6533b856fe1ef96bd12b244f
RESEARCH PRODUCT
The size of and physics beyond the Standard Model
M. NebotGustavo C. BrancoJuan Antonio Aguilar SaavedraFrancisco J. Botellasubject
PhysicsQuarkNuclear and High Energy PhysicsParticle physicsUnitarityElectron–positron annihilationPhysics beyond the Standard ModelHigh Energy Physics::PhenomenologyElectroweak interactionStandard ModelNuclear physicsCP violationHigh Energy Physics::ExperimentB mesondescription
Abstract We analyse the allowed range of values of χ , both in the Standard Model and in models with new physics, pointing out that a relatively large value of χ , e.g., of order λ , is only possible in models where the unitarity of the 3 × 3 Cabibbo–Kobayashi–Maskawa matrix is violated through the introduction of extra Q = 2 / 3 quarks. We study the interesting case where the extra quark is an isosinglet, determining the allowed range for χ and the effect of a large χ on various low-energy observables, such as CP asymmetries in B meson decays. We also discuss the correlated effects which would be observable at high energy colliders, like decays t → c Z , modifications of the cross section and forward–backward asymmetry in e + e − → t t ¯ and the direct production of a new quark.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-01-01 | Nuclear Physics B |