Search for the decay $B^0 \rightarrow \phi \phi$

TL;DR

This paper reports a search for the rare decay $B^0 ightarrow phi phi$ using LHCb data, setting a new upper limit on its branching fraction, which improves previous constraints by a factor of two.

Contribution

The study provides the most stringent upper limit to date on the branching fraction of $B^0 ightarrow phi phi$, using extensive collision data from the LHCb detector.

Findings

No significant signal observed.

Upper limit on branching fraction set at $1.3 imes 10^{-8}$ (90% CL).

Improved the previous upper limit by a factor of two.

Abstract

A search for the decay $B^0 \rightarrow \phi \phi$ is made using $pp$ collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of $9$ fb$^{-1}$. No significant signal is observed, and an upper limit on the branching fraction of $1.3~(1.4)\times 10^{-8}$ at $90 ~(95) \%$ confidence level is set. This result supersedes the previous LHCb study and improves the upper limit by a factor of two.