S. Choe

Responses of hadrons to the chemical potential at finite temperature

We present a framework to compute the responses of hadron masses to the chemical potential in lattice QCD simulations. As a first trial, the screening mass of the pseudoscalar meson and its first and second responses are evaluated. We present results on a

N* masses from an anisotropic lattice QCD action

16\times 8^2\times 4

Screening mass responses to chemical potential at finite temperature

lattice with two flavors of staggered quarks below and above

Quenched charmonium near the continuum limit

T_c

Lattice tool kit in Fortran90

. The responses to both the isoscalar and isovector chemical potentials are obtained. They show different behavior in the low and the high temperature phases, which may be explained as a consequence of chiral symmetry breaking and restoration, respectively.

Spin-3/2 baryons in lattice QCD

We report N* masses in the spin 3/2 sector from a highly-improved anisotropic action. States with both positive and negative parity are isolated via a parity projection method. The extent to which spin projection is needed is examined. The gross features of the splittings from the nucleon ground state show a trend consistent with experimental results at the quark masses explored.

Chemical potential response of pseudoscalar meson masses in the Nambu—Jona-Lasinio model

Responses to chemical potential of the pseudoscalar meson screening mass and the chiral condensate in lattice QCD are investigated. On a 16 × 82 × 4 lattice with two flavors of staggered quarks the first and second responses below and above Tc are evaluated. Different behavior in the low and the high temperature phases are observed, which may be explained as a consequence of the chiral symmetry breaking and restoration.

THE STRUCTURE IN MESONIC CHANNELS ABOVE TC

We study relativistic charmonium on very fine quenched lattices (β = 6.4 and 6.6). We concentrate on the calculation of the hyperfine splitting between ηc and J/ψ, aiming for a controlled continuum extrapolation of this quantity. Results for the ηc and J/ψ wave functions are also presented.

Spin-3/2 nucleon andΔbaryons in lattice QCD

Abstract We report a project to provide a set of free source codes for lattice QCD. The programs may be used as fundamental blocks when one wants to construct his/her own QCD codes. They are written in Fortran 90 with use of MODULE, so that algorithms can transparently be seen. MPI is used for parallelization. We are also constructing a proto-type of QCD-GRID where one can try to run the code.

有限温度でのハドロン質量に対する化学ポテンシャルの2次の応答(熱場の量子論とその応用,研究会報告)

We present first results for masses of spin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fat links. In the isospin-1/2 sector, we observe, after appropriate spin and parity projection, a strong signal for the J^P=3/2^- state, and find good agreement between the 1/2^+ mass and earlier nucleon mass simulations with a spin-1/2 interpolating field. For the isospin-3/2 Delta states, clear mass splittings are observed between the various 1/2^+/- and 3/2^+/- channels, with the calculated level orderings in good agreement with those observed empirically.Abstract We present first results for masses ofspin-3/2 baryons in lattice QCD, using a novel fat-link clover fermion action in which only the irrelevant operators are constructed using fat links. In theisospin-1/2 sector; we observe, after appropriate spin and parity projection, a strong signal for the J P =3/2 − state, and find good agreement between the½ + mass and earlier nucleon mass simulations with aspin-½ interpolating field. For theisospin-3/2 Δ states, clear mass splittings are observed between the various½ ± and3/2 ± channels, with the calculated level orderings in good agreement with those observed empirically.