Searching $B_c^\ast$ via conservation laws

TL;DR

This paper proposes two methods based on conservation laws to distinguish and detect the $B_c^{ ext{*}+}$ meson in experiments, highlighting promising channels for observation at LHC and future colliders.

Contribution

It introduces novel methods utilizing angular momentum and kinematic constraints to identify $B_c^{ ext{*}+}$, and provides predicted branching ratios for experimental detection.

Findings

Nonzero helicity of $J/\psi$ indicates $B_c^{\text{*}+}$ presence.

$B_c^{\text{*}+} \to B^+ \phi$ branching ratio estimated as $(7.0 \pm 3.0) \times 10^{-9}$.

$B_c^{\text{*}+}$ can be observed at LHC and future colliders via proposed channels.

Abstract

To distinguish $B_c^{\ast +}(1^3S_1)$ and $B_c^+(1^1S_0)$ in the experiments, we propose two methods based on the conservation laws. I. From the angular momentum conservation, a nonzero helicity of $J/\psi$ of $B_c^{(\ast)+ } \to J/\psi \pi^+$ would be an evidence of $B_c^{\ast +}$. II. Since $B_c^+ \to B^+ \phi$ is kinematically forbidden, $ B_c^{\ast +} \to B^+ \phi$ provides a clean channel to probe $B_c^{\ast +}$\,. Particularly, our results show that $B_c^{\ast +}$ is promising to be observed at LHC via $B_c^{(\ast)+} \to J/\psi \pi^+$. On the other hand, we find that ${\cal B} ( B_c^{\ast+} \to B^+ \phi) = ( 7.0 \pm 3.0 ) \times 10 ^{-9} $, which is also feasible to be measured at the forthcoming experiments at HL-LHC and FCC-hh.