Particle identification in ALICE: a Bayesian approach
ALICE Collaboration. (2016). Particle identification in ALICE: a Bayesian approach. European Physical Journal Plus, 131(5), Article 168. https://doi.org/10.1140/epjp/i2016-16168-5
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European Physical Journal PlusAuthors
Date
2016Copyright
© CERN for the benefit of the ALICE Collaboration 2016. This article is published with open access at Springerlink.com and distributed under the terms of a the Creative Commons Attribution 4.0 License.
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 K0
S → 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 effi-
ciency. 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.
...
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Except where otherwise noted, this item's license is described as © CERN for the benefit of the ALICE Collaboration 2016. This article is published with open access at Springerlink.com and distributed under the terms of a the Creative Commons Attribution 4.0 License.
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