K -> pion Semileptonic Form Factors from Two-Flavor Lattice QCD

V. Lubicz; F. Mescia; S. Simula; C. Tarantino

doi:10.1103/PhysRevD.80.111502

K -> pion Semileptonic Form Factors from Two-Flavor Lattice QCD

High Energy Physics - Lattice 2019-08-13 v1 High Energy Physics - Phenomenology

Authors: V. Lubicz , F. Mescia , S. Simula , C. Tarantino

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Abstract

We present new lattice results of the K -> pion 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 Kl3 decays, leads to |V_{us}| = 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(p**6) term of the chiral expansion of f+(0) we get Df = f+(0) - 1 - f2 = -0.0214 (84).

Keywords

K -> pion semileptonic form factors lattice QCD twisted-mass fermions CKM matrix |Vus| chiral perturbation theory unitarity Kl3 decays

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@article{arxiv.0906.4728,
  title  = {K -> pion Semileptonic Form Factors from Two-Flavor Lattice QCD},
  author = {V. Lubicz and F. Mescia and S. Simula and C. Tarantino},
  journal= {arXiv preprint arXiv:0906.4728},
  year   = {2019}
}

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4 pages, 4 figures, 1 table, revtex

K -> pion Semileptonic Form Factors from Two-Flavor Lattice QCD

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