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Particle identification in ALICE: a Bayesian approach

Adam, J.; Adamova, D.; Aggarwal, M.M; Aglieri Rinella, G; Agnello, M.; Agrawal, N; Christiansen, Peter LU ; Ljunggren, Martin LU ; Oskarsson, Anders LU and Richert, Tuva LU , et al. (2016) In European Physical Journal Plus 131(5).
Abstract
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+}, ɸ → K-K+, and Λ → p π- in p-Pb collisions at √sNN=5.02 TeV. In order to... (More)
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+}, ɸ → K-K+, and Λ → p π- 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 Λc + → p K-π+ in pp collisions at √s=7 TeV, using the Bayesian approach for the identification of its decay products. © 2016, CERN for the benefit of the ALICE Collaboration. (Less)
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European Physical Journal Plus
volume
131
issue
5
publisher
Springer
external identifiers
  • scopus:84971408174
  • wos:000376587700004
ISSN
2190-5444
DOI
10.1140/epjp/i2016-16168-5
language
English
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yes
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927c5106-997d-43bf-9a7e-ffbbc91b77c7
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2017-07-21 12:33:45
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2017-11-14 09:55:55
@article{927c5106-997d-43bf-9a7e-ffbbc91b77c7,
  abstract     = {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+}, ɸ → K-K+, and Λ → p π- 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 Λc + → p K-π+ in pp collisions at √s=7 TeV, using the Bayesian approach for the identification of its decay products. © 2016, CERN for the benefit of the ALICE Collaboration.},
  articleno    = {168},
  author       = {Adam, J. and Adamova, D. and Aggarwal, M.M and Aglieri Rinella, G and Agnello, M. and Agrawal, N and Christiansen, Peter and Ljunggren, Martin and Oskarsson, Anders and Richert, Tuva and Silvermyr, David and Stenlund, Evert and Vislavicius, Vytautas and , },
  issn         = {2190-5444},
  language     = {eng},
  number       = {5},
  publisher    = {Springer},
  series       = {European Physical Journal Plus},
  title        = {Particle identification in ALICE: a Bayesian approach},
  url          = {http://dx.doi.org/10.1140/epjp/i2016-16168-5},
  volume       = {131},
  year         = {2016},
}