B-physics from Nf=2 tmQCD: the Standard Model and beyond
| Autor: | V. Gimenez, Gregorio Herdoiza, Roberto Frezzotti, Silvano Simula, E. Picca, Marco Ciuchini, Vittorio Lubicz, Chris Michael, Andrea Shindler, Petros Dimopoulos, N. Carrasco, Cecilia Tarantino, Luca Silvestrini, Giancarlo Rossi, Francesco Sanfilippo |
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| Přispěvatelé: | SCOAP, Carrasco, N, Ciuchini, M, Dimopoulos, P, Frezzotti, R, Gimenez, V, Herdoiza, G, Lubicz, Vittorio, Michael, C, Picca, Eleonora, Rossi, Gc, Sanfilippo, F, Shindler, A, Silvestrini, L, Simula, S, Tarantino, Cecilia, Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Instituto de Física Teórica UAM/CSIC (IFT), Universidad Autonoma de Madrid (UAM)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Quark
Particle physics Nuclear and High Energy Physics High Energy Physics::Lattice Nuclear Theory FOS: Physical sciences bottom quark mass 01 natural sciences Bottom quark Standard Model Lattice constant Pion High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Lattice 0103 physical sciences Continuum (set theory) 010306 general physics Nuclear Experiment Physics Unitarity [PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat] 010308 nuclear & particles physics High Energy Physics - Lattice (hep-lat) High Energy Physics::Phenomenology Física Particle Physics - Lattice Lattice QCD B-physics SM and beyond Settore FIS/02 - Fisica Teorica Modelli e Metodi Matematici High Energy Physics - Phenomenology B-meson mixing [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] High Energy Physics::Experiment |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Journal of High Energy Physics Carrasco Vela, Nuria Ciuchini, M. Dimopoulos, P. Frezzotti, R. Giménez Gómez, Vicente Herdoiza, G. Lubicz, V. Michael, C. Picca, E. Rossi, G.C. Sanfilippo, F. Shindler, A. Silvestrini, L. Simula, S. Tarantino, C. 2014 B-physics from Nf=2 tmQCD: the Standard Model and beyond Journal of High Energy Physics 2014 3 016 RODERIC. Repositorio Institucional de la Universitat de Valéncia |
| Popis: | Carrasco, Nuria et al. We present a lattice QCD computation of the b-quark mass, the B and B s decay constants, the B-mixing bag prameters for the full four-fermion operator basis as well as determinations for ξ and f Bq B(q)i−−−√ extrapolated to the continuum limit and to the physical pion mass. We used N f = 2 twisted mass Wilson fermions at four values of the lattice spacing with pion masses ranging from 280 to 500 MeV. Extrapolation in the heavy quark mass from the charm to the bottom quark region has been carried out on ratios of physical quantities computed at nearby quark masses, exploiting the fact that they have an exactly known infinite mass limit. Our results are m b (m b , MS¯¯¯¯¯ ) = 4.29(12) GeV, f Bs = 228(8) MeV, f B = 189(8) MeV and f Bs /f B = 1.206(24). Moreover with our results for the bag-parameters we find ξ = 1.225(31), B(s)1/B(d)1 = 1.01(2), f Bd Bˆ(d)1−−−√ = 216(10) MeV and 1 f Bs Bˆ(s)1−−−√ = 262(10) MeV. We also computed the bag parameters for the complete basis of the four-fermion operators which are required in beyond the SM theories. By using these results for the bag parameters we are able to provide a refined Unitarity Triangle analysis in the presence of New Physics, improving the bounds coming from B (s) − B¯(s) mixing. G. H. acknowledges the support by DFG (SFB 1044). We acknowledge computer time made available to us on the Altix system at the HLRN supercomputing service in Berlin under the project “B-physics from lattice QCD simulations”. We acknowledge partial support from ERC Ideas Starting Grant n. 279972 “NPFlavour” and ERC Ideas Advanced Grant n. 267985 “DaMeSyFla”. |
| Databáze: | OpenAIRE |
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