/*
$Log$
+Revision 1.23 2002/05/06 07:17:29 morsch
+Pyr gives random number r in interval 0 < r < 1.
+
+Revision 1.22 2002/04/26 10:28:48 morsch
+Option kPyBeautyPbMNR added (N. Carrer).
+
+Revision 1.21 2002/03/25 14:46:16 morsch
+Case kPyD0PbMNR added (N. Carrer).
+
+Revision 1.20 2002/03/03 13:48:50 morsch
+Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
+NLO calculations (Nicola Carrer).
+
+Revision 1.19 2002/02/20 08:52:20 morsch
+Correct documentation of SetNuclei method.
+
+Revision 1.18 2002/02/07 10:43:06 morsch
+Tuned pp-min.bias settings (M.Monteno, R.Ugoccioni and N.Carrer)
+
+Revision 1.17 2001/12/19 15:40:43 morsch
+For kPyJets enforce simple jet topology, i.e no initial or final state
+gluon radiation and no primordial pT.
+
+Revision 1.16 2001/10/12 11:13:59 morsch
+Missing break statements added (thanks to Nicola Carrer)
+
+Revision 1.15 2001/03/27 10:54:50 morsch
+Add ResetDecayTable() and SsetDecayTable() methods.
+
Revision 1.14 2001/03/09 13:03:40 morsch
Process_t and Struc_Func_t moved to AliPythia.h
// heavy quark masses
SetPMAS(4,1,1.2);
-
+ SetMSTU(16,2);
//
// primordial pT
SetMSTP(91,1);
case kPyBeauty:
SetMSEL(5);
SetPMAS(5,1,4.75);
+ SetMSTU(16,2);
break;
case kPyJpsi:
SetMSEL(0);
SetMSUB(88,1);
// gg-> chi_2c g
SetMSUB(89,1);
+ break;
case kPyCharmUnforced:
SetMSEL(0);
// gq->qg
SetMSUB(53,1);
// gg->gg
SetMSUB(68,1);
+ break;
case kPyBeautyUnforced:
SetMSEL(0);
// gq->qg
case kPyMb:
// Minimum Bias pp-Collisions
//
-// Tuning of parameters descibed in G. Ciapetti and A. Di Ciaccio
-// Proc. of the LHC Workshop, Aachen 1990, Vol. II p. 155
//
// select Pythia min. bias model
SetMSEL(0);
- SetMSUB(92,1);
- SetMSUB(93,1);
- SetMSUB(94,1);
- SetMSUB(95,1);
-// Multiple interactions switched on
- SetMSTP(81,1);
- SetMSTP(82,1);
-// Low-pT cut-off for hard scattering
- SetPARP(81,1.9);
-// model for subsequent non-hardest interaction
-// 90% gg->gg 10% gg->qq
- SetPARP(86,0.9);
-// 90% of gluon interactions have minimum string length
- SetPARP(85,0.9);
+ SetMSUB(92,1); // single diffraction AB-->XB
+ SetMSUB(93,1); // single diffraction AB-->AX
+ SetMSUB(94,1); // double diffraction
+ SetMSUB(95,1); // low pt production
+ SetMSTP(81,1); // multiple interactions switched on
+ SetMSTP(82,3); // model with varying impact param. & a single Gaussian
+ SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
+ // multiple interaction at a reference energy = 14000 GeV
+ SetPARP(89,14000.); // reference energy for the above parameter
+ SetPARP(90,0.174); // set exponent for energy dependence of pT_0
+ case kPyMbNonDiffr:
+// Minimum Bias pp-Collisions
+//
+//
+// select Pythia min. bias model
+ SetMSEL(0);
+ SetMSUB(95,1); // low pt production
+ SetMSTP(81,1); // multiple interactions switched on
+ SetMSTP(82,3); // model with varying impact param. & a single Gaussian
+ SetPARP(82,3.47); // set value pT_0 for turn-off of the cross section of
+ // multiple interaction at a reference energy = 14000 GeV
+ SetPARP(89,14000.); // reference energy for the above parameter
+ SetPARP(90,0.174); // set exponent for energy dependence of pT_0
+
break;
case kPyJets:
SetMSEL(1);
+// no initial state radiation
+ SetMSTP(61,0);
+// no final state radiation
+ SetMSTP(71,0);
+// no primordial pT
+ SetMSTP(91,0);
+// SetMSTP(111,0);
+ SetMSTU(16,1);
+ SetMSTJ(1,1);
+
break;
case kPyDirectGamma:
SetMSEL(10);
break;
+ case kPyCharmPbMNR:
+ case kPyD0PbMNR:
+ // Tuning of Pythia parameters aimed to get a resonable agreement
+ // between with the NLO calculation by Mangano, Nason, Ridolfi for the
+ // c-cbar single inclusive and double differential distributions.
