First Observation of the Decay B0s→K−μ+νμ and a Measurement of |Vub|/|Vcb|

LHCb collaboration

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The first observation of the suppressed semileptonic B0s→K−μ+νμ decay is reported. Using a data sample recorded in pp collisions in 2012 with the LHCb detector, corresponding to an integrated luminosity of 2  fb−1, the branching fraction B(B0s→K−μ+νμ) is measured to be [1.06±0.05(stat)±0.08(syst)]×10−4, where the first uncertainty is statistical and the second one represents the combined systematic uncertainties. The decay B0s→D−sμ+νμ, where D−s is reconstructed in the final state K+K−π−, is used as a normalization channel to minimize the experimental systematic uncertainty. Theoretical calculations on the form factors of the B0s→K− and B0s→D−s transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcb| at low and high B0s→K− momentum transfer.
Original languageEnglish
Article number081804
Pages (from-to)1-11
Number of pages11
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 25 Feb 2021


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