Measurement of the B0s→J/ψK∗0 branching fraction and angular amplitudes

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A search for the decay B0s→J/ψK∗0 with K∗0→K−π+ is performed with 0.37 fb−1 of pp collisions at s√ = 7 TeV collected by the LHCb experiment, finding a \Bs→JψK−π+ peak of 114±11 signal events. The K−π+ mass spectrum of the candidates in the B0s peak is dominated by the K∗0 contribution. Subtracting the non-resonant K−π+ component, the branching fraction of \BsJpsiKst is (4.4+0.5−0.4±0.8)×10−5, where the first uncertainty is statistical and the second systematic. A fit to the angular distribution of the decay products yields the \Kst polarization fractions fL=0.50±0.08±0.02 and f∣∣∣∣=0.19+0.10−0.08±0.02.
Original languageEnglish
Pages (from-to)071102
Number of pages1
JournalPhysical Review D, particles, fields, gravitation, and cosmology
Early online date3 Aug 2012
Publication statusPublished - 8 Oct 2012


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