Particle identification in ALICE: a Bayesian approach

Adam, J. and Antičić, Tome and Erhardt, Filip and Gotovac, Sven and Mudnić, Eugen and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Vicković, Linda and Zyzak, M. (ALICE Collaboration) (2016) Particle identification in ALICE: a Bayesian approach. European Physical Journal Plus, 131. pp. 168-24. ISSN 2190-5444

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Abstract

Particle identification ; Bayesian approach Sažetak: We present a Bayesian approach to particle identification (PID) within the ALICE experiment. The aim is to more effectively combine the particle identification capabilities of its various detectors. After a brief explanation of the adopted methodology and formalism, the performance of the Bayesian PID approach for charged pions, kaons and protons in the central barrel of ALICE is studied. PID is performed via measurements of specific energy loss (dE/dx) and time-of-flight. PID efficiencies and misidentification probabilities are extracted and compared with Monte Carlo simulations using high- purity samples of identified particles in the decay channels K0S→π−π+, ϕ→K−K+, and Λ→pπ− in p- Pb collisions at √sNN=5.02 TeV. In order to thoroughly assess the validity of the Bayesian approach, this methodology was used to obtain corrected pT spectra of pions, kaons, protons, and D0 mesons in pp collisions at √s=7 TeV. In all cases, the results using Bayesian PID were found to be consistent with previous measurements performed by ALICE using a standard PID approach. For the measurement of D0→K−π+, it was found that a Bayesian PID approach gave a higher signal-to- background ratio and a similar or larger statistical significance when compared with standard PID selections, despite a reduced identification efficiency. Finally, we present an exploratory study of the measurement of Λ+c→pK−π+ in pp collisions at √s=7 TeV, using the Bayesian approach for the identification of its decay products.

Item Type: Article
Keywords: particle identification, Bayesian approach
Date: May 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © CERN for the benefit of the ALICE Collaboration 2016. This article is published with open access at Springerlink.com. Received: 8 February 2016. Revised: 27 March 2016. Published online: 25 May 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: Springer
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 28 Oct 2017 17:12
Last Modified: 28 Oct 2017 17:12
URI: http://digre.pmf.unizg.hr/id/eprint/5627

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