Observation of the ${\Lambda }_b^0\to \Lambda \varphi$ decay

Abstract

The ${\Lambda }_b^0\to \Lambda \varphi$ decay is observed using data corresponding to an integrated luminosity of 3.0fb${}^{-1}$ recorded by the LHCb experiment. The decay proceeds at leading order via a $b\to s\bar{s}s$ loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of $5.9$ standard deviations. The value of the branching fraction is measured to be $(5.18\pm 1.04\pm 0.35{}_{-0.62}^{+0.67})\times 10^{-6}$, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-002.html - modified to match minor changes in the published version, corrected to add additional factor in the ratio of branching fractions

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