[u/mrichter/AliRoot.git] / MUON / READMEfast

$Id$

How to test the fast simulation for MUON.

The macro "fastMUONGen.C" allows to generate events using the 
AliGenMUONCocktailpp generator. In the current implementation, the 
generator is set up in order to force all generated particles to decay
within Pythia, including the muonic decay of pions and kaons:
gener->SetDecayModePythia(kAllMuonic); 
By changing the argument from "kAllMuonic" back to "kAll" one can
leave it up to GEANT to do these decays. 
In addition, we require that the "trigger muons" - whose number 
(single- or dimuon trigger or MB trigger),
specified as the third argument of fastMUONGen.C - must have their origin
before the hadron absorber in order to "simulate" GEANT:
gener->SetMuonOriginCut(-130.);

The output of this generation ("galice.root" and "Kinematic.root")
can then be processed by the macro "fastMUONSim.C" that produces a
root file, called "fastSim_pp.root". It uses the "fast generator" to
simulate the detector response.  The output file contains
TClonesArrays holding AliMUONTrackLight and AliMUONPairLight objects
that are built on the basis of the surviving muons.

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