Radial and orbital excitation energies of charmonium

Abstract

The charmonium system has several excited states below the energy threshold for decay into $D$ and $\bar{D}$ mesons, which can in principle be studied accurately in lattice QCD. Studies that include many states in the spectrum have typically only been done at one value of the lattice spacing and with relatively heavy light quarks in the sea. Here we give preliminary results for radial and orbital excitation energies for charmonium from a calculation on 2+1+1 MILC configurations at multiple lattice spacings and including physical values for $u/d$ quark masses. We use the HISQ formulation for $c$ to obtain small discretisation errors and smeared operators to improve excited state overlap.

arXiv comment7 pages, 4 figures. Presented at the 32nd International Symposium on Lattice Field Theory (Lattice 2014), 23-28 June 2014, New York, USA

References in corpus (3)

• Highly Improved Staggered Quarks on the Lattice, with Applications to Charm Physics
• Lattice QCD ensembles with four flavors of highly improved staggered quarks
• Excited and exotic charmonium spectroscopy from lattice QCD

Cited by in corpus (6)

• Excited and exotic charmonium, $D_s$ and $D$ meson spectra for two light quark masses from lattice QCD
• Masses of $D$ mesons, $D_s$ mesons and charmonium states from twisted mass lattice QCD
• Continuum limit of the $D$ meson, $D_s$ meson and charmonium spectrum from $N_f=2+1+1$ twisted mass lattice QCD
• LQCD: Flavor Physics and Spectroscopy
• Mass spectra of mesons containing charm quarks - continuum limit results from twisted mass fermions
• Vector current renormalisation in momentum subtraction schemes using the HISQ action