CompHEP p,P->Z, b, b -> e , e-, b, b events

 
There are CompHEP events for the process:
p,P->Z, b, b -> e , e-, b, b
full matrix element 2 -> 4 with correct angular distributions for
the final particles.

There are 3 subprocesses:
PROCESS u U -> e1 E1 b B Cross_section 1.891219E-01
PROCESS d D -> e1 E1 b B Cross_section 7.636867E-02
PROCESS G G -> e1 E1 b B Cross_section 1.218178E-01

Total_cross_section_(pb) = 3.873084E-01
Events_mixed_and_randomized = 307094


Parameters of generation:
SQRT(S) 1.960000E 03 GeV
StrFun1: PDF:CTEQ5L(proton)
StrFun2: PDF:CTEQ5L(anti-proton)
QCD scale Q = 20 GeV
Such choice of the scale is based on the paper
hep-ph/0006304 (Figure 5)

Cuts:
Pt(b1) > 10 GeV
Pt(b2) > 10 GeV
DeltaR(b1,b2) > 0.5
60 GeV< M_e e-<120 GeV ( 60<(p_e1 p_E1)**2<120 )

The last cut needs to avoid the virtual gamma pole at 0 mass.


These events are available in enstore system
(e.g. fsgi03.fnal.gov): /pnfs/patriot/Z_jets/Zbb/

52K Mar 12 17:36 m_enu.ps - parton level distribution of M_e e- (before the cut to this variable)
1.8K Mar 12 17:36 prt_2 - protocol of the CompHEP calculations
1.8K Mar 12 17:36 prt_3 - protocol of the CompHEP calculations
2.0K Mar 12 17:36 prt_4 - protocol of the CompHEP calculations
83M Mar 12 17:36 zbb_2-4.ev - mixed and randomized events in native format
for the CompHEP-Pythia interface




Lev V. Dudko e-mail:dudko@fnal.gov
t. 1(630)8408233 http://lev.art.ru
Related papers: