Light Quark Mass Dependence in Heavy Quarkonium Physics
Light Quark Mass Dependence in Heavy Quarkonium Physics
The issue of chiral extrapolations in heavy quarkonium systems is discussed. We show that the light quark mass dependence of the properties of heavy quarkonia is not always suppressed. For quarkonia close to an open flavor threshold, even a nonanalytic chiral extrapolation is needed. Both these nontrivial facts are demonstrated …