QCD spectroscopy with three light quarks

Abstract

We report about a simulation using three dynamical Wilson quarks and on the progress in going to small quark masses.

Partially quenched chiral perturbation theory and numerical simulations

“…A perfect fit is obtained with the parameters in (23). The value of L S5 can be determined from Rf V V .…”

“…In these simulations we use the two-step multiboson (TSMB) algorithm for dynamical fermions [22] and consider for the moment N s = 2 dynamical "sea" quarks. The case of N s = 3 is also under study [23]. Our first simulations were oriented towards the investigation of simulation costs as a function of the quark mass and were performed on modest size lattices (typically 8 3 • 16) with lattice spacings of the order a ≃ 0.27 fm -a value where continuum behaviour is not necessarily expected.…”

Progress in lattice algorithms

“…Empirical studies of this problem for new simulations of QCD with three quarks (with a target of m q ≈ m s /4) were presented to the conference by Gebert [16]. They expect the sign problem to be very mild in this region.…”

Lattice supersymmetric ward identities

“…See [2] and references therein for more details on the algorithm. See also [6] for an application to QCD with three dynamical quark flavors. The configurations at κ = 0.1925 were produced in [2].…”