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//--------------------------------------------------------------------------------------------------
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// $Id: StableParticle.h,v 1.11 2009/03/18 15:44:32 loizides Exp $
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//
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// StableParticle
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//
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// Generic stable particle with track. Stores absolute pdg code and link to track.
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//
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// Authors: C.Loizides, J.Bendavid
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//--------------------------------------------------------------------------------------------------
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#ifndef MITANA_DATATREE_STABLEPARTICLE_H
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#define MITANA_DATATREE_STABLEPARTICLE_H
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#include "MitAna/DataTree/interface/ChargedParticle.h"
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namespace mithep
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{
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class StableParticle : public ChargedParticle
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{
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public:
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StableParticle() : fAbsPdgId(0) {}
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StableParticle(UInt_t absPdgId) : fAbsPdgId(absPdgId) {}
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StableParticle(UInt_t absPdgId, const Track *track) : fAbsPdgId(absPdgId), fTrackRef(track) {}
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UInt_t AbsPdgId() const { return fAbsPdgId; }
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const Track *Trk() const { return fTrackRef.Obj(); }
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const Track *TrackerTrk() const { return Trk(); }
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EObjType ObjType() const { return kStableParticle; }
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TParticlePDG *PdgEntry() const;
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void SetAbsPdgId(UInt_t apdg) { fAbsPdgId=apdg; ClearMom(); }
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void SetTrk(const Track *t) { fTrackRef = t; ClearMom(); ClearCharge(); }
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protected:
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Double_t GetMass() const;
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UInt_t fAbsPdgId; //pdg identifier (absolute value)
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Ref<Track> fTrackRef; //tracker track reference
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ClassDef(StableParticle, 1) // Stable particle class
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};
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}
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//--------------------------------------------------------------------------------------------------
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inline Double_t mithep::StableParticle::GetMass() const
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{
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// Get mass from pdg lookup.
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TParticlePDG *pdgEntry = PdgEntry();
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if (pdgEntry)
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return pdgEntry->Mass();
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else {
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Error("GetMass",
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"Absolute pdg code %i not found in table, returning mass=-99.0 GeV", fAbsPdgId);
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return -99.0;
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}
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}
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#endif
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