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518eb852 | 1 | // $Id$ |
d1e56417 | 2 | |
518eb852 | 3 | /*! |
d1e56417 | 4 | |
91509ec6 | 5 | \page README_fast Fast simulation |
518eb852 | 6 | |
7 | ||
518eb852 | 8 | The macro fastMUONGen.C allows to generate events using the |
d1e56417 | 9 | AliGenMUONCocktailpp generator. In the current implementation, the |
10 | generator is set up in order to force all generated particles to decay | |
11 | within Pythia, including the muonic decay of pions and kaons: | |
12 | gener->SetDecayModePythia(kAllMuonic); | |
13 | By changing the argument from "kAllMuonic" back to "kAll" one can | |
14 | leave it up to GEANT to do these decays. | |
15 | In addition, we require that the "trigger muons" - whose number | |
16 | (single- or dimuon trigger or MB trigger), | |
17 | specified as the third argument of fastMUONGen.C - must have their origin | |
18 | before the hadron absorber in order to "simulate" GEANT: | |
19 | gener->SetMuonOriginCut(-130.); | |
20 | ||
21 | The output of this generation ("galice.root" and "Kinematic.root") | |
518eb852 | 22 | can then be processed by the macro fastMUONSim.C that produces a |
d1e56417 | 23 | root file, called "fastSim_pp.root". It uses the "fast generator" to |
24 | simulate the detector response. The output file contains | |
25 | TClonesArrays holding AliMUONTrackLight and AliMUONPairLight objects | |
26 | that are built on the basis of the surviving muons. | |
27 | ||
28 | Both macros can be run from fastSim.sh test script. | |
29 | ||
91509ec6 | 30 | This chapter is defined in the READMEfast.txt file. |
31 | ||
518eb852 | 32 | */ |
33 | ||
d1e56417 | 34 |