Charmonium resonances on the lattice

Abstract

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.

arXiv comment10 pages, 5 figures, talk and poster presented at the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spain

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Cited by in corpus (3)

• Identifying spin and parity of charmonia in flight with lattice QCD
• Diabatic description of charmoniumlike mesons II: mass corrections and strong decay widths
• Coupled-channel meson-meson scattering in the diabatic framework