Studies of the decays $B^{+}\to p\bar{p}{h}^{+}$ and observation of $B^{+}\to \bar{\Lambda }(1520)p$

Abstract

Dynamics and direct $C\P$ violation in three-body charmless decays of charged $B$ mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0${fb}^{-1}$, collected by the $LHCb$ experiment in $pp$ collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the $p\bar{p}$ rest frame is measured. No significant $C\P$ asymmetry in $B^{+}\to p\bar{p}{K}^{+}$ decay is found in any region of the Dalitz plane. We present the first observation of the decay $B^{+}\to \bar{\Lambda }(1520)(\to K^{+}\bar{p})p$ near the $K^{+}\bar{p}$ threshold and measure $\mathcal{B}(B^{+}\to \bar{\Lambda }(1520)p)=(3.9_{-0.9}^{+1.0}(\mathrm{stat})\pm 0.1(\mathrm{syst})\pm 0.3(\mathrm{BF}))\times 10^{-7}$, where BF denotes the uncertainty on secondary branching fractions.

20 pages, 17 figures

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