Título:
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K→πlν semileptonic form factors from two-flavor lattice QCD
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Autor/a:
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Lubicz, V.; Mescia, Federico; Simula, S.; Tarantino, C.; ETM Collaboration
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Otros autores:
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Universitat de Barcelona |
Abstract:
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We present new lattice results of the K → π ℓ ν 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 ℓ 3 decays, leads to | V u s | = 0.2267 ( 5 ) exp ( 20 ) f + ( 0 ) . Using the PDG(2008) determinations of | V u d | and | V u b | our result implies for the unitarity relation | V u d | 2 + | V u s | 2 + | V u b | 2 = 1.0004 ( 15 ) . For the O ( p 6 ) term of the chiral expansion of f + ( 0 ) we get Δ f ≡ f + ( 0 ) − 1 − f 2 = − 0.0214 ( 84 ) . |
Materia(s):
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-Física de partícules -Experiments -Particle physics -Experiments |
Derechos:
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(c) American Physical Society, 2009
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Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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American Physical Society
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