Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/315
Title: K ->pi l nu semileptonic form factors from two-flavor lattice QCD
Authors: Lubicz, Vittorio
Mescia, Federico
Simula, Silvano
Tarantino, Cecilia
Keywords: Twisted mass fermiIons
light quarks
theorem
decays
Issue Date: Dec-2009
Publisher: APS
Abstract: We present new lattice results of the K ->pi l nu semileptonic formfactors obtained from simulations with two flavors of dynamicaltwisted-mass fermions, using pion masses as light as 260 MeV. Our mainresult is f(+)(0)=0.9560(84), which, combined with the latestexperimental 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 thechiral expansion of f(+)(0) we get Delta f equivalent tof(+)(0)-1-f(2)=-0.0214(84).
URI: http://hdl.handle.net/2307/315
ISSN: 1550-7998
DOI: 10.1103/PhysRevD.80.111502
metadata.dc.identifier.url: http://link.aps.org/doi/10.1103/PhysRevD.80.111502
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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