K→πlν semileptonic form factors from two-flavor lattice QCD

被引：36
|
作者：
Lubicz, V. [1 ,2 ]
Mescia, F. [3 ,4 ]
Simula, S. [2 ]
Tarantino, C. [1 ,2 ]
机构：
[1] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy
[2] Ist Nazl Fis Nucl, Sez Roma Tre, I-00146 Rome, Italy
[3] Univ Barcelona, Dep ECM, E-08028 Barcelona, Spain
[4] Univ Barcelona, ICC, E-08028 Barcelona, Spain
来源：
PHYSICAL REVIEW D | 2009年 / 80卷 / 11期
关键词：
TWISTED MASS FERMIONS; THEOREM;
D O I：
10.1103/PhysRevD.80.111502
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present new lattice results of the K ->pi l nu semileptonic form factors obtained from simulations with two flavors of dynamical twisted-mass fermions, using pion masses as light as 260 MeV. Our main result is f(+)(0)=0.9560(84), which, combined with the latest experimental data for K-l3 decays, leads to |V-us|=0.2267(5)(exp)(20)(f+)(0). Using the PDG(2008) determinations of |V-ud| and |V-ub| our result implies for the unitarity relation |V-ud|(2)+|V-us|(2)+|V-ub|(2)=1.0004(15). For the O(p(6)) term of the chiral expansion of f(+)(0) we get Delta f equivalent to f(+)(0)-1-f(2)=-0.0214(84).
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页数：5
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