Flavor signatures of isosinglet vector-like down quark model
نویسندگان
چکیده
منابع مشابه
B Factory Constraints on Isosinglet Down Quark Mixing , and Predictions For Other CP Violating Experiments
In the main part of the paper we project forward to having B factory determinations of sin(2β) and sin(2α), for which we take several values. First, we use a joint χ analysis of CKM experiments to constrain CKM matrix elements in the standard model, and experiments on the angles α, β, and γ, and on xs and null CP asymmetries. Then we invoke mixing to a new isosinglet down quark (as in E6) which...
متن کاملFlavor Symmetry and Quark Model of Hadrons
As discussed in the previous Chapter, when the universe cools below TC , quarks and gluons are clustered to form color-singlet hadrons. When the temperature gets sufficiently low, the anti-baryon density becomes negligible, and the excess baryon number (or baryon chemical potential) decides the density of residual baryons. Because the proton and neutrons (together called nucleons) are the lowes...
متن کاملA vector-like heavy quark in the Littlest Higgs model
The Littlest Higgs model contains a new vector-like heavy quark in the up sector. There are two interesting features of its existence. One is that it extends the 3 × 3 CKM matrix in the Standard Model to a 4 × 3 matrix and the other is that it allows Z-mediated flavor changing neutral currents at tree level in the up sector but not in the down sector. We examine a few of possible windows in whi...
متن کاملNew Vector-Like Fermions and Flavor Physics
We study renormalizable extensions of the standard model that contain vector-like fermions in a (single) complex representation of the standard model gauge group. There are 11 models where the vector-like fermions Yukawa couple to the standard model fermions via the Higgs field. These models do not introduce additional finetunings. They can lead to, and are constrained by, a number of different...
متن کاملElectroweak Baryogenesis in the Presence of an Isosinglet Quark
We consider the possibility of electroweak baryogenesis in a simple extension of the standard model with an extra singlet complex scalar and a vector-like down quark. We show that in the present model the first-order electroweak phase transition can be strong enough to avoid the baryon asymmetry washout by sphalerons and that the CP-violating effects can be sufficient to explain the observed ba...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2016
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2016.03.012