D and D_s meson spectroscopy from lattice QCD

TL;DR

This study uses lattice QCD to analyze the spectrum of D and D_s mesons, including excited states, and compares results with experimental data, revealing good agreement for charmonium but discrepancies in some heavy-light channels.

Contribution

It provides new lattice QCD calculations of D and D_s meson spectra, including excited states, using the Fermilab method and variational analysis on 2+1 flavor configurations.

Findings

Charmonium spectrum agrees with experiment

Discrepancies observed in heavy-light channels with scattering states

Successful extraction of excited states using variational method

Abstract

We present results for the low-lying spectrum of D and D_s mesons from a lattice QCD calculation on 2+1 flavor Clover-Wilson configurations generated by the PACS-CS collaboration. In particular S- and P-wave states of charmed and charmed-strange mesons are explored for pion masses down to 156MeV. For the heavy quark, the Fermilab method is employed. In addition to ground states, some excited states are extracted using the variational method. To check our setup, calculations of the charmonium spectrum are also carried out. For charmonium, the low-lying spectrum agrees favorably with experiment. For heavy-strange and heavy-light systems substantial differences in comparison to experiment values remain in channels with nearby scattering states.