First Observation of a Baryonic B[superscript 0][subscript s]

We report the first observation of a baryonic B[superscript 0][subscript s] decay, B[subscript 0][subscript s] →p[bar over Λ]K[superscript -], using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3....

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Bibliographic Details
Main Authors: Boettcher, Thomas Julian, Ilten, Philip J, Williams, Michael
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Published: American Physical Society (APS) 2018
Online Access:http://hdl.handle.net/1721.1/116667
https://orcid.org/0000-0001-5534-1732
https://orcid.org/0000-0001-8285-3346
Description
Summary:We report the first observation of a baryonic B[superscript 0][subscript s] decay, B[subscript 0][subscript s] →p[bar over Λ]K[superscript -], using proton-proton collision data recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb[superscript -1]. The branching fraction is measured to be B(B[superscript 0][subscript s] →p[bar over Λ]K[superscript -])+B(B[subscript 0][subscript s]→[bar over p]ΛK[superscript +])=[5.46±0.61±0.57±0.50(B)±0.32(f[subscript s]/f[subscript d])]×10[superscript -6], where the first uncertainty is statistical and the second systematic, the third uncertainty accounts for the experimental uncertainty on the branching fraction of the B[superscript 0]→p[bar over Λ]π[superscript -] decay used for normalization, and the fourth uncertainty relates to the knowledge of the ratio of b-quark hadronization probabilities f[subscript s]/f[subscript d].