Observation of a new D_sJ meson in B+->D0BD0K+ decays

TL;DR

This paper reports the discovery of a new D_sJ meson with specific mass, width, and spin-parity, observed in B+ decays using data from the Belle detector at KEKB.

Contribution

First observation of a new D_sJ meson in B+ decays, providing precise measurements of its properties and quantum numbers.

Findings

Mass of 2708 MeV/c^2 with uncertainties

Width of 108 MeV/c^2 with uncertainties

Spin-parity assignment of 1^-

Abstract

We report the observation of a new $D_{sJ}$ meson produced in $B^{+} \to \bar{D}^{0} D_{sJ} \to \bar{D}^{0} D^{0} K^{+}$. This state has a mass of $M=2708 \pm 9 ^{+11}_{-10} \rm{MeV}/{\it c}^{2}$, a width $\Gamma = 108 \pm 23 ^{+36}_{-31} ~\rm{MeV}/ {\it c}^{2}$ and a $1^{-}$ spin-parity. The results are based on an analysis of 449 million $B\bar{B}$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider.