Observation of a Narrow Meson Decaying to Ds pi0 gamma at a Mass of 2.458 GeV/c^2

TL;DR

This paper reports the discovery of a narrow meson state, DsJ(2458)+, at 2458 MeV/c^2, observed through its decay to Ds pi0 gamma, providing insights into its decay modes and mass measurements.

Contribution

The study provides the first observation of the DsJ(2458)+ meson and details its decay properties and mass, enhancing understanding of charm-strange meson spectroscopy.

Findings

Observation of a narrow DsJ(2458)+ state at 2458 MeV/c^2.

Decay predominantly through Ds*(2112)+ pi0 rather than DsJ*(2317)+ gamma.

Measured mass of DsJ*(2317)+ as 2317.3 MeV/c^2.

Abstract

A narrow state, which we label DsJ(2458)+, with mass 2458.0 +/- 1.0(stat.) +/- 1.0(syst.) MeV/c^2, is observed in the inclusive Ds+ pi0 \gamma$ mass distribution in 91 fb-1 of e^+e^- annihilation data recorded by the BABAR detector at the PEP-II asymmetric-energy e^+e^- storage ring. The observed width is consistent with the experimental resolution. The data favor decay through Ds*(2112)+ pi0 rather than through DsJ*(2317)+ gamma. An analysis of Ds+ pi0 data accounting for the influence of the DsJ(2458)+ produces a DsJ*(2317)+ mass of 2317.3 +/- 0.4(stat.) +/- 0.8(syst.) MeV/c^2.