HEP Lattice·hep-lat
3 papers—3 primary·0 cross-listed·reconstructed*
F.Farchioni🇩🇪 · C.Urbach🇩🇪 · R.Frezzotti🇮🇹 · K.Jansen🇩🇪 · I.Montvay🇩🇪 · G.C.Rossi🇮🇹 · E.E.Scholz🇩🇪 · A.Shindler🇩🇪 · N.Ukita🇩🇪 · I.Wetzorke🇩🇪
The phase structure of zero temperature twisted mass lattice QCD is investigated. We find strong metastabilities in the plaquette observable when the untwisted quark mass sweeps across zero.
An exploratory study of two-particle wave function is carried out with a four dimensional simple model. The wave functions not only for two-particle ground and first excited states but also for an unstable state are calculated from three- and four-point functions using the diagonalization method suggested by Lüscher and Wolff. The scattering phase shift is evaluated from these wave functions.
Luigi Del Debbio🇨🇭 · Leonardo Giusti🇫🇷 · Claudio Pica🇮🇹
We present the results of a computation of the topological susceptibility in the SU(3) Yang--Mills theory performed by employing the expression of the topological charge density operator suggested by Neuberger's fermions. In the continuum limit we find r_0^4 chi = 0.059(3), which corresponds to chi=(191 \pm 5 MeV)^4 if F_K is used to set the scale. Our result supports the Witten--Veneziano explanation for the large mass of the eta'.
* 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.