The kaon semileptonic form factor with near physical domain wall quarks

被引：22

作者：

Boyle, P. A. ^{[1
]}

Flynn, J. M. ^{[2
]}

Garron, N. ^{[3
]}

Juettner, A. ^{[2
]}

Sachrajda, C. T. ^{[2
]}

Sivalingam, K. ^{[1
]}

Zanotti, J. M. ^{[4
]}

机构：

[1] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[3] Trinity Coll Dublin, Sch Math, Dublin 2, Ireland

[4] Univ Adelaide, Sch Chem & Phys, CSSM, Adelaide, SA 5005, Australia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 08期

基金：

澳大利亚研究理事会; 英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

Lattice QCD; Quark Masses and SM Parameters; Kaon Physics; Standard Model; CHIRAL FERMIONS; LATTICE; MESON; DECAY; MODEL;

D O I：

10.1007/JHEP08(2013)132

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present a new calculation of the K -> pi semileptonic form factor at zero momentum transfer in domain wall lattice QCD with N-f = 2+1 dynamical quark flavours. By using partially twisted boundary conditions we simulate directly at the phenomenologically relevant point of zero momentum transfer. We perform a joint analysis for all available ensembles which include three different lattice spacings (a = 0.09 - 0.14 fm), large physical volumes (m(pi)L > 3.9) and pion masses as low as 171 MeV. The comprehensive set of simulation points allows for a detailed study of systematic effects leading to the prediction f(+)(K pi)(0) = 0.9670(20)((+18)(-46)), where the first error is statistical and the second error systematic. The result allows us to extract the CKM-matrix element vertical bar V-us vertical bar = 0.2237((+13)(-8)) and confirm first-row CKM-unitarity in the Standard Model at the sub per mille level.

引用

页数：16

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