A new algorithm for identifying the flavour of B0s mesons at LHCb

Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P. Alvarez; Jr, A. A.  Alves; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Gutierrez, O. Aquines; Archilli, F.; d'Argent, P.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Batozskaya, V.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Bel, L. 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doi:10.1088/1748-0221/11/05/P05010

Title: A new algorithm for identifying the flavour of B⁰_s mesons at LHCb

Journal Article · Tue May 17 00:00:00 EDT 2016 · Journal of Instrumentation

DOI:https://doi.org/10.1088/1748-0221/11/05/P05010· OSTI ID:1525149

Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P. Alvarez; Jr, A. A. Alves; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G. more »

A new algorithm for the determination of the initial flavour of B⁰_s mesons is presented. The algorithm is based on two neural networks and exploits the b hadron production mechanism at a hadron collider. The first network is trained to select charged kaons produced in association with the B⁰_s meson. The second network combines the kaon charges to assign the B⁰_s flavour and estimates the probability of a wrong assignment. The algorithm is calibrated using data corresponding to an integrated luminosity of 3 fb^–1 collected by the LHCb experiment in proton-proton collisions at 7 and 8 TeV centre-of-mass energies. The calibration is performed in two ways: by resolving the B⁰_s–_B¯⁰_s flavour oscillations in B⁰_s → D^–_sπ⁺ decays, and by analysing flavour-specific B*_s2(5840)⁰ → B⁺K^– decays. The tagging power measured in B⁰_s → D^–_sπ⁺ decays is found to be (1.80 ± 0.19 (stat) ± 0.18 (syst))%, which is an improvement of about 50% compared to a similar algorithm previously used in the LHCb experiment.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: The LHCb collaboration

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1525149

Journal Information:: Journal of Instrumentation, Vol. 11, Issue 05; ISSN 1748-0221

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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Cited By (3)

CP violation in the B system Gershon, T.; Gligorov, V. V. Reports on Progress in Physics, Vol. 80, Issue 4 https://doi.org/10.1088/1361-6633/aa5514	journal	February 2017
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New algorithms for identifying the flavour of $${\mathrm {B}} ^0$$ B 0 mesons using pions and protons Aaij, R.; Adeva, B.; Adinolfi, M. The European Physical Journal C, Vol. 77, Issue 4 https://doi.org/10.1140/epjc/s10052-017-4731-y	journal	April 2017

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