Charmonium spectrum from quenched QCD with overlap fermions

S. Tamhankar, A. Alexandru, Y. Chen, S. J. Dong, T. Draper, I. Horváth, F. X. Lee, K. F. Liu, N. Mathur, J. B. Zhang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We present the first study of the charmonium spectrum using overlap fermions, on quenched configurations. Simulations are performed on 163 × 72 lattices, with Wilson gauge action at β = 6.3345. We demonstrate that we have discretization errors, as indicated by the dispersion relation, at about 5%. We obtain 88(4) MeV for the 1S hyperfine splitting using the r0 scale, and 121(6) MeV using the (1 over(P, ̄) - 1 over(S, ̄)) scale. This Letter should encourage the pursuit of using the same chiral fermions for both heavy and light quarks on the same lattice.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1
StatePublished - Jun 29 2006

Bibliographical note

Funding Information:
This work is supported in part by the U.S. Department of Energy under grants DE-FG05-84ER40154 and DE-FG02-95ER40907. The computing resources at NERSC (operated by DOE under DE-AC03-76SF00098) are also acknowledged. Y. Chen and S.J. Dong are partly supported by NSFC (#10235040 and #10075107).

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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