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

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. AndreassenM. 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, V. Batozskaya, V. Battista, A. Bay, L. Beaucourt, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M. O. Bettler, M. Van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P. M. Bjørnstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, M. Borsato, T. J.V. Bowcock, E. Bowen, C. Bozzi, T. Brambach, J. Van Den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, J. Brodzicka, N. H. Brook, H. Brown, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, R. Calabrese, M. Calvi, M. Calvo Gomez, P. Campana, D. Campora Perez, A. Carbone, G. Carboni, R. Cardinale

Research output: Contribution to journalArticle

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Abstract

© 2014 CERN, for the LHCb Collaboration. 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.
Original languageEnglish
JournalPhysical Review Letters
DOIs
Publication statusPublished - 29 Sep 2014
Externally publishedYes

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CP violation
decay
protons
center of mass
baryons
mesons
luminosity
asymmetry
collisions
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., ... Cardinale, R. (2014). Evidence for CP violation in B+ →p p ¯ K+ decays. Physical Review Letters. https://doi.org/10.1103/PhysRevLett.113.141801
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. ; Anderson, J. ; Andreassen, R. ; Andreotti, M. ; Andrews, J. E. ; Appleby, R. B. ; Aquines Gutierrez, O. ; Archilli, F. ; Artamonov, A. ; Artuso, M. ; Aslanides, E. ; Auriemma, G. ; Baalouch, M. ; Bachmann, S. ; Back, J. J. ; Badalov, A. ; Baldini, W. ; Barlow, R. J. ; Barschel, C. ; Barsuk, S. ; Barter, W. ; Batozskaya, V. ; Battista, V. ; Bay, A. ; Beaucourt, L. ; Beddow, J. ; Bedeschi, F. ; Bediaga, I. ; Belogurov, S. ; Belous, K. ; Belyaev, I. ; Ben-Haim, E. ; Bencivenni, G. ; Benson, S. ; Benton, J. ; Berezhnoy, A. ; Bernet, R. ; Bettler, M. O. ; Van Beuzekom, M. ; Bien, A. ; Bifani, S. ; Bird, T. ; Bizzeti, A. ; Bjørnstad, P. M. ; Blake, T. ; Blanc, F. ; Blouw, J. ; Blusk, S. ; Bocci, V. ; Bondar, A. ; Bondar, N. ; Bonivento, W. ; Borghi, S. ; Borgia, A. ; Borsato, M. ; Bowcock, T. J.V. ; Bowen, E. ; Bozzi, C. ; Brambach, T. ; Van Den Brand, J. ; Bressieux, J. ; Brett, D. ; Britsch, M. ; Britton, T. ; Brodzicka, J. ; Brook, N. H. ; Brown, H. ; Bursche, A. ; Busetto, G. ; Buytaert, J. ; Cadeddu, S. ; Calabrese, R. ; Calvi, M. ; Calvo Gomez, M. ; Campana, P. ; Campora Perez, D. ; Carbone, A. ; Carboni, G. ; Cardinale, R. / Evidence for CP violation in B+ →p p ¯ K+ decays. In: Physical Review Letters. 2014.
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title = "Evidence for CP violation in B+ →p p ¯ K+ decays",
abstract = "{\circledC} 2014 CERN, for the LHCb Collaboration. 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 = "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 V. Batozskaya and V. Battista and A. Bay and L. Beaucourt and J. Beddow and F. Bedeschi and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and G. Bencivenni and S. Benson and J. Benton and A. Berezhnoy and R. Bernet and Bettler, {M. O.} and {Van Beuzekom}, M. and A. Bien and S. Bifani and T. Bird and A. Bizzeti and Bj{\o}rnstad, {P. M.} and T. Blake and F. Blanc and J. Blouw and S. Blusk and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and A. Borgia and M. Borsato and Bowcock, {T. J.V.} and E. Bowen and C. Bozzi and T. Brambach and {Van Den Brand}, J. and J. Bressieux and D. Brett and M. Britsch and T. Britton and J. Brodzicka and Brook, {N. H.} and H. Brown and A. Bursche and G. Busetto and J. Buytaert and S. Cadeddu and R. Calabrese and M. Calvi and {Calvo Gomez}, M. and P. Campana and {Campora Perez}, D. and A. Carbone and G. Carboni and R. Cardinale",
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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, Batozskaya, V, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Belogurov, S, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Benton, J, Berezhnoy, A, Bernet, R, Bettler, MO, Van Beuzekom, M, Bien, A, Bifani, S, Bird, T, Bizzeti, A, Bjørnstad, PM, Blake, T, Blanc, F, Blouw, J, Blusk, S, Bocci, V, Bondar, A, Bondar, N, Bonivento, W, Borghi, S, Borgia, A, Borsato, M, Bowcock, TJV, Bowen, E, Bozzi, C, Brambach, T, Van Den Brand, J, Bressieux, J, Brett, D, Britsch, M, Britton, T, Brodzicka, J, Brook, NH, Brown, H, Bursche, A, Busetto, G, Buytaert, J, Cadeddu, S, Calabrese, R, Calvi, M, Calvo Gomez, M, Campana, P, Campora Perez, D, Carbone, A, Carboni, G & Cardinale, R 2014, 'Evidence for CP violation in B+ →p p ¯ K+ decays', Physical Review Letters. https://doi.org/10.1103/PhysRevLett.113.141801

