14–21 mars 2015
Fuseau horaire Europe/Paris

$|V_{ub}|$ with $\Lambda^{0}_{b} \rightarrow p\ \mu^{-}\bar{\nu}_{\mu} $ decays at LHCb

20 mars 2015, 11:25
15m
Ordinary Experiment Heavy Flavours

Orateur

M. William Sutcliffe (Imperial College London)

Description

A measurement of the ratio of branching fractions between $ \Lambda^0_b \rightarrow p\ \mu^- \bar{\nu} $ and $ \Lambda^0_b \rightarrow \Lambda_c^+ \mu^-\bar{\nu} $ decays is performed using data corresponding to 2fb$^{-1}$ of integrated luminosity, collected by the LHCb detector. This combined with the latest form factor predictions obtained from lattice QCD calculations leads to the first determination of $\vert V_{ub} \vert$ at a hadron collider and in a baryon decay. The measurement achieves a relative precision of 7.3% which is more precise than any existing published exclusive measurements.

Authors

Dr Patrick Owen (Imperial College London) Prof. Ulrik Egede (Imperial College London) M. William Sutcliffe (Imperial College London)

Co-auteur

ckm LHCb (lapp)

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