Wed·Sep 18, 2002Wednesday·September 18, 2002

1. 01*

   Magnetic polarizability of hadrons from lattice QCD

   L. Zhou🇺🇸 · F.X. Lee🇺🇸 · W. Wilcox🇺🇸 · J. Christensen🇺🇸

   We extract the magnetic polarizability from the quadratic response of a hadron's mass shift in progressively small static magnetic fields. The calculation is done on a 24x12x12x24 lattice at a = 0.17 fm with an improved gauge action and the clover quark action. The results are compared to those from experiments and models where available.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·17 citations
2. 02*

   Modelling the quark propagator

   P.O. Bowman🇺🇸 · U.M. Heller🇺🇸 · D.B. Leinweber🇦🇺 · A.G. Williams🇦🇺

   The quark propagator is at the core of lattice hadron spectrum calculations as well as studies in other nonperturbative schemes. We investigate the quark propagator with an improved staggered action (Asqtad) and an improved gluon action, which provides good quality data down to small quark masses. This is used to construct ansätze suitable for model hadron calculations as well as adding to our intuitive understanding of QCD.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·91 citations
3. 03*

   Lattice perturbation theory for gluonic and fermionic actions

   I.T. Drummond🇬🇧 · A. Hart🇬🇧 · R.R. Horgan🇬🇧 · L.C. Storoni (Cambridge)🇬🇧

   We calculate the two loop Landau mean links and the one loop renormalisation of the anisotropy for Wilson and improved SU(3) gauge actions, using twisted boundary conditions as a gauge invariant infrared regulator. We show these accurately describe simulated results, and outline a method for generating Feynman rules for general lattice field theories, in a form suitable for efficient numerical calculation of perturbative loop diagrams.

   hep-latNucl.Phys.B Proc.Suppl.(2003)·11 citations
4. 04*

   Chiral Anomaly on Fuzzy 2-Sphere

   Hajime Aoki🇯🇵 · Satoshi Iso🇯🇵 · Keiichi Nagao🇯🇵

   We investigate chiral anomaly for fermions in fundamental representation on noncommutative (fuzzy) 2-sphere. In spite that this system is realized by finite dimensional matrices and no regularization is necessary for either UV or IR, we can reproduce the correct chiral anomaly which is consistent with the calculations done in flat noncommutative space. Like the flat case, there are ambiguities to define chiral currents. We define chiral currents in a gauge-invariant way and a gauge-covariant way, and show that the corresponding anomalous chiral Ward-Takahashi identities take different forms. The Ward-Takahashi identity for the gauge-invariant current contains explicit nonlocality while that for the covariant one is given by a local expression.

   ↳ hep-thhep-latPRD(2003)·35 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.