LHCb has reported deviations from the Standard Model in $b\ensuremath{\rightarrow}s{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ transitions for which a new neutral gauge boson is prime candidate an explanation. As this to couple flavor nonuniversal way muons and electrons order explain ${R}_{K}$, it interesting examine possibility that also lepton violated, especially light of CMS excess...

We construct a manifestly gauge invariant Lagrangian in $3+1$ dimensions for N Kaluza-Klein modes of an $\mathrm{SU}(m)$ theory the bulk. For example, if bulk is $4+1,$ effective ${\ensuremath{\Pi}}_{i=1}^{N+1}{\mathrm{SU}(m)}_{i}$ with chiral $(\overline{m},m)$ fields connecting groups sequentially. This can be viewed as Wilson action transverse lattice ${x}^{5},$ and shown explicitly to match continuum $4+1$ compactified truncated momentum space. Scale dependence couplings described by...

The precise determination of the Cabibbo-Kobayashi-Maskawa elements V(ub) and is crucial for any new physics analysis in flavor sector. Their values can be determined from several tree-level decays: extracted B→Dℓν B→D(*)ℓν while obtained B→πℓν, B→ρℓν, B→τν. In addition, both an inclusive available. There a long lasting discrepancy between exclusive determinations which recently even increased above 3σ level. this Letter we study possible effect on model independent way. We find that there...

We evaluate the finite one-loop threshold corrections, proportional to tan\ensuremath{\beta}, down quark mass matrix. These results in corrections masses and Cabibbo-Kobayashi-Maskawa (CKM) matrix elements. The CKM elements are novel feature of this paper. For grand unified theories with large tan\ensuremath{\beta} these may significantly alter low energy predictions four Jarlskog parameter J, a measure CP violation. angles \ensuremath{\alpha}, \ensuremath{\beta}, \ensuremath{\gamma}...

Neutrino masses originate most likely at some high energy scale M≫M Z . To obtain reliable predictions for neutrino and mixing angles one has to take into account quantum corrections which, in cases of degenerate or partly spectra, can significantly change the pattern angles. We review calculation these case which are effectively described by single dimension 5 operator. In framework Standard Model its minimal supersymmetric extension we discuss both renormalization group equations (RGE) low...

We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order slow-roll parameters. also compute numerically evolution from well within radius until end inflation. show explicitly a few examples, including recently proposed model 'roulette' how affect significantly perturbation between crossing

We construct an extension of the minimal supersymmetric standard model in which superpartners can naturally be heavier than electroweak scale. This ``little hierarchy'' scales is stable because Higgs arises as a pseudo-Nambu-Goldstone boson breaking accidental $SU(4)$ symmetry sector. Supersymmetry and global combine to forbid logarithmically divergent one-loop contributions mass. The follows from simple twin parity exchanges $SU(2)$ sectors...

A bstract It is pointed out that mixing effects in the CP-even scalar sector of NMSSM can give 6-8 GeV correction to SM-like Higgs mass moderate or large tan β regions with a small value singlet-higgs-higgs superfields coupling λ ~ $ \mathcal{O} (0.1). This effect comes mainly from lighter singlet. In same parameter range, heavy doublet singlet may strongly modify couplings singlet-like and 125 scalars. Firstly, LEP bounds on light be evaded for range its masses. Secondly, decay rates both...

A bstract We consider gravitational production of singlet fermions such as sterile neutrinos during and after inflation. The efficiency due to classical gravity is suppressed by the fermion mass. Quantum effects, on other hand, are expected break conformal invariance sector Planck scale-suppressed operators irrespective find that very efficient in immediately inflation, generating a significant background stable or long-lived feebly interacting particles. This applies, particular, which can...

We construct the manifestly gauge invariant effective Lagrangian in $3+1$ dimensions describing standard model $4+1$ dimensions, following transverse lattice technique. incorporate split generation fermions and we explore naturalness for two Higgs configurations: a universal vacuum expectation value (VEV), common to each brane, local VEV centered on single brane with discrete exponential attenuation other branes, emulating split-generation model. Extra explicit configurations, do not...