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[SOLVED] GetBeam Function [message #13334]

Mon, 16 April 2012 19:31

Michael Kunkel
Messages: 53
Registered: June 2011

continuous participant

From: 129.57.114*

Greetings,

I attempted to use the GetBeam() functionality of the new update and I seem to not understand how to use it.

Here is a macro

   {
	   
    TH1F * histo1 = new TH1F ("histo1","Beam",100,1.,6);
    TH1F * histo2 = new TH1F ("histo2","GetBeam",100,1.,6);
    TH1F * histo3 = new TH1F ("histo3","Beam Reconstructed",100,1.,6);
    TH1F * histo4 = new TH1F ("histo4","e+e-",100,0.0,0.6);

//For Beam Smearing    
    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);
//For Form Factor =1 ie. QED 
   ((PDalitzDecay * )makeDistributionManager()->GetDistribution("eta_dalitz"))->SetUseQED(1);

//Set-up Reaction
    PReaction my_reaction("_P1 = 2.2","g","p","p eta [dilepton [e+ e-] g]","eta_dalitz",1,0,0,0);

//Do Histograms
    my_reaction.Do(histo1,"_x = [g,1]->E()");
    my_reaction.Do(histo2,"_x = [g+p]->GetBeam()");
    my_reaction.Do(histo3,"ene = (([p,2] + [eta]) -[p,1]) ;_x=ene->E()");
    my_reaction.Do(histo4,"mass = [e+] + [e-] ;_x=mass->M()");

//Do Reaction
    my_reaction.Print();
    my_reaction.Loop(10000);

//Draw    
    TCanvas c1; TCanvas c2; TCanvas c3; TCanvas c4;
    c1->cd();
    histo1->Draw();
    c2->cd();
    histo2->Draw();
    c3->cd();
    histo3->Draw();
    c4->cd();
    histo4->Draw();
}

What I am trying to do, it ensure that a bream photon beam is being used. Also it seems my histo3 will not return values.
Would someone tell me what I am doing incorrectly.
I am using PLUTO 5.40 with ROOT 5.30

Thanks in advance.

Michael C. Kunkel

[Updated on: Wed, 22 May 2013 12:40] by Moderator

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Re: GetBeam Function [message #13335 is a reply to message #13334]

Mon, 16 April 2012 20:26

Ingo Fröhlich
Messages: 167
Registered: March 2004

occasional visitor

From: *dip.t-dialin.net

GetBeam() returns a PParticle object, so I think you should use something like

my_reaction.Do(histo2,"_x = ([g+p]->GetBeam())->E()");

to project a scalar onto the x-axis.

ene is empty, because you use a second proton, but in the outgoing channel you have only one (I know I should throw some warning but this is not so easy for mixed channels)

--
Ingo Froehlich
IKF - University of Frankfurt
069-798-47027, FAX: -47024

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Re: GetBeam Function [message #13337 is a reply to message #13335]

Mon, 16 April 2012 21:42

Michael Kunkel
Messages: 53
Registered: June 2011

continuous participant

From: 129.57.114*

Thanks for helping me with the GetBeam, I had tried that but I used

_x = [g+p]->GetBeam()->E()

instead of

_x = ([g+p]->GetBeam())->E()

Thanks for that clarification.

As for the histo3, I understand. I had tried using

[p,1]+[eta]-([g+p]->GetTarget())

but as you stated before, this just points to the PParticle, instead I had to

   my_reaction.Do(histo3,"ene = (([p,1] + [eta])) ;_x=ene->E() - 0.938272");

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