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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Heavy Ion Collision and QCD Phases VII

HK 25.1: Gruppenbericht

Dienstag, 15. März 2016, 16:30–17:00, S1/01 A4

A Bayesian approach to particle identification in ALICE — •Jeremy Wilkinson for the ALICE collaboration — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg

Particle identification (PID) is one of the major strengths of the ALICE detector at the LHC, and provides essential insight into quark-gluon plasma formation in heavy-ion collisions. PID is most effective when complementary identification techniques (such as specific energy loss in the Time Projection Chamber, or flight times measured by the Time Of Flight detector) are combined, however with standard PID techniques it can be difficult to combine these signals, especially when detectors with non-Gaussian responses are used.

Here, an alternative probabilistic PID approach based on Bayes’ theorem will be presented. This method facilitates the combination of different detector technologies based on the combined probability of a particle type to produce the signals measured in various detectors. The Bayesian PID approach will be briefly outlined, and benchmark analyses will be presented for high-purity samples of pions, kaons, and protons, as well as for the two-pronged decay D⁰→ K⁻π⁺, comparing the performance of the standard PID approach with that of the Bayesian approach. Finally, prospects for measuring the Λ_c baryon in the three-pronged decay channel Λ_c⁺→ p K⁻π⁺ will be presented.