Ivan Horvath

Y. Chen; Andrei Alexandru; Shao-Jing Dong; Terrence Draper; Ivan Horvath; Frank X. Lee; Keh-Fei Liu; N. Mathur; Colin Morningstar; Mike Peardon; S. Tamhankar; B.-L. Young; Jian-Bo Zhang

The glueball-to-vacuum matrix elements of local gluonic operators in scalar, tensor, and pseudoscalar channels are investigated numerically on several anisotropic lattices with the spatial lattice spacing ranging from 0.1-0.2 fm. These matrix elements are needed to predict the glueball branching ratios in J/{psi} radiative decays which will help identify the glueball states in experiments. Two types of improved local gluonic operators are constructed for a self-consistent check and the finite-volume effects are studied. We find that lattice spacing dependence of our results is very weak and the continuum limits are reliably extrapolated, as a result of improvement of the lattice gauge action and local operators. We also give updated glueball masses with various quantum numbers.

N. Mathur; Frank X. Lee; Andrei Alexandru; C. Bennhold; Y. C. Chen; Shao-Jing Dong; Terrence Draper; Ivan Horvath; Keh-Fei Liu; S. Tamhankar; Jian-Bo Zhang

We present a quenched lattice QCD calculation of spin-

Andrei Alexandru; M. Faber; Ivan Horvath; Keh-Fei Liu

1/2

Ivan Horvath; Shao-Jing Dong; Terrence Draper; Frank X. Lee; Keh-Fei Liu; N. Mathur; J. Zhang; H. Thacker

five-quark states with

Y. Chen; Shao-Jing Dong; Terrence Draper; Ivan Horvath; Frank X. Lee; Keh-Fei Liu; N. Mathur; J. Zhang

uudd\overline{s}

Ivan Horvath; Nathan Isgur; John McCune; H. Thacker

quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either

Ivan Horvath; Andrei Alexandru; J. Zhang; Y. C. Chen; Shao-Jing Dong; Terrence Draper; Frank X. Lee; Keh-Fei Liu; N. Mathur; S. Tamhankar; H. Thacker

I=0

Ivan Horvath; Andrei Alexandru; J. Zhang; Y. C. Chen; Shao-Jing Dong; Terrence Draper; Keh-Fei Liu; N. Mathur; S. Tamhankar; H. Thacker

or

Ivan Horvath; Shao-Jing Dong; Terrence Draper; Nathan Isgur; Frank X. Lee; Keh-Fei Liu; J. McCune; H. Thacker; J. Zhang

I=1

Ivan Horvath

. The states we found are consistent with