Observation of the Ξb                      −→J/ψΛK− decay

The LHCb collaboration

doi:10.1016/j.physletb.2017.06.045

Observation of the Ξ_b ⁻→J/ψΛK⁻ decay

The LHCb collaboration

European Organization for Nuclear Research
University Santiago de Compostela
University of Bristol
Clermont-Auvergne University
University of Cincinnati
Fakultät Physik
University of Dortmund
SUPA
University of Glasgow
Science Park 105
Petersburg Nuclear Physics Institute (PNPI)
Imperial College London
Instituto de Biofisica da UFRJ
INFN
Laboratoire de l'Accélérateur Linéaire
Center for High Energy Physics
Tsinghua University
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
Institute of Physics
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Maryland, College Park
School of Physics and Astronomy
University of Manchester
University of Heidelberg
Aix-Marseille Université
Kurchatov Institute
Syracuse University
Sezione di Roma
University of Warwick
ICCUB
University of Barcelona
Pontifícia Universidade Católica do Rio de Janeiro
Institute for Theoretical and Experimental Physics
Institute for Nuclear Physics
National Centre for Nuclear Research (NCBJ)
Université Savoie Mont Blanc

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

The observation of the decay Ξ_b ⁻→J/ψΛK⁻ is reported, using a data sample corresponding to an integrated luminosity of 3fb⁻¹, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξ_b ⁻ baryons detected in the decay Ξ_b ⁻→J/ψΛK⁻ is measured relative to that of Λ_b ⁰ baryons using the decay Λ_b ⁰→J/ψΛ. Integrated over the b-baryon transverse momentum p_T<25GeV/c and rapidity 2.0<y<4.5, the measured ratio is [Formula presented][Formula presented]=(4.19±0.29 (stat)±0.15 (syst))×10⁻², where f_{Ξ_b ⁻} and f_{Λ_b ⁰} are the fragmentation fractions of b→Ξ_b ⁻ and b→Λ_b ⁰ transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξ_b ⁻ and Λ_b ⁰ baryons is measured to be M(Ξ_b ⁻)−M(Λ_b ⁰)=177.08±0.47 (stat)±0.16 (syst)MeV/c².

Original language	English
Pages (from-to)	265-273
Number of pages	9
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	772
DOIs	https://doi.org/10.1016/j.physletb.2017.06.045
Publication status	Published - 1 Jan 2017
Externally published	Yes

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10.1016/j.physletb.2017.06.045

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@article{6ba2fca571524386b9be72a737f9af75,

title = "Observation of the Ξb −→J/ψΛK− decay",

abstract = "The observation of the decay Ξb −→J/ψΛK− is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξb − baryons detected in the decay Ξb −→J/ψΛK− is measured relative to that of Λb 0 baryons using the decay Λb 0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0−2, where fΞb − and fΛb 0 are the fragmentation fractions of b→Ξb − and b→Λb 0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb − and Λb 0 baryons is measured to be M(Ξb −)−M(Λb 0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.",

author = "\{The LHCb collaboration\} and R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, \{J. E.\} and Appleby, \{R. B.\} and F. Archilli and P. d'Argent and \{Arnau Romeu\}, J. and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, \{J. J.\} and A. Badalov and C. Baesso and S. Baker and V. Balagura and W. Baldini and Barlow, \{R. J.\} and C. Barschel and S. Barsuk and W. Barter and F. Baryshnikov and M. Baszczyk and V. Batozskaya and B. Batsukh and V. Battista and A. Bay and L. Beaucourt and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2017 The Author(s)",

year = "2017",

month = jan,

day = "1",

doi = "10.1016/j.physletb.2017.06.045",

language = "English",

volume = "772",

pages = "265--273",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Observation of the Ξb −→J/ψΛK− decay

AU - The LHCb collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d'Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Baszczyk, M.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battista, V.

AU - Bay, A.

AU - Beaucourt, L.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The observation of the decay Ξb −→J/ψΛK− is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξb − baryons detected in the decay Ξb −→J/ψΛK− is measured relative to that of Λb 0 baryons using the decay Λb 0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0−2, where fΞb − and fΛb 0 are the fragmentation fractions of b→Ξb − and b→Λb 0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb − and Λb 0 baryons is measured to be M(Ξb −)−M(Λb 0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.

AB - The observation of the decay Ξb −→J/ψΛK− is reported, using a data sample corresponding to an integrated luminosity of 3fb−1, collected by the LHCb detector in pp collisions at centre-of-mass energies of 7 and 8TeV. The production rate of Ξb − baryons detected in the decay Ξb −→J/ψΛK− is measured relative to that of Λb 0 baryons using the decay Λb 0→J/ψΛ. Integrated over the b-baryon transverse momentum pT<25GeV/c and rapidity 2.0−2, where fΞb − and fΛb 0 are the fragmentation fractions of b→Ξb − and b→Λb 0 transitions, and B represents the branching fraction of the corresponding b-baryon decay. The mass difference between Ξb − and Λb 0 baryons is measured to be M(Ξb −)−M(Λb 0)=177.08±0.47 (stat)±0.16 (syst)MeV/c2.

U2 - 10.1016/j.physletb.2017.06.045

DO - 10.1016/j.physletb.2017.06.045

M3 - Article

AN - SCOPUS:85030541375

SN - 0370-2693

VL - 772

SP - 265

EP - 273

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Observation of the Ξb −→J/ψΛK− decay

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Observation of the Ξ_b ⁻→J/ψΛK⁻ decay