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Kπlν semileptonic form factors from two-flavor lattice QCD

V. Lubicz, F. Mescia, S. Simula, and C. Tarantino (European Twisted Mass Collaboration)
Phys. Rev. D 80, 111502(R) – Published 30 December 2009

Abstract

We present new lattice results of the Kπν 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 K3 decays, leads to |Vus|=0.2267(5)exp(20)f+(0). Using the PDG(2008) determinations of |Vud| and |Vub| our result implies for the unitarity relation |Vud|2+|Vus|2+|Vub|2=1.0004(15). For the O(p6) term of the chiral expansion of f+(0) we get Δff+(0)1f2=0.0214(84).

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  • Received 6 July 2009

DOI:https://doi.org/10.1103/PhysRevD.80.111502

©2009 American Physical Society

Authors & Affiliations

V. Lubicz1,2, F. Mescia3, S. Simula2, and C. Tarantino1,2 (European Twisted Mass Collaboration)

  • 1Dipartimento di Fisica, Università di Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy
  • 2Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy
  • 3Dep. ECM and ICC, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain

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Issue

Vol. 80, Iss. 11 — 1 December 2009

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