CompHEP Zjj events (2->4 and 2->3 matrix elements)

There are two kinds of CompHEP events for the Zjj production:
p,P->Z, j, j -> e , e-, j, j
full matrix element 2 -> 4 with correct angular distributions for
the final particles and
p,P->Z, j, j in the last case Z decays in Pythia and such events
could be useful for the comparison with correct one (the first).
It is possible to extrapolate such a result to the Z3j and Z4j processes,
where it is much more difficult to simulate the correct final state angular distributions.


Parameters of generation:
SQRT(S) 1.960000E 03 GeV
StrFun1: PDF:CTEQ5L(proton)
StrFun2: PDF:CTEQ5L(anti-proton)
QCD scale Q = 40 GeV
Such choice of the scale is based on the paper
hep-ph/0202176 (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
(see distribution in the Zbb paper, here).


These events are available in enstore system
(e.g. fsgi03.fnal.gov): /pnfs/patriot/Z_jets/Zjj/
104Mb Zjj_2-3.pev - 2->3 events
70Mb Zjj_eejj_2-4.pev - 2->4 events
mixed and randomized events in native format for the CompHEP-Pythia interface

In the Zjj_eejj_2-4.pev file there events for the 58 subprocesses:

Upper letters means antiparticles
E1 - positron
e1 - electron
n1 - electron neutrino
G - gluon

PROCESS u c -> e1 E1 u c Cross_section 2.789152E-02
PROCESS u C -> e1 E1 u C Cross_section 3.169137E-02
PROCESS u S -> e1 E1 u S Cross_section 6.081341E-02
PROCESS u s -> e1 E1 u s Cross_section 6.708867E-02
PROCESS U u -> G G e1 E1 Cross_section 1.268987E-01
PROCESS U U -> e1 E1 U U Cross_section 7.836305E-02
PROCESS U D -> e1 E1 U D Cross_section 4.302338E-02
PROCESS U G -> G e1 E1 U Cross_section 2.394777E-01
PROCESS d u -> e1 E1 u d Cross_section 4.296785E-02
PROCESS d U -> e1 E1 U d Cross_section 4.003188E-01
PROCESS u u -> e1 E1 u u Cross_section 7.844769E-02
PROCESS d d -> e1 E1 d d Cross_section 4.977899E-02
PROCESS d D -> e1 E1 u U Cross_section 6.705447E-02
PROCESS d D -> e1 E1 d D Cross_section 3.029091E-01
PROCESS d D -> G G e1 E1 Cross_section 2.661355E 00
PROCESS d D -> e1 E1 c C Cross_section 6.586058E-02
PROCESS d D -> e1 E1 s S Cross_section 6.749941E-02
PROCESS d G -> G e1 E1 d Cross_section 1.589407E 00
PROCESS d c -> e1 E1 d c Cross_section 1.449193E-02
PROCESS d C -> e1 E1 d C Cross_section 1.297025E-02
PROCESS D U -> e1 E1 U D Cross_section 1.252209E-01
PROCESS u U -> e1 E1 u U Cross_section 1.014624E 00
PROCESS D d -> G G e1 E1 Cross_section 2.592708E-01
PROCESS D d -> e1 E1 c C Cross_section 6.754095E-03
PROCESS D D -> e1 E1 D D Cross_section 4.971955E-02
PROCESS D G -> G e1 E1 D Cross_section 3.521941E-01
PROCESS D c -> e1 E1 D c Cross_section 2.520553E-03
PROCESS D C -> e1 E1 D C Cross_section 2.875713E-03
PROCESS G u -> G e1 E1 u Cross_section 2.375979E-01
PROCESS G U -> G e1 E1 U Cross_section 3.127872E 00
PROCESS G d -> G e1 E1 d Cross_section 3.519565E-01
PROCESS G D -> G e1 E1 D Cross_section 1.590083E 00
PROCESS u U -> e1 E1 d D Cross_section 1.733319E-01
PROCESS G G -> e1 E1 u U Cross_section 8.191455E-02
PROCESS G G -> e1 E1 d D Cross_section 9.007012E-02
PROCESS G G -> e1 E1 c C Cross_section 8.149311E-02
PROCESS G G -> e1 E1 s S Cross_section 9.011758E-02
PROCESS G c -> G e1 E1 c Cross_section 7.508045E-02
PROCESS G C -> G e1 E1 C Cross_section 7.509133E-02
PROCESS G S -> G e1 E1 S Cross_section 1.815735E-01
PROCESS G s -> G e1 E1 s Cross_section 1.809573E-01
PROCESS c U -> e1 E1 U c Cross_section 3.169944E-02
PROCESS c D -> e1 E1 D c Cross_section 1.304141E-02
PROCESS u U -> G G e1 E1 Cross_section 7.131601E 00
PROCESS c G -> G e1 E1 c Cross_section 7.471195E-02
PROCESS c C -> G G e1 E1 Cross_section 1.374567E-02
PROCESS C U -> e1 E1 U C Cross_section 2.826354E-02
PROCESS C D -> e1 E1 D C Cross_section 1.448700E-02
PROCESS C G -> G e1 E1 C Cross_section 7.516142E-02
PROCESS S G -> G e1 E1 S Cross_section 1.805316E-01
PROCESS S s -> G G e1 E1 Cross_section 7.313263E-02
PROCESS s G -> G e1 E1 s Cross_section 1.809477E-01
PROCESS s S -> G G e1 E1 Cross_section 7.256796E-02
PROCESS u U -> e1 E1 c C Cross_section 1.723341E-01
PROCESS u U -> e1 E1 s S Cross_section 1.742980E-01
PROCESS u d -> e1 E1 u d Cross_section 1.240307E-01
PROCESS u D -> e1 E1 u D Cross_section 4.022843E-01
PROCESS u G -> G e1 E1 u Cross_section 3.127826E 00
Number_of_subprocesses = 58
Total_cross_section_(pb) = 2.606929E 01
Events_mixed_and_randomized = 255487

The list of subprocesses for the 2->3 calculations is on the next page.

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