First observation of the decay $B_s^0 \to K^-\mu^+\nu_\mu$ and Measurement of $|V_{ub}|/|V_{cb}|$ - INSPIRE

DataBETA

First observation of the decay $B_s^0 \to K^-\mu^+\nu_\mu$ and Measurement of $|V_{ub}|/|V_{cb}|$

LHCb

Collaboration

Dec 9, 2020

11 pages

Published in:

Phys.Rev.Lett. 126 (2021) 8, 081804

Published: Feb 25, 2021

e-Print:

2012.05143 [hep-ex]

DOI:

10.1103/PhysRevLett.126.081804

PDG:

{{\mathit B}_{{{s}}}^{0}}

\rightarrow

{{\mathit D}_{{{s}}}^{-}}{{\mathit \mu}^{+}}{{\mathit \nu}_{{{\mu}}}}

Report number:

LHCb-PAPER-2020-038,
CERN-EP-2020-224,
CERN-EP-2020-224

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (APS)

The first observation of the suppressed semileptonic Bs0→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(Bs0→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 Bs0→Ds-μ+νμ, where Ds- 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 Bs0→K- and Bs0→Ds- transitions are employed to determine the ratio of the Cabibbo-Kobayashi-Maskawa matrix elements |Vub|/|Vcb| at low and high Bs0→K- momentum transfer.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-038.html

Elementary Particles and Fields
p p: scattering
p p: colliding beams
B/s0: semileptonic decay
momentum transfer
B/s0: branching ratio: measured
B/s0: form factor
statistical
suppression
CKM matrix

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