+ // This parameter settings are meant to work with Pb-Pb collisions
+ // (AliGenPythia::SetNuclei) and with kCTEQ_4L PDFs.
+ // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
+ // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
+
+ // All QCD processes
+ SetMSEL(1);
+
+ // No multiple interactions
+ SetMSTP(81,0);
+ SetPARP(81,0.0);
+ SetPARP(82,0.0);
+
+ // Initial/final parton shower on (Pythia default)
+ SetMSTP(61,1);
+ SetMSTP(71,1);
+
+ // 2nd order alpha_s
+ SetMSTP(2,2);
+
+ // QCD scales
+ SetMSTP(32,2);
+ SetPARP(34,1.0);
+
+ // Intrinsic <kT^2>
+ SetMSTP(91,1);
+ SetPARP(91,1.304);
+ SetPARP(93,6.52);
+
+ // Set c-quark mass
+ SetPMAS(4,1,1.2);
+
+ break;
+ case kPyBeautyPbMNR:
+ // Tuning of Pythia parameters aimed to get a resonable agreement
+ // between with the NLO calculation by Mangano, Nason, Ridolfi for the
+ // b-bbar single inclusive and double differential distributions.
+ // This parameter settings are meant to work with Pb-Pb collisions
+ // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
+ // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
+ // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
+
+ // All QCD processes
+ SetMSEL(1);
+
+ // No multiple interactions
+ SetMSTP(81,0);
+ SetPARP(81,0.0);
+ SetPARP(82,0.0);
+
+ // Initial/final parton shower on (Pythia default)
+ SetMSTP(61,1);
+ SetMSTP(71,1);
+
+ // 2nd order alpha_s
+ SetMSTP(2,2);
+
+ // QCD scales
+ SetMSTP(32,2);
+ SetPARP(34,1.0);
+ SetPARP(67,1.0);
+ SetPARP(71,1.0);
+
+ // Intrinsic <kT^2>
+ SetMSTP(91,1);
+ SetPARP(91,2.035);
+ SetPARP(93,10.17);
+
+ // Set b-quark mass
+ SetPMAS(5,1,4.75);
+
+ break;
}
//
// Initialize PYTHIA
- SetMSTP(41,1);
+ SetMSTP(41,1); // all resonance decays switched on
Initialize("CMS","p","p",fEcms);
// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
// =1: internal PYTHIA acording to MSTP(51)
// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
-// =3: PDFLIB proton s.f. with nuclar correction:
-// MSTP( 51) = 1000xNPGROUP+NPSET
-// MSTP(151) = 1000xNAGROUP+NASET
+// If the following mass number both not equal zero, nuclear corrections of the stf are used.
// MSTP(192) : Mass number of nucleus side 1
// MSTP(193) : Mass number of nucleus side 2
-
- SetMSTP(52,3);
- SetMSTP(191, 1001);
+ SetMSTP(52,2);
SetMSTP(192, a1);
SetMSTP(193, a2);
}
#endif
extern "C" {
- Double_t pyr(Int_t*) {return sRandom->Rndm();}
+ Double_t pyr(Int_t*)
+{
+ Float_t r;
+ do r=sRandom->Rndm(); while(0 >= r || r >= 1);
+ return r;
+}
void pyrset(Int_t*,Int_t*) {}
void pyrget(Int_t*,Int_t*) {}
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff