First evidence for the two-body charmless baryonic decay $B^0 \to p \bar{p}$

R. Aaij; Y. Amhis; S. Barsuk; O. Callot; J. He; O. Kochebina; J. Lefrançois; F. Machefert; A. Martin Sanchez; M. Nicol; P. Robbe; M.-H. Schune; M. Teklishyn; A. Vallier; B. Viaud; E. Ben-Haim; M. Benayoun; P. David; L. del Buono; A. Martens; D.A. Milanes; F. Polci; I. de Bonis; D. Decamp; N. Déléage; Ph. Ghez; J.-P. Lees; I.V. Machikhiliyan; 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; L. Li Gioi; J. Maratas; S. Monteil; V. Niess; Pascal Perret; Diego Alejandro Roa Romero; C. Adrover; E. Aslanides; J. Cogan; W. Kanso; R. Legac; O. Leroy; G. Mancinelli; E. Maurice; A. Mordà; M. Perrin-Terrin; M. Sapunov; J. Serrano; A. Tsaregorodtsev

doi:10.1007/JHEP10(2013)005

Journal articles

First evidence for the two-body charmless baryonic decay $B^0 \to p \bar{p}$

R. Aaij Y. Amhis ¹ S. Barsuk ¹ O. Callot ¹ J. He ¹ O. Kochebina ¹ J. Lefrançois ¹ F. Machefert ¹ A. Martin Sanchez ¹ M. Nicol ¹ P. Robbe ¹ M.-H. Schune ¹ M. Teklishyn ¹ A. Vallier ¹ B. Viaud ¹ E. Ben-Haim ² M. Benayoun ² P. David ² L. del Buono ² A. Martens ² D.A. Milanes ² F. Polci ² I. de Bonis ³ D. Decamp ³ N. Déléage ³ Ph. Ghez ³ J.-P. Lees ³ I.V. Machikhiliyan ³ M.-N. Minard ³ B. Pietrzyk ³ W. Qian ³ S. t'Jampens ³ V. Tisserand ³ E. Tournefier ³ Ziad Ajaltouni ⁴ M. Baalouch ⁴ E. Cogneras ⁴ O. Deschamps ⁴ I. El Rifai ⁴ M. Grabalosa Gándara ⁴ Pierre Henrard ⁴ M. Hoballah ⁴ R. Lefèvre ⁴ L. Li Gioi ⁴ J. Maratas ⁴ S. Monteil ⁴ V. Niess ⁴ Pascal Perret ⁴ Diego Alejandro Roa Romero ⁴ C. Adrover ⁵ E. Aslanides ⁵ J. Cogan ⁵ W. Kanso ⁵ R. Legac ⁵ O. Leroy ⁵ G. Mancinelli ⁵ E. Maurice ⁵ A. Mordà ⁵ M. Perrin-Terrin ⁵ M. Sapunov ⁵ J. Serrano ⁵ A. Tsaregorodtsev ⁵

1 LAL - Laboratoire de l'Accélérateur Linéaire

2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies

3 LAPP - Laboratoire d'Annecy de Physique des Particules

4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

5 CPPM - Centre de Physique des Particules de Marseille

Abstract : The results of a search for the rare two-body charmless baryonic decays $B^0 \to p \bar{p}$ and $B_s^0 \to p \bar{p}$ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb$^{-1}$, of $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of $B^0 \to p \bar{p}$ candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic $B^0$ decay. No significant $B_s^0 \to p \bar{p}$ signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions are {eqnarray} \cal{B}(B^0 \to p \bar{p}) & = & (1.47 \,^{+0.62}_{-0.51} \,^{+0.35}_{-0.14}) \times 10^{-8} \,, *{0.3cm} \cal{B}(B_s^0 \to p \bar{p}) & = & (2.84 \,^{+2.03}_{-1.68} \,^{+0.85}_{-0.18}) \times 10^{-8} \,, {eqnarray} where the first uncertainty is statistical and the second is systematic.

Document type :

Journal articles

Domain :

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

Complete list of metadatas

http://hal.in2p3.fr/in2p3-00904575
Contributor : Sabine Starita <>
Submitted on : Thursday, November 14, 2013 - 5:08:10 PM
Last modification on : Wednesday, January 6, 2021 - 6:22:02 PM

First evidence for the two-body charmless baryonic decay $B^0 \to p \bar{p}$

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First evidence for the two-body charmless baryonic decay $B^0 \to p \bar{p}$

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