Wed·Oct 31, 2007Wednesday·October 31, 2007

1. 01*

   Strange quark contribution to nucleon form factors

   Ronald Babich🇺🇸 · Richard Brower🇺🇸 · Michael Clark🇺🇸 · George Fleming🇺🇸 · James Osborn🇺🇸 · Claudio Rebbi🇺🇸

   We discuss methods for the calculation of disconnected diagrams and their application to various form factors of the nucleon. In particular, we present preliminary results for the strange contribution to the scalar and axial form factors, calculated with N_f=2 dynamical flavors of Wilson fermions on an anisotropic lattice.

   hep-latPoS(2007)·10 citations
2. 02*

   Weak low-energy couplings from topological zero-mode wavefunctions

   P. Hernandez🇪🇸 · M. Laine🇩🇪 · C. Pena🇪🇸 · E. Torro🇪🇸 · J. Wennekers🇬🇧 · H. Wittig🇩🇪

   We discuss a new method to determine the low-energy couplings of the $\Delta S=1$ weak Hamiltonian in the $ϵ$-regime. It relies on a matching of the topological poles in $1/m^2$ of three-point functions of two pseudoscalar densities and a four-fermion operator computed in lattice QCD, to the same observables in the Chiral Effective Theory. We present the results of a NLO computation in chiral perturbation theory of these correlation functions together with some preliminary numerical results.

   hep-latPoS(2007)·0 citations
3. 03*

   On the Continuum and Lattice Formulations of N=4 D=3 Twisted Super Yang-Mills

   Kazuhiro Nagata🇺🇸

   Employing a twisted superspace with eight supercharges, we describe an off-shell formulation of N=4 D=3 twisted super Yang-Mills in the continuum spacetime which underlies the recent proposal of N=4 D=3 twisted super Yang-Mills on a lattice (arXiv:0707.3533[hep-lat]). By a dimensional reduction from the N=2 D=4, we explore the two possible topological twists of N=4 D=3 and then show that the lattice formulation given in arXiv:0707.3533[hep-lat] is essentially categorized as the B-type. We also show that, amongst the two inequivalent twists of N=4 D=3, only the B-type SYM can be realized on the lattice consistently with the Leibniz rule and the gauge covariance on the lattice.

   ↳ hep-thhep-latJHEP(2008)·14 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.