Observation of the Ξb                             −→J/ψΛK− decay

R. Aaij; B. Adeva; M. Adinolfi; Z. Ajaltouni; S. Akar; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A. A. Alves; S. Amato; S. Amerio; Y. Amhis; L. An; L. Anderlini; G. Andreassi; M. Andreotti; J. E. Andrews; R. B. Appleby; F. Archilli; P. d'Argent; J. Arnau Romeu; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; I. Babuschkin; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; S. Baker; V. Balagura; W. Baldini; R. J. Barlow; S. Bifani; G. Chatzikonstantinidis; N. Farley; P. Griffith; C. Lazzeroni; A. Mazurov; L. Pescatore; A. Sergi; N. K. Watson; M. P. Williams; T. Williams; K. A. Zarebski; LHCb Collaboration

doi:10.1016/j.physletb.2017.06.045

Observation of the Ξ_b ⁻→J/ψΛK⁻ decay

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. Andreotti, J. E. AndrewsR. B. Appleby, F. Archilli, P. d'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, V. Balagura, W. Baldini, R. J. Barlow, S. Bifani, G. Chatzikonstantinidis, N. Farley, P. Griffith, C. Lazzeroni, A. Mazurov, L. Pescatore, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski, LHCb Collaboration

Physics and Astronomy

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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
Early online date	26 Jun 2017
DOIs	https://doi.org/10.1016/j.physletb.2017.06.045
Publication status	Published - 10 Sep 2017

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Aaij_et_al_Observation_of_the_decay_Physics_Letters_B_
Published in Physics Letters B on 26/06/2017 DOI: 10.1016/j.physletb.2017.06.045
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Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A. A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., ... LHCb Collaboration (2017). Observation of the Ξ_b ⁻→J/ψΛK⁻ decay. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 772, 265-273. https://doi.org/10.1016/j.physletb.2017.06.045

@article{37a691fee35a472498147d3a62458860,

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 = "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 S. Bifani and G. Chatzikonstantinidis and N. Farley and P. Griffith and C. Lazzeroni and A. Mazurov and L. Pescatore and A. Sergi and Watson, {N. K.} and Williams, {M. P.} and T. Williams and Zarebski, {K. A.} and {LHCb Collaboration}",

year = "2017",

month = sep,

day = "10",

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

language = "English",

volume = "772",

pages = "265--273",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F, d'Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Balagura, V, Baldini, W, Barlow, RJ, Bifani, S, Chatzikonstantinidis, G, Farley, N, Griffith, P, Lazzeroni, C, Mazurov, A, Pescatore, L, Sergi, A, Watson, NK, Williams, MP, Williams, T, Zarebski, KA & LHCb Collaboration 2017, 'Observation of the Ξ_b ⁻→J/ψΛK⁻ decay', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 772, pp. 265-273. https://doi.org/10.1016/j.physletb.2017.06.045

TY - JOUR

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

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 - Bifani, S.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Griffith, P.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Pescatore, L.

AU - Sergi, A.

AU - Watson, N. K.

AU - Williams, M. P.

AU - Williams, T.

AU - Zarebski, K. A.

AU - LHCb Collaboration

PY - 2017/9/10

Y1 - 2017/9/10

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.

UR - http://www.scopus.com/inward/record.url?scp=85030541375&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2017.06.045

DO - 10.1016/j.physletb.2017.06.045

M3 - Article

AN - SCOPUS:85030541375

VL - 772

SP - 265

EP - 273

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -

Observation of the Ξb −→J/ψΛK− decay

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Observation of the Ξ_b ⁻→J/ψΛK⁻ decay