Andrei Alexandru

Glueball spectrum and matrix elements on anisotropic lattices

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.

Study of pentaquarks on the lattice with overlap fermions

We present a quenched lattice QCD calculation of spin-

Strangeness and charmness content of the nucleon from overlap fermions on 2+1-flavor domain-wall fermion configurations

1/2

Lattice QCD at finite density via a new canonical approach

five-quark states with

Resonance parameters of the rho-meson from asymmetrical lattices

uudd\overline{s}

π N and Strangeness Sigma Terms at the Physical Point with Chiral Fermions

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

Sign problem and Monte Carlo calculations beyond Lefschetz thimbles

I=0

Inherently global nature of topological charge fluctuations in QCD

or

The negativity of the overlap-based topological charge density correlator in pure-glue QCD and the non-integrable nature of its contact part

I=1

Rho resonance parameters from lattice QCD

. The states we found are consistent with