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标题：K -> pi semileptonic form factor and the pion electromagnetic form factor using domain wall fermions and partially twisted boundary conditions
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作者：J. ZANOTTI ; P.A. Boyle ; C. Kelly 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2008
卷号：2008
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We compute the Kℓ3 and pion form factors using partially twisted boundary conditions. The twists are chosen so that the Kℓ3 form factors are calculated directly at zero momentum transfer (q2 = 0), removing the need for a q2 interpolation, while the pion form factor is determined at values of q2 close to q2 = 0. The simulations are performed on an ensemble of the RBC/UKQCD collaboration’s gauge configurations with Domain Wall Fermions and the Iwaski gauge action with an inverse lattice spacing of 1.73(3)GeV. Simulating at a single pion mass of 330MeV, we find the pion charge radius to be hr2i330MeV = 0.354(31) fm2 which, using NLO SU(2) chiral perturbation theory, translates to a value of hr2pi = 0.418(31) fm2 for a physical pion. For the value of the Kℓ3 form factor, f + Kp (q2), determined directly at q2 = 0, we find a value of f + Kp (0) = 0.9742(41) at this particular quark mass, which agrees well with our earlier result (0.9774(35)) obtained using the standard, indirect method.