Studies of the decays B+→pp¯h+ and observation of B+→Λ¯(1520)p

LHCb Collaboration; et al; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A (2013). Studies of the decays B+→pp¯h+ and observation of B+→Λ¯(1520)p. Physical Review D (Particles, Fields, Gravitation and Cosmology), 88:052015.

Abstract

Dynamics and direct CP 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 pp¯ rest frame is measured. No significant CP asymmetry in B+→pp¯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ¯¯(1520)(→K+p¯)p near the K+p¯ threshold and measure B(B+→Λ¯¯(1520)p)=(3.9+1.0−0.9(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

Abstract

Dynamics and direct CP 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 pp¯ rest frame is measured. No significant CP asymmetry in B+→pp¯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ¯¯(1520)(→K+p¯)p near the K+p¯ threshold and measure B(B+→Λ¯¯(1520)p)=(3.9+1.0−0.9(stat)±0.1(syst)±0.3(BF))×10−7, where BF denotes the uncertainty on secondary branching fractions.

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