Draft: D*s investigate in Run2 pPb data

Jianqiao Wangrequested to merge
jianqiao/Run2_Dstars_pPb into master

Ds reconstruction with: D_s+ -> D_s+ gamma (pi0)

Photons are reconstructed from Ecal, electron pairs (LL and DD). Merged and resolved pi0s are both included.

Ds candidates are obtained from Hlt2CharmHadDs2KKPi_XSecTurbo line, where additional pre-selections are applied.

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