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Abnormal lambda daughter pion eta distribution update

Updated on Mon, 2019-12-09 08:15. Originally created by yxu on 2019-12-04 04:46.

a check for the abnormal pion eta 
Abnormal_pion_eta_update_xuyike_20191204



Set a cut if pion unmatched, pt ≤ 0.4 GeV && |eta| ≤ 0.05
Eta_cut_purity_improvement_xuyike_Dec_09_2019.pdf

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