K{yields}{pi}l{nu} semileptonic form factors from two-flavor lattice QCD
Journal Article
·
· Physical Review. D, Particles Fields
- Dipartimento di Fisica, Universita di Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy)
- Dep. ECM and ICC, Universitat de Barcelona, Diagonal 647, 08028 Barcelona (Spain)
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma (Italy)
We present new lattice results of the K{yields}{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{sub +}(0)=0.9560(84), which, combined with the latest experimental data for K{sub l3} decays, leads to |V{sub us}|=0.2267(5){sub exp}(20){sub f{sub +}}{sub (0)}. Using the PDG(2008) determinations of |V{sub ud}| and |V{sub ub}| our result implies for the unitarity relation |V{sub ud}|{sup 2}+|V{sub us}|{sup 2}+|V{sub ub}|{sup 2}=1.0004(15). For the O(p{sup 6}) term of the chiral expansion of f{sub +}(0) we get {delta}f{identical_to}f{sub +}(0)-1-f{sub 2}=-0.0214(84)
- OSTI ID:
- 21313436
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 80, Issue 11; Other Information: DOI: 10.1103/PhysRevD.80.111502; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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