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)=(3.9-0.9+1.0(stat)±0.1(syst)±0.3(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.
Studies of the decays B^{+}→pp[over ¯]h^{+} and observation of B^{+}→Λ[over ¯](1520)p
BALDINI, Wander;BOZZI, Concezio;FIORE, Marco;SAVRIE', Mauro;
2013
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)=(3.9-0.9+1.0(stat)±0.1(syst)±0.3(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.