Observation of the decay B¯s0→χc2K+K− in the ϕ mass region

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Observation of the decay B¯s0→χc2K+K− in the ϕ mass region

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Aaij2018_Article_ObservationOfTheDecayBS0Χc2KKO.pdf

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Date Issued

August 1, 2018

Journal

Journal of High Energy Physics

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Final published version

Abstract

© 2018, The Author(s). The B¯s0→χc2K+K− decay mode is observed and its branching fraction relative to the corresponding χc1 decay mode, in a ±15 MeV/c2 window around the ϕ mass, is found to be ℬ(B¯s0→χc2K+K−)ℬ(B¯s0→χc1K+K−)=(17.1±3.1±0.4±0.9)%, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative χc decays. The decay mode B¯s0→χc1K+K− allows the Bs0 mass to be measured as m(Bs0)=5366.83±0.25±0.27MeV/c2, where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the Bs0 mass is made.[Figure not available: see fulltext.]

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Creative Commons Attribution 4.0 International license

https://creativecommons.org/licenses/by/4.0/

Persistent DSpace Link

https://hdl.handle.net/1721.1/134746

DOI of Published Version

10.1007/JHEP08(2018)191

Observation of the decay B¯s0→χc2<sup>K+</sup><sup>K−</sup> in the ϕ mass region