Observation of the decay Λb        0 → pK − μ + μ − and a search for CP violation

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; C. Barschel; S. Barsuk; S. Bifani; G. Chatzikonstantinidis; N. Farley; C. Lazzeroni; A. Mazurov; A. Sergi; N. K. Watson; M. P. Williams; T. Williams; K. A. Zarebski; LHCb Collaboration

doi:10.1007/JHEP06(2017)108

Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation

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, C. Barschel, S. Barsuk, S. Bifani, G. Chatzikonstantinidis, N. Farley, C. Lazzeroni, A. Mazurov, A. Sergi, N. K. Watson, M. P. Williams, T. Williams, K. A. Zarebski, LHCb Collaboration

Physics and Astronomy

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Abstract

A search for CP violation in the decay Λ_b ⁰ → pK⁻μ⁺μ⁻ is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb⁻¹. The Λ_b ⁰ → pK⁻μ⁺μ⁻ decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ⁺μ⁻ and pK⁻ decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].

Original language	English
Journal	Journal of High Energy Physics
Volume	2017
Issue number	6
DOIs	https://doi.org/10.1007/JHEP06(2017)108
Publication status	Published - 21 Jun 2017

Keywords

B physics
CP violation
FCNC Interaction
Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1007/JHEP06(2017)108Licence: Creative Commons: Attribution (CC BY)

Aaij_et_al_Observation_of_the_decay_Journal_of_High_Energy_Physics_2017
Published in Journal of High Energy Physics on 21/06/2017 DOI: 10.1007/JHEP06(2017)108
Final published version, 568 KBLicence: Creative Commons: Attribution (CC BY)

https://link.springer.com/article/10.1007/JHEP06%282017%29108Licence: Creative Commons: Attribution (CC BY)

Cite this

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 decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation. Journal of High Energy Physics, 2017(6). https://doi.org/10.1007/JHEP06(2017)108

@article{6baea3f56dce41eaa57d4d4da2490c4c,

title = "Observation of the decay Λb 0 → pK − μ + μ − and a search for CP violation",

abstract = "A search for CP violation in the decay Λb 0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb 0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].",

keywords = "B physics, CP violation, FCNC Interaction, Hadron-Hadron scattering (experiments)",

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

year = "2017",

month = jun,

day = "21",

doi = "10.1007/JHEP06(2017)108",

language = "English",

volume = "2017",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

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number = "6",

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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, 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, Barschel, C, Barsuk, S, Bifani, S, Chatzikonstantinidis, G, Farley, N, Lazzeroni, C, Mazurov, A, Sergi, A, Watson, NK, Williams, MP, Williams, T, Zarebski, KA & LHCb Collaboration 2017, 'Observation of the decay Λ_b ⁰ → pK ⁻ μ ⁺ μ ⁻ and a search for CP violation', Journal of High Energy Physics, vol. 2017, no. 6. https://doi.org/10.1007/JHEP06(2017)108

TY - JOUR

T1 - Observation of the decay Λb 0 → pK − μ + μ − and a search for CP violation

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 - Bifani, S.

AU - Chatzikonstantinidis, G.

AU - Farley, N.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - Sergi, A.

AU - Watson, N. K.

AU - Williams, M. P.

AU - Williams, T.

AU - Zarebski, K. A.

AU - LHCb Collaboration

PY - 2017/6/21

Y1 - 2017/6/21

N2 - A search for CP violation in the decay Λb 0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb 0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].

AB - A search for CP violation in the decay Λb 0 → pK−μ+μ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λb 0 → pK−μ+μ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, (Formula Presented.)where the latter is based on asymmetries in the angle between the μ+μ− and pK− decay planes. These are measured to be(Formula Presented.)and no evidence for CP violation is found.[Figure not available: see fulltext.].

KW - B physics

KW - CP violation

KW - FCNC Interaction

KW - Hadron-Hadron scattering (experiments)

UR - http://www.scopus.com/inward/record.url?scp=85021447249&partnerID=8YFLogxK

U2 - 10.1007/JHEP06(2017)108

DO - 10.1007/JHEP06(2017)108

M3 - Article

AN - SCOPUS:85021447249

SN - 1126-6708

VL - 2017

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 6

ER -

Observation of the decay Λb 0 → pK − μ + μ − and a search for CP violation