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[FIXED] Not set McMotherIdx [message #14754]

Tue, 14 May 2013 18:13

Andreas Pitka
Messages: 38
Registered: November 2011
Location: Gießen

continuous participant

From: *physik.uni-giessen.de

Hi,

the McMotherIdx`s seem not to be set in general (they are always -1).

I was using the apr13 release.

Best regards

Andreas

[Updated on: Thu, 04 July 2013 13:48] by Moderator

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Re: Not set McMotherIdx [message #14755 is a reply to message #14754]

Tue, 14 May 2013 18:25

StefanoSpataro
Messages: 2736
Registered: June 2005
Location: Torino

first-grade participant

From: *to.infn.it

Which class and which task?

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Re: Not set McMotherIdx [message #14756 is a reply to message #14755]

Tue, 14 May 2013 20:00

Andreas Pitka
Messages: 38
Registered: November 2011
Location: Gießen

continuous participant

From: *physik.uni-giessen.de

I was using the PndEvtGenDirect with evtGen->SetStoreTree(kTRUE).

Its reproducable via:

theAnalysis->FillList(MC_Truth,"McTruth");

for (int j=0;j<MC_Truth.GetLength();j++)  
    cout<<MC_Truth[j].GetMcMotherIdx()<<endl;

It would be nice if its set, since PndMcTruthMatch uses the MotherIdx a lot. Smile

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Re: Not set McMotherIdx [message #14757 is a reply to message #14756]

Wed, 15 May 2013 09:00

Ralf Kliemt
Messages: 507
Registered: May 2007
Location: GSI, Darmstadt

first-grade participant

From: *pool.mediaWays.net

Hi Andreas,

A MC truth candidate has by concept mother and daughters. The MC mother index points to the MC candidate of the current mother. But your MC tracks don't have a MC truth as they already are the MC truth.
In other words: Don't use the MCmatch on the truth list but on a reconstructed candidate list.

Cheers.
Ralf

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Re: Not set McMotherIdx [message #14758 is a reply to message #14757]

Wed, 15 May 2013 10:26

Andreas Pitka
Messages: 38
Registered: November 2011
Location: Gießen

continuous participant

From: *physik.uni-giessen.de

PndMcTruthMatch is doing something like the following

00075     // check whether the mothers of all daughters are the same
00076     for ( Int_t i=1; i<nd; ++i ) {
00077       Int_t dauidx = c.Daughter ( i )->GetMcIdx();
00078 
00079       if ( mct[dauidx].GetMcMotherIdx() != mothidx ) {
00080         if(verbose) Info("PndMcTruthMatch::MctMatch","rejected by not matching mother ids in daughters");
00081         return false;
00082       }
00083     }

where mct is the Monte Carlo RhoCandList. Without the MotherIdx set for the particles in the McTruth RhoCandList the PndMcTruthMatch is totally useless, since "Bool_t PndMcTruthMatch::MctMatch ( RhoCandidate& c, RhoCandList& mct, Int_t level, bool verbose )"
returns false all the time.

The problem is not getting the McTruth for a final state particle, but knowing for example if a D0 candidate is made of the tracks belonging to the Monte Carlo Daughters.

[Updated on: Wed, 15 May 2013 10:26]

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Re: Not set McMotherIdx [message #14928 is a reply to message #14754]

Thu, 04 July 2013 13:25

Ralf Kliemt
Messages: 507
Registered: May 2007
Location: GSI, Darmstadt

first-grade participant

From: *gsi.de

Hi.
Issue is fixed within the changes after the apr13 release. The whole MC tree is built, if the information is stored during simulation.

Ralf

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