Abstract

The decay ¯¯¯ B 0 s → J / ψ K + K − is investigated using 0.16     fb − 1 of data collected with the LHCb detector using 7 TeV p p collisions. Although the J / ψ ϕ channel is well known, final states at higher K + K − masses have not previously been studied. In the K + K − mass spectrum we observe a significant signal in the f ′ 2 ( 1525 ) region as well as a nonresonant component. After subtracting the nonresonant component, we find B ( ¯¯¯ B 0 s → J / ψ f ′ 2 ( 1525 ) ) / B ( ¯¯¯ B 0 s → J / ψ ϕ ) = ( 26.4 ± 2.7 ± 2.4 ) %

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Diposit Digital de la Universitat de Barcelona

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oai:diposit.ub.edu:2445/133696Last time updated on 7/9/2019

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