Evidence for CP violation in B+ → pp¯K+ decays

LHCb Collaboration; R. Aaij; 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; W. Baldini; R. J. Barlow; C. Barschel; S. Barsuk; W. Barter; 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:10.1103/PhysRevLett.113.141801

Evidence for CP violation in B⁺ → pp¯K⁺ decays

LHCb Collaboration, R. Aaij^*, 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. AndersonR. 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, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, 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

^*Corresponding author for this work

Physics and Astronomy

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Abstract

Three-body B⁺→pp¯K⁺ and B⁺→pp¯π⁺ decays are studied using a data sample corresponding to an integrated luminosity of 3.0fb^-1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B⁺→pp¯K⁺ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp¯ rest frame yield A_FB(pp¯K⁺,m_pp¯<2.85GeV/c²)=0.495±0.012(stat)±0.007(syst) and A_FB(pp¯π+,m_pp¯<2.85GeV/c²)=-0.409±0.033(stat)±0.006(syst). In addition, the branching fraction of the decay B⁺→Λ¯(1520)p is measured to be B(B⁺→Λ¯(1520)p)=(3.15±0.48(stat)±0.07(syst)±0.26(BF))×10^-7, where BF denotes the uncertainty on secondary branching fractions.

Original language	English
Article number	141801
Number of pages	9
Journal	Physical Review Letters
Volume	113
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.113.141801
Publication status	Published - 29 Sept 2014

ASJC Scopus subject areas

General Physics and Astronomy

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Cite this

LHCb Collaboration, Aaij, R., 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., Anderlini, L., ... Watson, N. K. (2014). Evidence for CP violation in B⁺ → pp¯K⁺ decays. Physical Review Letters, 113(14), Article 141801. https://doi.org/10.1103/PhysRevLett.113.141801

@article{28e3db302a3549498ddd04cc1df839cc,

title = "Evidence for CP violation in B+ → pp¯K+ decays",

abstract = "Three-body B+→pp¯K+ and B+→pp¯π+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0fb-1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B+→pp¯K+ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp¯ rest frame yield AFB(pp¯K+,mpp¯<2.85GeV/c2)=0.495±0.012(stat)±0.007(syst) and AFB(pp¯π+,mpp¯<2.85GeV/c2)=-0.409±0.033(stat)±0.006(syst). In addition, the branching fraction of the decay B+→Λ¯(1520)p is measured to be B(B+→Λ¯(1520)p)=(3.15±0.48(stat)±0.07(syst)±0.26(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.",

author = "{LHCb Collaboration} and R. Aaij 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 W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter 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 = "2014",

month = sep,

day = "29",

doi = "10.1103/PhysRevLett.113.141801",

language = "English",

volume = "113",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "14",

}

LHCb Collaboration, Aaij, R, 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, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Bifani, S, Farley, N, Griffith, P, Ilten, P, Kenyon, IR, Lazzeroni, C, Mazurov, A, McCarthy, J, Parkinson, CJ, Pescatore, L, Popov, D & Watson, NK 2014, 'Evidence for CP violation in B⁺ → pp¯K⁺ decays', Physical Review Letters, vol. 113, no. 14, 141801. https://doi.org/10.1103/PhysRevLett.113.141801

TY - JOUR

T1 - Evidence for CP violation in B+ → pp¯K+ decays

AU - LHCb Collaboration

AU - Aaij, R.

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 - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

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 - 2014/9/29

Y1 - 2014/9/29

N2 - Three-body B+→pp¯K+ and B+→pp¯π+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0fb-1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B+→pp¯K+ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp¯ rest frame yield AFB(pp¯K+,mpp¯<2.85GeV/c2)=0.495±0.012(stat)±0.007(syst) and AFB(pp¯π+,mpp¯<2.85GeV/c2)=-0.409±0.033(stat)±0.006(syst). In addition, the branching fraction of the decay B+→Λ¯(1520)p is measured to be B(B+→Λ¯(1520)p)=(3.15±0.48(stat)±0.07(syst)±0.26(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.

AB - Three-body B+→pp¯K+ and B+→pp¯π+ decays are studied using a data sample corresponding to an integrated luminosity of 3.0fb-1 collected by the LHCb experiment in proton-proton collisions at center-of-mass energies of 7 and 8 TeV. Evidence of CP violation in the B+→pp¯K+ decay is found in regions of the phase space, representing the first measurement of this kind for a final state containing baryons. Measurements of the forward-backward asymmetry of the light meson in the pp¯ rest frame yield AFB(pp¯K+,mpp¯<2.85GeV/c2)=0.495±0.012(stat)±0.007(syst) and AFB(pp¯π+,mpp¯<2.85GeV/c2)=-0.409±0.033(stat)±0.006(syst). In addition, the branching fraction of the decay B+→Λ¯(1520)p is measured to be B(B+→Λ¯(1520)p)=(3.15±0.48(stat)±0.07(syst)±0.26(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.

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U2 - 10.1103/PhysRevLett.113.141801

DO - 10.1103/PhysRevLett.113.141801

M3 - Article

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SN - 0031-9007

VL - 113

JO - Physical Review Letters

JF - Physical Review Letters

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