Evidence for the decay $B^0_s\to\phi\eta'$

TL;DR

The LHCb experiment provides evidence for the rare decay $B^0_s o ext{phi eta'}$ with a significance of 3.5 sigma, measuring its branching fraction relative to $B^0_s o ext{phi phi}$.

Contribution

First evidence for the decay $B^0_s o ext{phi eta'}$ with a quantified branching fraction using LHCb data from 2011-2018.

Findings

Evidence at 3.5 sigma significance for $B^0_s o ext{phi eta'}$.

Measured branching ratio relative to $B^0_s o ext{phi phi}$ as $(3.56 imes 10^{-2})$.

Branching fraction of $B^0_s o ext{phi eta'}$ is $(0.66 imes 10^{-6})$.

Abstract

Using a dataset corresponding to an integrated luminosity of $9 \,\textrm{fb}^{-1}$ collected in proton-proton collisions between 2011 and 2018 by the LHCb experiment, evidence is found for the decay $B^0_s\to\phi\eta'$ with $3.5 \sigma$ significance. The branching ratio relative to the $B^0_s\to\phi\phi$ decay is determined to be $R=(3.56 \pm 0.79\pm 0.18\pm 0.06)\times10^{-2}$. This corresponds to a branching fraction, $B(B^0_s\to\phi\eta')=(0.66 \pm 0.15 \pm 0.03 \pm 0.02) \times 10^{-6}$ where, in both cases, the first uncertainty is statistical, the second systematic, and the third due to external branching fractions.