Document type
ArticleVersion
Published versionPublication date
All rights reserved
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/131711
K→πlν semileptonic form factors from two-flavor lattice QCD
Journal Title
Director/Tutor
Additional contribution
Journal ISSN
Volume Title
Abstract
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 ) .
Related resource
Subject
Subject (English)
Citation
Citation
LUBICZ, V., et al. K→πlν semileptonic form factors from two-flavor lattice QCD. Physical Review D. 2009. Vol. 80, num. 11, pags. 111502(R). ISSN 1550-7998. [consulted: 6 of October of 2026]. Available at: https://hdl.handle.net/2445/131711