$Z_{cs}^+$ production in the $B^+$ decays process

TL;DR

This paper investigates the production of the exotic $Z_{cs}^+$ state in $B^+$ decays via meson loops, estimating branching ratios and proposing experimental searches at Belle II and LHCb.

Contribution

It introduces a meson loop mechanism analysis for $Z_{cs}^+$ production in $B^+$ decays using effective Lagrangian, providing branching ratio estimates and experimental suggestions.

Findings

Branching fractions are around 10^{-4}

Ratios are nearly parameter-independent

Proposes $B^+ o J/ heta K^+ heta'$ as a search channel

Abstract

In the present work, we studied the $Z_{cs}^+$ exotic state production in the $B^+$ meson decays through the meson loop mechanism, where the $B^+$ meson decays into an anti-charmed meson and a charmed-strange meson pair, and consequently couples to $Z_{cs}$ and a light meson ($\phi,\rho^0,\omega,\eta,\eta^\prime$, and $\pi^0$) via exchanging a proper charmed or charmed-strange meson. Using the effective Lagrangian approach, we estimated the branching fractions of different channels find them to be on the order of $10^{-4}$ and their ratios are almost independent of the model parameter. The fit fractions of $Z_{cs}^+$ in different $B^+$ decay processes are also estimated, and we propose searching for $Z_{cs}^+$ in the $B^+ \to J/\psi K^+\eta^\prime$ process, which should be accessible to both Belle II and LHCb Collaborations.