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Finding true vertex position of mother particles. [message #12101] Mon, 20 June 2011 22:49 Go to previous message
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *dip.t-dialin.net
Hi pandausers,

I'm trying to see true vertex position for psi3770 -> D+D- ->KpipiKpipi.


I have PndMCtracks and I don't have mother vertex ID.
At gridka, the signal data didn't contain mother particle info. as I correctly understand.
Simply I have only 6 charged outgoind tarcks with true 4-momentum.
From each three outgoing tracks, I can build intermediate state D+ or D- and can find first D+ or D- vertex position via.

Quote:


PndMCTrack *mctrack=(PndMCTrack*)mc_array->At(mc);
TVector3 vertex = (TVector3)mctrack->GetStartVertex();



Then now, I want to provide the vertex position for psi3770 from 4-momentum and vertex position of D+ and D-.
How can I get true vertex position only from PndMCtrack?

I assume that I need to build a TCandidate for true D+ and D-,
then I can get further mother decay.

Is there easy way to do with Rho package?

Thank you for your teaching....

Best wishes,
Donghee



[Updated on: Mon, 20 June 2011 22:52]

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