2014/10/27 by N. Carrasco, Nuria Carrasco, Carrasco, Nuria +15
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-lat
paper · pdf · doi:10.48550/arxiv.1410.7159
arxiv created 2014/10/27 · openalex publication_date 2014/10/27 · arxiv updated 2014/10/28 · openalex created_date 2022/10/06 · openalex updated_date 2026/07/28
We investigate the vector form factor relevant for the Kℓ 3 semileptonic decay using maximally twisted-mass fermions with 4 dynamical flavours (Nf=2+1+1). Our simulations feature pion masses ranging from 210 MeV to approximately 450 MeV and lattice spacing values as small as 0.06fm. Our main result for the vector form factor at zero 4-momentum transfer is f+(0)=0.9683(65) where the uncertainty is both statistical and systematic. By combining our result with the experimental value of f+(0)|Vus| we obtain |Vus|=0.2234(16), which satisfies the unitarity constraint of the Standard Model at the permille level.