Fri·Aug 17, 2007Friday·August 17, 2007

1. 01*

   Results and Frontiers in Lattice Baryon Spectroscopy

   John Bulava🇺🇸 · Robert Edwards🇺🇸 · George Fleming🇺🇸 · K. Jimmy Juge🇺🇸 · Adam C. Lichtl🇺🇸 · Nilmani Mathur🇮🇳 · Colin Morningstar🇺🇸 · David Richards🇺🇸 · Stephen J. Wallace🇺🇸

   The Lattice Hadron Physics Collaboration (LHPC) baryon spectroscopy effort is reviewed. To date the LHPC has performed exploratory Lattice QCD calculations of the low-lying spectrum of Nucleon and Delta baryons. These calculations demonstrate the effectiveness of our method by obtaining the masses of an unprecedented number of excited states with definite quantum numbers. Future work of the project is outlined.

   hep-latAIP Conf.Proc.(2007)·3 citations
2. 02*

   Monopoles, topology of the Standard Model, and unification of interactions at Tev scale

   M. A. Zubkov🇷🇺

   It is shown that unification of strong and Electroweak interactions at Tev scale may lead to appearance of topologically stable monopoles with masses of the order of 40 Tev. Those monopoles may play an important role in the early Universe, at finite temperature. They may even be condensed at high enough temperature. The lattice model for investigation of this phenomenon is presented.

   hep-lathep-phPoS(2007)·1 citation
3. 03*

   The spin structure of the pion

   D. Brömmel🇩🇪 · M. Diehl🇩🇪 · M. Göckeler🇩🇪 · Ph. Hägler🇩🇪 · R. Horsley🇬🇧 · Y. Nakamura🇩🇪 · D. Pleiter🇩🇪 · P.E.L. Rakow🇬🇧 · A. Schäfer🇩🇪 · G. Schierholz🇩🇪 · H. Stüben🇩🇪 · J. M. Zanotti (for the QCDSF collaboration and UKQCD collaboration)🇬🇧

   We present the first calculation of the transverse spin structure of the pion in lattice QCD. Our simulations are based on two flavors of non-perturbatively improved Wilson fermions, with pion masses as low as 400 MeV in volumes up to (2.1 fm)^3 and lattice spacings below 0.1 fm. We find a characteristic asymmetry in the spatial distribution of transversely polarized quarks. This asymmetry is very similar in magnitude to the analogous asymmetry we previously obtained for quarks in the nucleon. Our results support the hypothesis that all Boer-Mulders functions are alike.

   hep-lathep-phPRL(2008)·102 citations
4. 04*

   Effective Field Theory for the Anisotropic Wilson Lattice Action

   Paulo F. Bedaque🇺🇸 · Michael I. Buchoff🇺🇸 · Andre Walker-Loud🇺🇸

   We construct the effective field theory appropriate for describing the low energy behavior of anisotropic Wilson lattice actions and the O(a) improved variant thereof. We then apply this effective field theory to the hadron spectrum and dispersion relations, focussing on the corrections due to the anisotropy. We point out an important feature of anisotropic lattices regarding the Aoki-regime; for a given set of fermion masses and spatial lattice spacing, if an isotropic action is in the QCD-phase, this does not guarantee that the anisotropic action is outside the Aoki-regime. This may be important in the tuning of bare parameters for anisotropic lattices using domain-wall and overlap fermions as well as Wilson and O(a)-improved Wilson fermions.

   hep-latPRD(2008)·6 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.