Evidence for CP violation in $B^+\to p \overline p K^+$ decays

R. Aaij; Y. Amhis; S. Barsuk; M. Borsato; O. Callot; O. Kochebina; J. Lefrançois; F. Machefert; A. Martin Sanchez; Marie Nicol; P. Robbe; M.-H. Schune; M. Teklishyn; A. Vallier; B. Viaud; S. Akar; E. Aslanides; J. Cogan; W. Kanso; R. Legac; O. Leroy; G. Mancinelli; A. Mordà; M. Perrin-Terrin; J. Serrano; A. Tsaregorodtsev; L. Beaucourt; M. Chefdeville; D. Decamp; N. Déléage; Ph. Ghez; J.-P. Lees; J.F. Marchand; M.-N. Minard; B. Pietrzyk; W. Qian; S. t'Jampens; V. Tisserand; E. Tournefier; Ziad Ajaltouni; M. Baalouch; E. Cogneras; O. Deschamps; I. El Rifai; M. Grabalosa Gándara; Pierre Henrard; M. Hoballah; R. Lefèvre; J. Maratas; S. Monteil; V. Niess; Pascal Perret; Diego Alejandro Roa Romero

doi:10.1103/PhysRevLett.113.141801

Journal articles

Evidence for CP violation in $B^+\to p \overline p K^+$ decays

R. Aaij Y. Amhis ¹ S. Barsuk ¹ M. Borsato ¹ O. Callot ¹ O. Kochebina ¹ J. Lefrançois ¹ F. Machefert ¹ A. Martin Sanchez ¹ Marie Nicol ¹ P. Robbe ¹ M.-H. Schune ¹ M. Teklishyn ¹ A. Vallier ¹ B. Viaud ¹ S. Akar ² E. Aslanides ² J. Cogan ² W. Kanso ² R. Legac ² O. Leroy ² G. Mancinelli ² A. Mordà ^{2, 3} M. Perrin-Terrin ² J. Serrano ² A. Tsaregorodtsev ² L. Beaucourt ⁴ M. Chefdeville ⁴ D. Decamp ⁴ N. Déléage ⁴ Ph. Ghez ⁴ J.-P. Lees ⁴ J.F. Marchand ⁴ M.-N. Minard ⁴ B. Pietrzyk ⁴ W. Qian ⁴ S. t'Jampens ⁴ V. Tisserand ⁴ E. Tournefier ⁴ Ziad Ajaltouni ⁵ M. Baalouch ⁵ E. Cogneras ⁵ O. Deschamps ⁵ I. El Rifai ⁵ M. Grabalosa Gándara ⁵ Pierre Henrard ⁵ M. Hoballah ⁵ R. Lefèvre ⁵ J. Maratas ⁵ S. Monteil ⁵ V. Niess ⁵ Pascal Perret ⁵ Diego Alejandro Roa Romero ⁵

1 LAL - Laboratoire de l'Accélérateur Linéaire

2 CPPM - Centre de Physique des Particules de Marseille

3 CPT - Centre de Physique Théorique - UMR 7332

4 LAPP - Laboratoire d'Annecy de Physique des Particules

5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

Abstract : Three-body $B^+\to p \overline p K^+$ and $B^+\to p \overline p \pi^+$ decays are studied using a data sample corresponding to an integrated luminosity of 3.0 $fb^{-1}$ 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 $B^+\to p \overline p K^+$ 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 $p\overline p$ rest frame yield $A_{\mathrm{FB}}(p \overline p K^+,~m_{p\overline p}<2.85\mathrm{\,Ge\kern -0.1em V\!/}c^2)=0.495\pm0.012~(\mathrm{stat})\pm0.007~(\mathrm{syst})$ and $A_{\mathrm{FB}}(p\overline p \pi^+,~m_{p\overline p}<2.85\mathrm{\,Ge\kern -0.1em V\!/}c^2)=-0.409\pm0.033~(\mathrm{stat})\pm0.006~(\mathrm{syst})$. In addition, the branching fraction of the decay $B^+\to\kern 0.1em\overline{\kern -0.1em\Lambda}(1520)p$ is measured to be $\mathcal{B}(B^+ \to \kern 0.1em\overline{\kern -0.1em\Lambda}(1520)p)=(3.15\pm0.48~(\mathrm{stat})\pm0.07~(\mathrm{syst})\pm0.26~(\mathrm{BF}))\times 10^{-7}$, where BF denotes the uncertainty on secondary branching fractions.

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Journal articles

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Physics [physics] / High Energy Physics - Experiment [hep-ex]

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http://hal.in2p3.fr/in2p3-01038106
Contributor : Sabine Starita <>
Submitted on : Wednesday, July 23, 2014 - 11:52:04 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:14 PM

Evidence for CP violation in $B^+\to p \overline p K^+$ decays

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Evidence for CP violation in $B^+\to p \overline p K^+$ decays

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