The global topological meaning of cocycles in a Gauge group

CPviolation inBd,s→l+l−Dai1, Huang2, Li3 et al. 2003Phys. Rev. D627821View full textAdd to dashboardCite

“…Recently, it has been shown that CP violation in B d,s → l + l − (l=µ, τ ) is also an interesting observable for searching for new physics [11,12]. In the present paper we study it in the model III 2HDM [13,14]. It is well-known that in the model III 2HDM the couplings involving Higgs bosons and fermions can have complex phases, which can induce CP violation effects, even in the simplest case in which all tree-level FCNC couplings are negligible.…”

“…In general, the Higgs potential in 2HDM which has no discrete symmetry may be CP conserved or CP violated [14,20]. In order to concentrate on the effects of FC Yukawa couplings we assume the potential is CP conserved.…”

Erratum: Basis-independent methods for the two-Higgs-doublet model [Phys. Rev. D72, 035004 (2005)]

“…The most general structure for the Higgs-fermion Yukawa couplings, often referred to as the type-III model [13], is given in the generic basis by:…”

“…In type-II models [11,12], there exists a basis choice in which one Higgs field couples to up-type quarks, and the other Higgs field couples to down-type quarks. Type-III models [13] allow both Higgs fields to couple to all the Standard Model fermions; such a model is phenomenologically viable only if the resulting FCNC-couplings are sufficiently small.…”

Constraining the Couplings of a Charged Higgs to Heavy Quarks

“…In type-II [5,6], there exists a basis choice in which one Higgs field couples to the up-type quarks, and the other Higgs field couples to the down-type quarks and charged leptons. Type-III models [7] allow both Higgs fields to couple to all SM fermions, where such models are viable only if the resulting FCNC couplings are small.…”