Exclusive Production of $D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ via $e^+ e^-$ Annihilation with Initial-State-Radiation

TL;DR

This study investigates the production of specific charm meson pairs via initial-state radiation in electron-positron collisions near 10.58 GeV, providing insights into charmonium states and their decay modes.

Contribution

It presents the first detailed analysis of $D_s$ meson pair production in ISR events at BaBar, including evidence of known $ ext{ψ}$ resonances and limits on $X(4260)$ decays.

Findings

Evidence of known $ ext{ψ}$ resonances in mass spectra.

Limits set on $X(4260)$ decay branching ratios.

Data collected at 525 fb$^{-1}$ from BaBar.

Abstract

We perform a study of exclusive production of$D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ final states in initial-state-radiation events from $e^+ e^-$ annihilations at a center-of-mass energy near 10.58 GeV, to search for charmonium $1^{--}$ states. The data sample corresponds to an integrated luminosity of 525 $fb^{-1}$ and was recorded by the BaBar experiment at the PEP-II storage ring. The $D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ mass spectra show evidence of the known $\psi$ resonances. Limits are extracted for the branching ratios of the decays $X(4260)\to D^{(*)+}_sD^{(*)-}_s$.