Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 40: Schwerionenkollisionen und QCD Phasen V

HK 40.2: Vortrag

Mittwoch, 23. März 2011, 16:45–17:00, HS AP

Neutral strange hadron reconstruction in pp and PbPb collisions at LHC energies — •Simone Schuchmann — Institut für Kernphysik Frankfurt (IKF), Goethe-Universität Frankfurt

Strange particles like Λ and K_s⁰ are the most abundant neutral strange particles in hadronic collisions. Therefore it is possible to use their invariant mass distributions not only for physics analysis but also for detailed detector performance studies.

This presentation will mainly focus on the impact of the ALICE detector performance on the measurement of Λ and K_s⁰ masses and widths. In particular, particles reconstructed with the Time Projection Chamber (TPC) and the Inner Tracking System (ITS) have been analysed.
Within this performance analysis the K_s⁰ width is of greatest interest, because it strongly depends on the momentum resolution. The K_s⁰ width has been studied as function of p_⊥, centrality, polar and azimuthal angles. The width of the Λ is much less sensitive to the resolution, however its mass difference with respect to the Λ is supposed to reveal overall shifts of the momentum scale due to residual imperfections of the detector calibration.
The results presented in this contribution are based on data sets for pp collisions at √s=7 TeV and PbPb collisions at √s_NN=2.76 TeV collected in 2010.