Mon·Sep 6, 2004Monday·September 6, 2004

1. 01*

   Excited hadrons from improved interpolating fields

   Tommy Burch🇩🇪 · Christof Gattringer🇩🇪 · Leonid Ya. Glozman🇦🇹 · Reinhard Kleindl🇦🇹 · C. B. Lang🇦🇹 · Andreas Schäfer🇩🇪

   The calculation of quark propagators for Ginsparg-Wilson-type Dirac operators is costly and thus limited to a few different sources. We present a new approach for determining spatially optimized operators for lattice spectroscopy of excited hadrons. Jacobi smeared quark sources with different widths are combined to construct hadron operators with different spatial wave functions. We study the Roper state and excited rho and pion mesons.

   hep-latNucl.Phys.B Proc.Suppl.(2005)·15 citations
2. 02*

   Lattice Supersymmetry via Twisting

   Simon Catterall🇺🇸

   We describe how the usual supercharges of extended supersymmetry may be {\it twisted} to produce a BRST-like supercharge $Q$. The usual supersymmetry algebra is then replaced by a twisted algebra and the action of the twisted theory is shown to be generically $Q$-exact. In flat space the twisting procedure can be regarded as a change of variables carrying no physical significance. However, the twisted theories can often be transferred to the lattice while preserving the twisted supersymmetry. As an example we construct a lattice version of the two-dimensional supersymmetric sigma model.

   hep-latNucl.Phys.B Proc.Suppl.(2005)·11 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.