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AnalysisTop new Feature truth tchannel singletop Parton chain

Jordy Degens requested to merge jdegens/athena:21.2-truth_tchannel_singletop into 21.2

Implemented a Parton truth chain for t-channel single top events. it stores the four momenta of the top quark, the decaying b quark, the W boson and its two decay products. Additionally it stores the four momenta, particle ID and statuscode of the highest PT light quark not originating from a top quark decay.

It adds one new class calculating these variables:

PhysicsAnalysis/TopPhys/xAOD/TopPartons/Root/CalcTChannelSingleTopPartonHistory.cxx PhysicsAnalysis/TopPhys/xAOD/TopPartons/TopPartons/CalcTChannelSingleTopPartonHistory.h

I added an initialization function of the variables stored by this class in:

PhysicsAnalysis/TopPhys/xAOD/TopPartons/Root/PartonHistory.cxx PhysicsAnalysis/TopPhys/xAOD/TopPartons/TopPartons/PartonHistory.h

For the config file I changed:

PhysicsAnalysis/TopPhys/xAOD/TopAnalysis/util/top-xaod.cxx

adding the option tchannel. which has to be set in the config file by:

TopPartonHistory tchannel

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