Mon·Oct 1, 2001Monday·October 1, 2001

1. 01*

   Lattice Matter

   Simon Hands (U.W. Swansea)🇬🇧

   I review recent developments in the study of strongly interacting field theories with non-zero chemical potential mu. In particular I focus on (a) the determination of the QCD critical endpoint in the (mu,T) plane; (b) superfluid condensates in Two Color QCD; and (c) Fermi surface effects in the NJL model. Some remarks are made concerning the relation of superconductivity with the sign problem.

   hep-lathep-phNucl.Phys.B Proc.Suppl.(2002)·55 citations
2. 02*

   Semileptonic decay of a heavy-light pseudoscalar to a light vector meson

   UKQCD Collaboration · J. Gill

   We present the results of a calculation of semileptonic form factors of D and B mesons. The calculation uses nonperturbatively order a improved quenched lattice QCD and two values of the coupling. Results for charm mesons show reasonable agreement with experiment. The lattice results for B -> rho l nu are compared with high q^2 experimental results.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·22 citations
3. 03*

   A nonperturbative determination of c_A and the scaling of f_pi and m^{MSbar}

   S.Collins · C.T.H.Davies · G.P.Lepage · J.Shigemitsu

   We calculate the $O(a)$ improvement coefficient for the axial-vector current using the nonperturbative method proposed by the LANL group. Results for the coefficient in the range $\beta =5.93$ to 6.2 are presented. We find $c_A$ is close to the 1-loop tadpole-improved perturbative value. In addition, scaling of the pseudoscalar decay constant and renormalised quark mass is improved compared to that obtained using the (larger) $c_A$ values obtained by the ALPHA collaboration.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·2 citations
4. 04*

   Unquenching the topological susceptibility with an overlap action

   Tamas G. Kovacs (NIC/DESY Zeuthen, & Pecs U.)🇩🇪

   We estimate the quark-mass dependence of the topological susceptibility with dynamical overlap and clover fermions. Unquenching effects on the susceptibility turn out to be well approximated by a reweighting of a quenched ensemble with a low-eigenmode truncation of the fermionic determinant. We find that it is most likely due to the explicit chiral symmetry breaking of the fermion action that present day dynamical simulations do not show the expected suppression of the topological susceptibility.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·3 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.