Tagging b-jets using low-pt electrons (full rapidity range)

This note presents an extension of a previous study on the expected performance of b-jet tagging in ATLAS experiment using low-pt electrons from semileptonic b-quark decays. Inner Detector and the EM Calorimeter information is used.The performance is evaluated in terms of the expected hadron rejection versus the electron identification efficiency and the expected suppression of background events versus the acceptance of signal events. The samples of Higgs decays H->bb (H->gg,uu,cc) with mH=100 GeV and mH=400 GeV are used as signal (background) events, in full rapidity coverage (|eta| < 2.5) and for low luminosity operation.For an algorithm efficiency of 50%, rejections of 470 against u-jets for mH=100 GeV (resp.55 for mH=400 GeV), 209 (resp.43)against gluon jets and of 44 (resp.22) against c-jets can be achieved.