| True vertex position for secondary decay vertices [message #17737] |
Mon, 12 January 2015 21:31  |
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Dear All,
I am trying to find true vertex position for Lambda0->p pi- and Lambdabar->pbar pi+. I have four track from the simulation and used PndMCTrack to find the true vertex position of Lambda and Lambdabar particles. I am using GetStartVertex() to find the vertex of lambda from its decay particle as below.
if(mctrack->GetSecondMotherID()==1){
if (mc_pid==2212)
{
vtx_x= mctrack->GetStartVertex().X ();
vtx_y= mctrack->GetStartVertex().Y();
vtx_z= mctrack->GetStartVertex().Z();
// r = sqrt(pow(vtx_x,2)+pow(vtx_y,2));
// countT1++;
//rzp-> Fill(vtx_z,r);
// if (vtx_z< 40)
// countT2++;
}
}
Is It giving the true vertex position of Lambda or not?
If not then how I should go for it?
Thanking you
AJAY KUMAR
Research scholar
Indian Institute of Technology Indore,Indore
Madhya Pradesh
India
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| Re: True vertex position for secondary decay vertices [message #17741 is a reply to message #17738] |
Tue, 13 January 2015 12:32  |
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Dear Klaus,
Thank you for your quiick reply.
As you suggested, I have used the the daughter particles of Lambda and Lambdabar to find their real decay vertex. I have ploted Z vs R distribution for final state particles p and pi- or pbar and pi+ respectively for Lambda and Lambdabar. the distribution looks same but there is difference in entries for the decay particles. I have attached the pdf file. please have a look and suggest me if it is wrong.
Thanking you.
AJAY KUMAR
Research scholar
Indian Institute of Technology Indore,Indore
Madhya Pradesh
India
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