Study of the decay $B_s^0 \rightarrow J/\psi f_2^{\prime}(1525)$ in $\mu^+ \mu^- K^+K^-$ final states

TL;DR

This paper reports evidence for the decay of B_s^0 into J/psi and f_2' (1525) meson, measuring its relative branching fraction using data from proton-antiproton collisions at Fermilab.

Contribution

It provides the first evidence for the decay B_s^0 → J/psi f_2' (1525) and measures its relative branching fraction compared to B_s^0 → J/psi φ.

Findings

Evidence for B_s^0 → J/psi f_2' (1525) decay

Relative branching fraction measured as 0.19 ± 0.05 (stat) ± 0.04 (syst)

Analysis of K^+K^- invariant mass and spin states

Abstract

We investigate the decay $B_s^0 \rightarrow J/\psi K^+ K^-$ for invariant masses of the $K^+K^-$ pair in the range $1.35<M(K^+K^-)<2$ GeV. The data sample corresponds to an integrated luminosity of 10.4 fb$^{-1}$ of $p \bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV accumulated with the D0 detector at the Fermilab Tevatron collider. From the study of the invariant mass and spin of the $K^+K^-$ system, we find evidence for the two-body decay \bsf and measure the relative branching fraction of the decays \bsf and \bsdec to be $R_{f_2^{\prime}/\phi} = 0.19 \pm 0.05 \rm \thinspace{(stat)} \pm 0.04 \rm \thinspace{(syst)}$.