Determination of γ and -2βs from charmless two-body decays of beauty mesons

LHCb Collaboration; R. Aaij; C. Abellán Beteta; B. Adeva; M. Adinolfi; A. Affolder; 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; J. Anderson; R. Andreassen; M. Andreotti; J. E. Andrews; R. B. Appleby; O. Aquines Gutierrez; F. Archilli; A. Artamonov; M. Artuso; E. Aslanides; G. Auriemma; M. Baalouch; S. Bachmann; J. J. Back; A. Badalov; C. Baesso; W. Baldini; R. J. Barlow; C. Barschel; S. Bifani; N. Farley; P. Griffith; P. Ilten; I. R. Kenyon; C. Lazzeroni; A. Mazurov; J. McCarthy; C. J. Parkinson; L. Pescatore; D. Popov; N. K. Watson

doi:10.1016/j.physletb.2014.12.015

Determination of γ and -2β_sfrom charmless two-body decays of beauty mesons

LHCb Collaboration, R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi, A. Affolder, 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. AnderliniJ. Anderson, R. Andreassen, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, C. J. Parkinson, L. Pescatore, D. Popov, N. K. Watson

Physics and Astronomy

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Abstract

Using the latest LHCb measurements of time-dependent CP violation in the B⁰_s→K⁺K^- decay, a U-spin relation between the decay amplitudes of B⁰_s→K⁺K^- and B⁰→π⁺π^-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B⁰_s mixing phase -2β_s. Results from an extended approach, which uses additional inputs on B⁰→π⁰π⁰and B⁺→π⁺π⁰decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5^+7.2_-6.7)° modulo 180° is determined. In an alternative analysis, the value -2β_s=-0.12^+0.14_-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

Original language	English
Pages (from-to)	1-11
Number of pages	11
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	741
Early online date	9 Dec 2014
DOIs	https://doi.org/10.1016/j.physletb.2014.12.015
Publication status	Published - 4 Feb 2015

ASJC Scopus subject areas

Nuclear and High Energy Physics

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LHCb Collaboration, Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Affolder, A., 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., ... Watson, N. K. (2015). Determination of γ and -2β_sfrom charmless two-body decays of beauty mesons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 741, 1-11. https://doi.org/10.1016/j.physletb.2014.12.015

@article{679b0968361a49ffa61059f927c6bd2f,

title = "Determination of γ and -2βs from charmless two-body decays of beauty mesons",

abstract = "Using the latest LHCb measurements of time-dependent CP violation in the B0s→K+K- decay, a U-spin relation between the decay amplitudes of B0s→K+K- and B0→π+π-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B0s mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5+7.2-6.7)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12+0.14-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.",

author = "{LHCb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and B. Adeva and M. Adinolfi and A. Affolder 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 J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Bifani and N. Farley and P. Griffith and P. Ilten and Kenyon, {I. R.} and C. Lazzeroni and A. Mazurov and J. McCarthy and Parkinson, {C. J.} and L. Pescatore and D. Popov and Watson, {N. K.}",

year = "2015",

month = feb,

day = "4",

doi = "10.1016/j.physletb.2014.12.015",

language = "English",

volume = "741",

pages = "1--11",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

}

LHCb Collaboration, Aaij, R, Abellán Beteta, C, Adeva, B, Adinolfi, M, Affolder, A, 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, Anderson, J, Andreassen, R, Andreotti, M, Andrews, JE, Appleby, RB, Aquines Gutierrez, O, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Bifani, S, Farley, N, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2015, 'Determination of γ and -2β_sfrom charmless two-body decays of beauty mesons', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 741, pp. 1-11. https://doi.org/10.1016/j.physletb.2014.12.015

TY - JOUR

T1 - Determination of γ and -2βs from charmless two-body decays of beauty mesons

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

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 - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Bifani, S.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Kenyon, I. R.

AU - Lazzeroni, C.

AU - Mazurov, A.

AU - McCarthy, J.

AU - Parkinson, C. J.

AU - Pescatore, L.

AU - Popov, D.

AU - Watson, N. K.

PY - 2015/2/4

Y1 - 2015/2/4

N2 - Using the latest LHCb measurements of time-dependent CP violation in the B0s→K+K- decay, a U-spin relation between the decay amplitudes of B0s→K+K- and B0→π+π-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B0s mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5+7.2-6.7)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12+0.14-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

AB - Using the latest LHCb measurements of time-dependent CP violation in the B0s→K+K- decay, a U-spin relation between the decay amplitudes of B0s→K+K- and B0→π+π-decay processes allows constraints to be placed on the angle γ of the unitarity triangle and on the B0s mixing phase -2βs. Results from an extended approach, which uses additional inputs on B0→π0π0and B+→π+π0decays from other experiments and exploits isospin symmetry, are also presented. The dependence of the results on the maximum allowed amount of U-spin breaking is studied. At 68% probability, the value γ=(63.5+7.2-6.7)° modulo 180° is determined. In an alternative analysis, the value -2βs=-0.12+0.14-0.16 rad is found. In both measurements, the uncertainties due to U-spin breaking effects up to 50% are included.

UR - http://www.scopus.com/inward/record.url?scp=84920067746&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2014.12.015

DO - 10.1016/j.physletb.2014.12.015

M3 - Article

AN - SCOPUS:84920067746

VL - 741

SP - 1

EP - 11

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

ER -

Determination of γ and -2βs from charmless two-body decays of beauty mesons

Abstract

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Determination of γ and -2β_sfrom charmless two-body decays of beauty mesons