Single top: p,pbar->tqb (2-5 matrix elements)

 
The MC events for the process
p,P->t, j, b -> e, nu, b, j, b (j=g,u,d,c,s)
has been generated by CompHEP 41.10 with correct
angular distributions for the final state particles.
The contribution of the sea quarks in the initial
state has been included on the level of the Parton Structure Functions.

The subprocesses are included as follow:
Upper letters means antiparticles
E1 - positron
e1 - electron
n1 - electron neutrino
PROCESS u g(cg,Dg,Sg) -> E1 n1 d b B Cross_section 1.794807E-02
PROCESS u g(cg) -> E1 n1 s b B Cross_section 1.089361E-03
PROCESS D g(Sg) -> E1 n1 C b B Cross_section 3.847375E-04
PROCESS g u(gc,gD,gS) -> E1 n1 d b B Cross_section 7.134817E-03
PROCESS g u(gc) -> E1 n1 s b B Cross_section 2.432101E-04
PROCESS g D(gS) -> E1 n1 C b B Cross_section 6.128292E-04
PROCESS u D(uS,Dc,Sc,Du,Su,cD,cS) -> g E1 n1 b B Cross_section 2.568821E-02
PROCESS U g(Cg,dg,sg) -> e1 N1 D b B Cross_section 7.121553E-03
PROCESS U g(Cg) -> e1 N1 S b B Cross_section 2.433461E-04
PROCESS d g(sg) -> e1 N1 c b B Cross_section 6.120248E-04
PROCESS g U(gC,gd,gs) -> e1 N1 D b B Cross_section 1.795736E-02
PROCESS g U(gC) -> e1 N1 S b B Cross_section 1.083363E-03
PROCESS g d(gs) -> e1 N1 c b B Cross_section 3.846181E-04
PROCESS U d(Us,dC,sC,dU,sU,Cd,Cs) -> g e1 N1 b B Cross_section 2.581065E-02

Number_of_subprocesses = 14
Total_cross_section_(pb) = 1.063141E-01
Events_mixed_and_randomized = 411527


Parameters of generation:

SQRT(S) 1.960000E 03 geV
StrFun1: PDF:CTEQ5M1(proton)
StrFun2: PDF:CTEQ5M1(anti-proton)
QCD scale Q = 175/2 GeV
Such choice of the scale is based on the paper
hep-ph/9705398

Cuts:
Pt(j) > 10 GeV
Pt(b1 from top) > 10 GeV
Pt(b2 not from top) > 15 GeV
DeltaR(b1,b2) > 0.5
DeltaR(j,b1) > 0.5
DeltaR(j,b2) > 0.5

The cut on Pt of the b not from a top quark is based on the possible simulation of the events
at the NLO, as described in CMS Note 2000/065 for the LHC. The same way is possible at
the Tevatron.


These events and generator are available in enstore system
(e.g. fsgi03.fnal.gov): /pnfs/patriot/Top/tqb/
3.0Mb tqb_2-5_enbqb_results_linux.tar.gz - precompiled generator of events and protocols
134Mb tqb_2-5_enbqb.pev - mixed and randomized events in native format
for the CompHEP-Pythia interface



If you use these events, please refer to:

CompHEP
\bibitem{comphep}
"COMPHEP: A PACKAGE FOR EVALUATION OF FEYNMAN DIAGRAMS AND INTEGRATION
OVER MULTIPARTICLE PHASE SPACE."
By A.~Pukhov, E.~Boos, M.~Dubinin, V.~Edneral, V.~Ilyin, D.~Kovalenko, A.~Kryukov,
V.~Savrin (Moscow State U.), S.~Shichanin (Serpukhov, IHEP),
A.~Semenov (Dubna, JINR). INP-MSU-98-41-542, Aug 1999. 126pp.
User's manual for version 33. e-Print Archive: hep-ph/9908288;
E.E.~Boos, M.N.~Dubinin, V.A.~Ilyin, A.E.~Pukhov,
and V.I.~Savrin, INP MSU 94-36/358 and SNUTP-94-116, hep-ph/9503280;
P.~Baikov \textit{et al.}, in Proc.\ of the Xth Int.\ Workshop on High
Energy Physics and Quantum Field Theory, QFTHEP-95,
ed.\ by B.~Levtchenko and V.~Savrin, (Moscow, 1995), p.~101.


CompHEP-PYTHIA interface
\bibitem{comphep-pythia}
"CompHEP-PYTHIA interface: integrated package for the collision events generation based on exact matrix elements"
In the proceedings of the Seventh International Workshop on Advanced Computing and Analysis Technics in Physics Research (ACAT2000, Fermilab, October 16-20, 2000), hep-ph/0101232

Generic User Process Interface for Event Generators
\bibitem{les-houches}
"Generic User Process Interface for Event Generators"
Physics at TeV Colliders II Workshop, Les Houches, France, May 2001 14 pages, 6 figures,
hep-ph/0109068




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