Evidence for CP violation in B+ →p p ¯ K+ decays. / 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.; Anderson, J.; Andreassen, R.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Aquines Gutierrez, O.; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Badalov, A.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Batozskaya, V.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Belogurov, S.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Benton, J.; Berezhnoy, A.; Bernet, R.; Bettler, M. O.; Van Beuzekom, M.; Bien, A.; Bifani, S.; Bird, T.; Bizzeti, A.; Bjørnstad, P. M.; Blake, T.; Blanc, F.; Blouw, J.; Blusk, S.; Bocci, V.; Bondar, A.; Bondar, N.; Bonivento, W.; Borghi, S.; Borgia, A.; Borsato, M.; Bowcock, T. J.V.; Bowen, E.; Bozzi, C.; Brambach, T.; Van Den Brand, J.; Bressieux, J.; Brett, D.; Britsch, M.; Britton, T.; Brodzicka, J.; Brook, N. H.; Brown, H.; Bursche, A.; Busetto, G.; Buytaert, J.; Cadeddu, S.; Calabrese, R.; Calvi, M.; Calvo Gomez, M.; Campana, P.; Campora Perez, D.; Carbone, A.; Carboni, G.; Cardinale, R.

In: Physical Review Letters, 29.09.2014.

Research output: Contribution to journalArticle

TY - JOUR

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

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 - Batozskaya, V.

AU - Battista, V.

AU - Bay, A.

AU - Beaucourt, L.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Belous, K.

AU - Belyaev, I.

AU - Ben-Haim, E.

AU - Bencivenni, G.

AU - Benson, S.

AU - Benton, J.

AU - Berezhnoy, A.

AU - Bernet, R.

AU - Bettler, M. O.

AU - Van Beuzekom, M.

AU - Bien, A.

AU - Bifani, S.

AU - Bird, T.

AU - Bizzeti, A.

AU - Bjørnstad, P. M.

AU - Blake, T.

AU - Blanc, F.

AU - Blouw, J.

AU - Blusk, S.

AU - Bocci, V.

AU - Bondar, A.

AU - Bondar, N.

AU - Bonivento, W.

AU - Borghi, S.

AU - Borgia, A.

AU - Borsato, M.

AU - Bowcock, T. J.V.

AU - Bowen, E.

AU - Bozzi, C.

AU - Brambach, T.

AU - Van Den Brand, J.

AU - Bressieux, J.

AU - Brett, D.

AU - Britsch, M.

AU - Britton, T.

AU - Brodzicka, J.

AU - Brook, N. H.

AU - Brown, H.

AU - Bursche, A.

AU - Busetto, G.

AU - Buytaert, J.

AU - Cadeddu, S.

AU - Calabrese, R.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Campana, P.

AU - Campora Perez, D.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

PY - 2014/9/29

Y1 - 2014/9/29

N2 - © 2014 CERN, for the LHCb Collaboration. 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 - © 2014 CERN, for the LHCb Collaboration. 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.

U2 - 10.1103/PhysRevLett.113.141801

DO - 10.1103/PhysRevLett.113.141801

M3 - Article

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

ER -

Aaij R, Adeva B, Adinolfi M, Affolder A, Ajaltouni Z, Akar S et al. Evidence for CP violation in B+ →p p ¯ K+ decays. Physical Review Letters. 2014 Sep 29. https://doi.org/10.1103/PhysRevLett.113.141801