Decays of B-0, B-s(0) mesons to the charmless baryonic final states p (p) over barh(+)h'(-) where h, h' each denote a kaon or a pion are searched for using the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies of 7, 8 TeV corresponding to an integrated luminosity of 3 fb(-1). Four-body charmless baryonic B-s(0) decays are observed for the first time. The decays B-s(0) -> p (p) over barK(+) K- B-s(0) -> p (p) over barK(+/-) pi(inverted perpendicular) B-0 -> p (p) over barK(+) pi(inverted perpendicular), B-0 -> p (p) over bar pi(+) pi(-) are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the B-0 -> p (p) over barK(+) K- decay, an upper limit is set on the branching fraction for B-s(0) -> p (p) over bar pi(+) pi(-). Branching fractions in the kinematic region m(p (p) over bar) < 2850 MeV/c(2) are measured relative to the B-0 -> J/psi(-> p<(p)over bar>) K* (892)(0) channel.

Observation of charmless baryonic decays B-(s)(0) -> p(p)over-barh plus h '(-)

Dettori F.;Lai A.;Manca G.;Oldeman R.;Saitta B.;
2017-01-01

Abstract

Decays of B-0, B-s(0) mesons to the charmless baryonic final states p (p) over barh(+)h'(-) where h, h' each denote a kaon or a pion are searched for using the LHCb detector. The analysis is based on a sample of proton-proton collision data collected at center-of-mass energies of 7, 8 TeV corresponding to an integrated luminosity of 3 fb(-1). Four-body charmless baryonic B-s(0) decays are observed for the first time. The decays B-s(0) -> p (p) over barK(+) K- B-s(0) -> p (p) over barK(+/-) pi(inverted perpendicular) B-0 -> p (p) over barK(+) pi(inverted perpendicular), B-0 -> p (p) over bar pi(+) pi(-) are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the B-0 -> p (p) over barK(+) K- decay, an upper limit is set on the branching fraction for B-s(0) -> p (p) over bar pi(+) pi(-). Branching fractions in the kinematic region m(p (p) over bar) < 2850 MeV/c(2) are measured relative to the B-0 -> J/psi(-> p<(p)over bar>) K* (892)(0) channel.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/240141
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