Adding d0 and z0sintheta Significance for EasyJet Ntuple Production

Storm Linrequested to merge
stlin/athena:easyjet_ips into main

Adds retrieval and calculation of impact parameter variables d0 and z0sintheta significance alongside the existing d0 significance and z0sintheta.

Goal of this is to have these variables available for inclusion in EasyJet ntuple productions.

Example plots showing the distributions of these new variables for a test sample (~20 thousand events of single lepton ttbar):

el_d0_3_25

el_z0sinthetasig_3_25

mu_d0_3_25

mu_z0sinthetasig_3_25

Tagging to the attention of: @giacinto @mtanasin @pbokan @bmoser

Edited by Storm Lin

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