Measurements of the branching fractions of $B^{+} \to p \bar p K^{+}$ decays

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) , B. Viaud (1) , E. Ben-Haim (2) , M. Benayoun (2) , P. David (2) , L. del Buono (2) , A. Martens (2) , D.A. Milanes , F. Polci (2) , C. Adrover (3) , E. Aslanides (3) , J. Cogan (3) , R. Legac (3) , O. Leroy (3) , G. Mancinelli (3) , E. Maurice (3) , M. Perrin-Terrin (3) , M. Sapunov (3) , J. Serrano (3) , A. Tsaregorodtsev (3) , I. de Bonis (4) , D. Decamp (4) , Ph. Ghez (4) , P. Hopchev (4) , J.-P. Lees (4) , I.V. Machikhiliyan (4) , M.-N. Minard (4) , B. Pietrzyk (4) , W. Qian (4) , S. t'Jampens (4) , V. Tisserand (4) , E. Tournefier (4) , Ziad Zj Ajaltouni (5) , E. Cogneras (5) , O. Deschamps (5) , I. El Rifai (5) , M. Grabalosa Gándara (5) , Pierre Henrard (5) , M. Hoballah (5) , R. Lefèvre (5) , L. Li Gioi (5) , S. Monteil (5) , V. Niess (5) , Pascal Perret (5) , Diego Alejandro Roa Romero (5) , Krzysztof Grzegorz Sobczak (5)

1 LAL - Laboratoire de l'Accélérateur Linéaire
2 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3 CPPM - Centre de Physique des Particules de Marseille
4 LAPP - Laboratoire d'Annecy de Physique des Particules
5 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

The branching fractions of the decay $B^{+} \to p \bar p K^{+}$ for different intermediate states are measured using data, corresponding to an integrated luminosity of $1.0 fb^{-1}$, collected by the LHCb experiment. The total branching fraction, its charmless component $(M_{p\bar p} <2.85 {GeV/}c^{2})$ and the branching fractions via the resonant $c\bar c$ states $\eta_{c}(1S)$ and $\psi(2S)$ relative to the decay via a $J/\psi$ intermediate state are \begin{align*} \frac{{\mathcal B}(B^{+} \to p \bar p K^{+})_{total}}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 4.91 \pm 0.19 \, {(\rm stat)} \pm 0.14 \, {(\rm syst)},\\ \frac{{\mathcal B}(B^{+} \to p \bar p K^{+})_{M_{p\bar p} <2.85 {GeV/}c^{2}}}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 2.02 \pm 0.10 \, {(\rm stat)}\pm 0.08 \, {(\rm syst)},\\ \frac{{\mathcal B} (B^{+} \to \eta_{c}(1S) K^{+} \to p \bar p K^{+})}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})} = & \, 0.578 \pm 0.035 \, {(\rm stat)} \pm 0.027 \, {(\rm syst)},\\ \frac{{\mathcal B} (B^{+} \to \psi(2S) K^{+} \to p \bar p K^{+})}{{\mathcal B}(B^{+} \to J/\psi K^{+} \to p \bar p K^{+})}=& \, 0.080 \pm 0.012 \, {(\rm stat)} \pm 0.009 \, {(\rm syst)}.\\ \end{align*} Upper limits on the $B^{+}$ branching fractions into the $\eta_{c}(2S)$ meson and into the charmonium-like states X(3872) and X(3915) are also obtained.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Measurements of the branching fractions of $B^{+} \to p \bar p K^{+}$ decays. European Physical Journal C: Particles and Fields, 2013, 73, pp.2462. ⟨10.1140/epjc/s10052-013-2462-2⟩. ⟨in2p3-00805899⟩