Observations of Λb0 → ΛK+π− and Λb0 → ΛK+K− decays and searches for other Λb0 and Ξb0 decays to Λh+h′− final states

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作者：
R. Aaij
C. Abellán Beteta
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
O. Aquines Gutierrez
F. Archilli
P. d’Argent
A. Artamonov
M. Artuso
E. Aslanides
G. Auriemma
M. Baalouch
S. Bachmann
J. J. Back
A. Badalov
C. Baesso
S. Baker
W. Baldini
R. J. Barlow
C. Barschel
S. Barsuk
W. Barter
V. Batozskaya
V. Battista
A. Bay
L. Beaucourt
J. Beddow
F. Bedeschi
I. Bediaga
L. J. Bel
V. Bellee
N. Belloli
机构：
[1] Centro Brasileiro de Pesquisas Físicas (CBPF),Center for High Energy Physics
[2] Universidade Federal do Rio de Janeiro (UFRJ),Physikalisches Institut
[3] Tsinghua University,School of Physics
[4] LAPP,Physik
[5] Université Savoie Mont-Blanc,Institut
[6] CNRS/IN2P3,H.H. Wills Physics Laboratory
[7] Clermont Université,Cavendish Laboratory
[8] Université Blaise Pascal,Department of Physics
[9] CNRS/IN2P3,School of Physics and Astronomy
[10] LPC,School of Physics and Astronomy
[11] CPPM,Oliver Lodge Laboratory
[12] Aix-Marseille Université,School of Physics and Astronomy
[13] CNRS/IN2P3,Department of Physics
[14] LAL,Institut für Physik
[15] Université Paris-Sud,Van Swinderen Institute
[16] CNRS/IN2P3,undefined
[17] LPNHE,undefined
[18] Université Pierre et Marie Curie,undefined
[19] Université Paris Diderot,undefined
[20] CNRS/IN2P3,undefined
[21] I. Physikalisches Institut,undefined
[22] RWTH Aachen University,undefined
[23] Fakultät Physik,undefined
[24] Technische Universität Dortmund,undefined
[25] Max-Planck-Institut für Kernphysik (MPIK),undefined
[26] Ruprecht-Karls-Universität Heidelberg,undefined
[27] University College Dublin,undefined
[28] Sezione INFN di Bari,undefined
[29] Sezione INFN di Bologna,undefined
[30] Sezione INFN di Cagliari,undefined
[31] Sezione INFN di Ferrara,undefined
[32] Sezione INFN di Firenze,undefined
[33] Laboratori Nazionali dell’INFN di Frascati,undefined
[34] Sezione INFN di Genova,undefined
[35] Sezione INFN di Milano Bicocca,undefined
[36] Sezione INFN di Milano,undefined
[37] Sezione INFN di Padova,undefined
[38] Sezione INFN di Pisa,undefined
[39] Sezione INFN di Roma Tor Vergata,undefined
[40] Sezione INFN di Roma La Sapienza,undefined
[41] Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences,undefined
[42] AGH - University of Science and Technology,undefined
[43] Faculty of Physics and Applied Computer Science,undefined
[44] National Center for Nuclear Research (NCBJ),undefined
[45] Horia Hulubei National Institute of Physics and Nuclear Engineering,undefined
[46] Petersburg Nuclear Physics Institute (PNPI),undefined
[47] Institute of Theoretical and Experimental Physics (ITEP),undefined
[48] Institute of Nuclear Physics,undefined
[49] Moscow State University (SINP MSU),undefined
[50] Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN),undefined
来源：
Journal of High Energy Physics | / 2016卷
关键词：
Branching fraction; CP violation; Flavor physics; Rare decay; Hadron-Hadron scattering (experiments);
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摘要：
A search is performed for the charmless three-body decays of the Λb0 and Ξb0 baryons to the final states Λh+h′−, where h(′) = π or K. The analysis is based on a data sample, corresponding to an integrated luminosity of 3 fb−1 of pp collisions, collected by the LHCb experiment. The Λb0 → ΛK+π− and Λb0 → ΛK+K− decays are observed for the first time and their branching fractions and CP asymmetry parameters are measured. Evidence is seen for the Λb0 → Λπ+π− decay and limits are set on the branching fractions of Ξb0 baryon decays to the Λh+h′− final states. [graphic not available: see fulltext]
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