New Spectroscopy of Heavy Mesons

TL;DR

This paper reviews recent discoveries of open charm mesons, calculates their decay widths using heavy quark symmetry, and analyzes the X(3872) as a potential $ ext{chi}_{c1}(2P)$ state, aiding quantum number assignments.

Contribution

It provides theoretical decay width calculations for heavy mesons and offers an analysis supporting the identification of X(3872) as a specific charmonium state.

Findings

Decay widths computed using heavy quark limit match experimental data.

X(3872) radiative decays support its identification as $ ext{chi}_{c1}(2P)$.

Comparison helps assign quantum numbers to newly observed mesons.

Abstract

I discuss the most recently discovered open charm mesons, both with and without strangeness. By exploiting the heavy quark limit, strong decay widths of such mesons are computed. Comparison between theoretical predictions and experimental measurements are useful to assign the right quantum numbers to such states. As for hidden charm mesons, I consider the case of X(3872). Analysis of its radiative decays to $J/\psi \gamma$ and $\psi(2S) \gamma$ shows the plausibility of the identification with $\chi_{c1}(2P)$.