added filtering script FilterBs2MuMuGamma-S28r1p1-mdst.py
add filtering script FilterBs2MuMuGamma-S28r1p1-mdst.py for Bs2MuMuGamma direct analysis
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add filtering script FilterBs2MuMuGamma-S28r1p1-mdst.py for Bs2MuMuGamma direct analysis