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.
2013
R., Aaij; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; S., Ali; G., Alkhazov; P., Alva...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2090212
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