resummed 
                                     cross sections assuming CDF-like and
                                     D0-like isolation parameters

To compute matched resummed cross sections in the form of PAW ntuples,
compile the ResBos code with 'make' and execute one of the above shell
scripts. The parameter values are specified in the header of the script.
The script automatically updates the resbos.in file and runs ResBos 
several times to produce ntuples for qqbar+qg, gg+gq, and all channels. 
You will need to create subdirectories grids/ and ins/ with input grids 
and resbos.in templates beforehand. The returned files are called

res321_aa_tev2_ct6m.hbook  -- the NNLL/NLO resummed cross section for the 
                             qqbar+qg channel
res321_ag_tev2_ct6m.hbook  -- the NNLL/NLO resummed cross section for the 
                             gg+gq channel
res321_all_tev2_ct6m.hbook -- the resummed cross section for all 
                             (qqbar+qg+gg+gq) channels, i.e., the final output
                             that can be compared to the data

The input cross section grids are computed along the lines described 
in Refs. [1] and [2]. The CTEQ6M PDF's [J. Pumplin et al., 
JHEP 0207, 012 (2002)] and nonperturbative Sudakov function obtained in
A. Konychev, P. Nadolsky, Phys. Lett. B633, 710 (2006) were used.
The final-state fragmentation singularity arising in qg direct channel is
regularized using a combination of quasi-experimental isolation and Catani-
Seymour subtraction described in Ref. [2] and corresponding to the parameter
isub=12 in book_ntuple_tev2_public.bat. An alternative regularization by
quasi-experimental isolation and smooth-cone subtraction (introduced in 
Ref. [1]) may be turned on by choosing isub=-2.

Standalone utilities for adding the distributions in the format of 
GBOOKs, PAW HBOOKs/Ntuples, or ROOT Ntuples are available in tools/.