2026-04-17T07:42:00Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1317112025-12-05T16:44:37Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917
RECERCAT
author
Lubicz, V.
author
Mescia, Federico
author
Simula, S.
author
Tarantino, Carolina
author
ETM Collaboration
2019-04-08T08:35:41Z2019-04-08T08:35:41Z2009-12-302019-04-08T08:35:41Z
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 ) .
(c) American Physical Society, 2009 info:eu-repo/semantics/openAccess
Física de partícules
Experiments
Particle physics
Experiments
K→πlν semileptonic form factors from two-flavor lattice QCD
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion