A Precision Determination of the D^0 Mass

TL;DR

This paper reports a highly precise measurement of the D^0 meson mass using e+e- collision data, providing insights into the binding energy of the X(3872) molecule candidate.

Contribution

The study presents the most precise D^0 mass measurement to date, refining the understanding of the X(3872) molecular structure.

Findings

D^0 mass measured as 1864.847±0.150(stat)±0.095(syst) MeV

Determined the binding energy of X(3872) as 0.6±0.6 MeV

Enhanced constraints on the molecular nature of X(3872)

Abstract

A precision measurement of the D^0 meson mass has been made using ~281 pb-1 of e+e- annihilation data taken with the CLEO-c detector at the psi(3770) resonance. The exclusive decay D^0 -> (Ks phi) has been used to obtain M(D^0)=1864.847+-0.150(stat)+-0.095(syst) MeV. This corresponds to M(D^0 D^*0)=3871.81+-0.36 MeV, and leads to a well-constrained determination of the binding energy of the proposed (D^0 D^*0) molecule X(3872), E_b=0.6+-0.6 MeV.