A search for the exotic meson $X(5568)$ with the Collider Detector at Fermilab

TL;DR

This study conducted a search for the exotic meson $X(5568)$ in proton-antiproton collision data but found no evidence, setting an upper limit on its production rate relative to $B^0_s$ mesons.

Contribution

The paper provides the first search for the $X(5568)$ meson in $par p$ collisions and establishes an upper limit on its production, contributing to understanding its existence.

Findings

No evidence for $X(5568)$ observed.

Set an upper limit of 6.7% on its production fraction.

Contributes to the ongoing investigation of exotic mesons.

Abstract

A search for the exotic meson $X(5568)$ decaying into the $B^0_s \pi^{\pm}$ final state is performed using data corresponding to $9.6 \textrm{fb}^{-1}$ from $p{\bar p}$ collisions at $\sqrt{s} = 1960$ GeV recorded by the Collider Detector at Fermilab. No evidence for this state is found and an upper limit of 6.7\% at the 95\% confidence level is set on the fraction of $B^0_s$ produced through the $X(5568) \rightarrow B^0_s \, \pi^{\pm}$ process.