English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/96539
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

B-physics from Nf = 2 tmQCD: the Standard Model and beyond

AutorCarrasco, Nuria ; Giménez Álvarez, Marcos; Tarantino, C.; Giménez Gómez, Vicente
Fecha de publicación4-mar-2014
EditorSpringer
CitaciónJournal of High Energy Physics 2014: 16 (2014)
ResumenWe 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.
DescripciónCarrasco, Nuria et al.
Versión del editorhttp://dx.doi.org/10.1007/JHEP03(2014)016
URIhttp://hdl.handle.net/10261/96539
DOI10.1007/JHEP03(2014)016
E-ISSN1029-8479
Aparece en las colecciones: (IFIC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
standard _model_Carrasco.pdf1,25 MBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.