English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/15808
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL

Small violations of unitarity, the phase in B-s(0) - (B)over-bar(s)(0) and visible t -> cZ decays at the LHC

AutorBotella, Francisco J. ; Branco, Gustavo C. ; Nebot Gómez, Miguel
Fecha de publicación15-may-2009
EditorAmerican Physical Society
CitaciónPhys. Rev. D 79, 096009 (2009)
ResumenWe show that it is possible to accommodate the observed size of the phase in Bs0-[overline B]s0 mixing in the framework of a model with violation of 3×3 unitarity. This violation is associated to the presence of a new Q=2/3 isosinglet quark T, which mixes both with t and c and has a mass not exceeding 500 GeV. The crucial point is the fact that this framework allows for chi[equivalent]arg(-VtsVcbVtb*Vcs*) of order lambda, to be contrasted with the situation in the standard model, where chi is constrained to be of order lambda2. We point out that this scenario implies rare top decays t-->cZ at a rate observable at the LHC and |Vtb| significantly different from unity. In this framework, one may also account for the observed size of D0-[overline D]0 mixing without having to invoke long-distance contributions. It is also shown that in the present scenario, the observed size of D0-[overline D]0 mixing constrains chi[prime][equivalent]arg(-VcdVusVcs*Vud*) to be of order lambda4, which is significantly smaller than what is allowed in generic models with violations of 3×3 unitarity.
Versión del editorhhtp://dx.doi.org/10.1103/PhysRevD.79.096009
Aparece en las colecciones: (IFIC) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Botella.pdf222,12 kBAdobe PDFVista previa
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.