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eta prime dalitz [message #14859] Wed, 12 June 2013 02:46 Go to previous message
Michael Kunkel is currently offline  Michael Kunkel
Messages: 53
Registered: June 2011
continuous participant
From: *hr.hr.cox.net
Greetings again,

When I attempt to run an etaPrime simulation, namely the dalitz decay of etaprime. I get error
Quote:

"Error in <PChannel::Initialization>: No database entry for:
eta' --> dilepton + g"


But if I look in PDalitzDecay.cc eta' is listed.

What our end goal is is to simulate the etaprime dalitz and also the etaprime pi+ pi- dilepton.

Also oddly enough if I try to set etaprime dalitz to QED =1
((PDalitzDecay * )makeDistributionManager()->GetDistribution("eta'_dalitz"))->SetUseQED(1);

This also produces error.
Quote:

Error: illegal pointer to class object (PDalitzDecay*)makeDistributionManager()->GetDistribution("eta'_dalitz ")


Here is a working macro. I know this works because I can replace eta' with eta and all is well.

void SIMULATE_EtaPrime_Dalitz(){
	
    double ebeam_min = 1.1725;
    double ebeam_max = 5.44575;
    PBeamSmearing *beam_smear = new PBeamSmearing("beam_smear", "Beam smearing");
    TF1* beam_smear_fn = new TF1("beam_smear_fn", "1./x", ebeam_min, ebeam_max);

    beam_smear->SetReaction("g + p");
    beam_smear->SetMomentumFunction(beam_smear_fn);
    makeDistributionManager()->Add(beam_smear);

    //((PDalitzDecay * )makeDistributionManager()->GetDistribution("eta'_dalitz"))->SetUseQED(1);

    gROOT->Reset();
    //PUtils::SetSeed(123); //this is to have a fixed SEED. By default, the systime is used....




    PReaction my_reaction("_P1 = 2.2","g","p","p eta' [dilepton [e+ e-] g]","etaP_Aphi",1,0,0,0);
    
    
    my_reaction.Loop(1500);
    
    
    
}
 
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