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K∗ vector and tensor couplings from Nf=2 twisted mass QCD Dimopoulos, P. Mescia, Federico Vladikas, A. Física de partícules Experiments Particle physics Experiments The mass m K ∗ and vector coupling f K ∗ of the K ∗ meson, as well as the ratio of the tensor to vector couplings f T f V | K ∗ , are computed in lattice QCD. Our simulations are performed in a partially quenched setup, with two dynamical (sea) Wilson quark flavors, having a maximally twisted mass term. Valence quarks are either of the standard or the Osterwalder-Seiler maximally twisted variety. Results obtained at three values of the lattice spacing are extrapolated to the continuum, giving m K ∗ = 981 ( 33 )     MeV , f K ∗ = 240 ( 18 )     MeV , and f T ( 2     GeV ) f V | K ∗ = 0.704 ( 41 ) . 2019-04-08T12:12:21Z 2019-04-08T12:12:21Z 2011-07-19 2019-04-08T12:12:21Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/131796 623814 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.84.014505 Physical Review D, 2011, vol. 84, num. 1, p. 014505 https://doi.org/10.1103/PhysRevD.84.014505 (c) American Physical Society, 2011 info:eu-repo/semantics/openAccess 7 p. application/pdf application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)