A new algorithm for the determination of the initial flavour of B-s(0) 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 B-s(0) meson. The second network combines the kaon charges to assign the B-s(0) 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 B-s(0)-B-s(0) flavour oscillations in B-s(0) -> D-s(-)pi(+) decays, and by analysing flavour-specific B-s2*(5840)(0) -> B+K- decays. The tagging power measured in B-s(0) -> D-s(-)pi(+) 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.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    A new algorithm for identifying the flavour of B-s(0) mesons at LHCb


    Beteiligte:
    Aaij, R. (Autor:in) / Beteta, C. Abellan (Autor:in) / Adeva, B. (Autor:in) / Adinolfi, M. (Autor:in) / Affolder, A. (Autor:in) / Ajaltouni, Z. (Autor:in) / Akar, S. (Autor:in) / Albrecht, J. (Autor:in) / Alessio, F. (Autor:in) / Alexander, M. (Autor:in)

    Erscheinungsdatum :

    2016-05-01


    Anmerkungen:

    Aaij , R , Beteta , C A , Adeva , B , Adinolfi , M , Affolder , A , Ajaltouni , Z , Akar , S , Albrecht , J , Alessio , F , Alexander , M , Ali , S , Alkhazov , G , Cartelle , P A , Alves , A A , Amato , S , Amerio , S , Amhis , Y , An , L , Anderlini , L , Andreassi , G , Andreotti , M , Andrews , J E , Appleby , R B , Gutierrez , O A , 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 , Beaucourt , L , Beddow , J , Bedeschi , F , Bediaga , I , Bel , L J , Onderwater , C J G , Pellegrino , A , Tolk , S & LHCb Collaboration 2016 , ' A new algorithm for identifying the flavour of B-s(0) mesons at LHCb ' , Journal of Instrumentation , vol. 11 , 05010 . https://doi.org/10.1088/1748-0221/11/05/P05010 ; ISSN:1748-0221



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629



    A new algorithm for identifying the flavour of B0 s mesons at LHCb

    Aaij, R. / Abellán Beteta, C. / Adeva, B. et al. | BASE | 2016

    Freier Zugriff

    A new algorithm for identifying the flavour of B-s(0) mesons at LHCb

    Aaij, R. / Beteta, C. Abellan / Adeva, B. et al. | BASE | 2016

    Freier Zugriff

    Flavour of the bunch

    Online Contents | 1997


    Optical 'mesons' and 'hadrons'

    Drummond, P.D. / He, H. / Kheruntsyan, K. | IEEE | 1997


    News - Dutch flavour to Space Station mission

    Kidger, Neville | Online Contents | 2004