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Observation of charmless baryonic decays $B^0_{(s)} \to p\overline{p}h^+h^{\prime -}$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Observation of charmless baryonic decays $B^0_{(s)} \to p\overline{p}h^+h^{\prime -}$. Physical Review. D, Particles, fields, gravitation and cosmology, D96(5):051103.

Abstract

Decays of $B^0$ and $B^0_s$ mesons to the charmless baryonic final states $p\overline{p}h^+h^{\prime -}$, where $h$ and $h^{\prime}$ 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 and 8 TeV, corresponding to an integrated luminosity of 3  fb$^{−1}$. Four-body charmless baryonic $B^0_s$ decays are observed for the first time. The decays $B^0_s \to p\overline{p}K^+K^-, B^0_s \to p\overline{p}K^{\pm}\pi^{\mp}, B^0 \to p\overline{p}K^{\pm}\pi^{\mp}$ and $B^0 \to p\overline{p}\pi^+\pi^-$ are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the $B^0 \to p\overline{p}K^+K^-$ decay and an upper limit is set on the branching fraction for $B^0_s \to p\overline{p}\pi^+\pi^-$. Branching fractions in the kinematic region $m(p\overline{p}) < 2850  MeV/c^2$ are measured relative to the $B^0 \to J/\psi(\to p\overline{p})K^*(892)^0$ channel.

Abstract

Decays of $B^0$ and $B^0_s$ mesons to the charmless baryonic final states $p\overline{p}h^+h^{\prime -}$, where $h$ and $h^{\prime}$ 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 and 8 TeV, corresponding to an integrated luminosity of 3  fb$^{−1}$. Four-body charmless baryonic $B^0_s$ decays are observed for the first time. The decays $B^0_s \to p\overline{p}K^+K^-, B^0_s \to p\overline{p}K^{\pm}\pi^{\mp}, B^0 \to p\overline{p}K^{\pm}\pi^{\mp}$ and $B^0 \to p\overline{p}\pi^+\pi^-$ are observed with a significance greater than 5 standard deviations; evidence at 4.1 standard deviations is found for the $B^0 \to p\overline{p}K^+K^-$ decay and an upper limit is set on the branching fraction for $B^0_s \to p\overline{p}\pi^+\pi^-$. Branching fractions in the kinematic region $m(p\overline{p}) < 2850  MeV/c^2$ are measured relative to the $B^0 \to J/\psi(\to p\overline{p})K^*(892)^0$ channel.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:06 Feb 2018 16:12
Last Modified:19 Feb 2018 10:45
Publisher:American Physical Society
ISSN:1550-7998
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevD.96.051103

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