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

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

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dc.contributor.author Botella Olcina, Francisco J.
dc.contributor.author Branco, Gustavo Castelo
dc.contributor.author Nebot Gómez, Miguel
dc.date.accessioned 2014-11-06T09:37:38Z
dc.date.available 2014-11-06T09:37:38Z
dc.date.issued 2009
dc.identifier.uri http://hdl.handle.net/10550/39625
dc.description.abstract We show that it is possible to accommodate the observed size of the phase in B-s(0) - (B) over bar (0)(s) mixing in the framework of a model with violation of 3 x 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 to arg(-VtsVcbVtb*V-cs*) of order lambda, to be contrasted with the situation in the standard model, where chi is constrained to be of order lambda(2). We point out that this scenario implies rare top decays t -> cZ at a rate observable at the LHC and vertical bar V-tb vertical bar significantly different from unity. In this framework, one may also account for the observed size of D-0 - (D) over bar (0) mixing without having to invoke long-distance contributions. It is also shown that in the present scenario, the observed size of D-0 - (D) over bar (0) mixing constrains chi' equivalent to arg(-VcdVusVcs*V-ud*) to be of order lambda(4), which is significantly smaller than what is allowed in generic models with violations of 3 x 3 unitarity.
dc.language.iso eng
dc.relation.ispartof Physical Review D, 2009, vol. 79, num. 9, p. 096009
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Botella Olcina, Francisco J. Branco, Gustavo Castelo Nebot Gómez, Miguel 2009 Small violations of unitarity, the phase in B-s(0) and visible t-> cZ decays at the LHC Physical Review D 79 9 096009
dc.subject Física
dc.title Small violations of unitarity, the phase in B-s(0) and visible t-> cZ decays at the LHC
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-11-06T09:37:38Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.79.096009
dc.identifier.idgrec 056537

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