EPJ Web of Conferences (Jan 2018)

Charmonium resonances on the lattice

  • Bali Gunnar,
  • Collins Sara,
  • Mohler Daniel,
  • Padmanath M.,
  • Piemonte Stefano,
  • Prelovsek Sasa,
  • Weishäupl Simon

DOI
https://doi.org/10.1051/epjconf/201817505020
Journal volume & issue
Vol. 175
p. 05020

Abstract

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The nature of resonances and excited states near decay thresholds is encoded in scattering amplitudes, which can be extracted from single-particle and multiparticle correlators in finite volumes. Lattice calculations have only recently reached the precision required for a reliable study of such correlators. The distillation method represents a significant improvement insofar as it simplifies quark contractions and allows one to easily extend the operator basis used to construct interpolators. We present preliminary results on charmonium bound states and resonances on the Nf = 2+1 CLS ensembles. The long term goal of our investigation is to understand the properties of the X resonances that do not fit into conventional models of quark-antiquark mesons. We tune various parameters of the distillation method and the charm quark mass. As a first result, we present the masses of the ground and excited states in the 0++ and 1−− channels