Identified particle production in inelastic pp events with the ATLAS detector

TL;DR

This paper reports on the measurement of various strange and charmed hadrons produced in proton-proton collisions at 7 TeV using the ATLAS detector, demonstrating the detector's high precision in tracking and reconstruction.

Contribution

First detailed measurements of strange and charmed hadron production in pp collisions at 7 TeV with the ATLAS detector, validating detector performance and reconstruction techniques.

Findings

Mass values agree with world averages

Invariant mass resolutions match Monte Carlo expectations

Successful reconstruction of multiple hadron species

Abstract

Various strange and charmed hadrons were reconstructed with the ATLAS detector in pp collisions at sqrt{s}=7 TeV. The data sample was collected in March-May of 2010 using a minimum-bias trigger. The K^0_S and Lambda^0 kinematic distributions were studied using data corresponding to an integrated luminosity of 190 mub^{-1}. The Xi-+ and Omega-+ baryons were reconstructed in their cascade decays in data corresponding to an integrated luminosity of 250 mub^{-1}. The D*+-, D+- and D_s+- charmed mesons were reconstructed in the range of transverse momentum pT(D^(*))>3.5 GeV and pseudorapidity |eta(D^(*))|<2.1 in data corresponding to an integrated luminosity of 1.4 nb^{-1}. The fitted mass values were found to be in agreement with their world averages while the observed invariant mass resolutions agree with Monte Carlo expectations. This study confirms the high performance of the ATLAS detector for precision tracking measurements.