Chaehyun Yu

B → D (*) τν and B → τν in chiral U(1)′ models with flavored multi Higgs doublets

A bstractWe discuss semileptonic and leptonic B decays, B → D(∗)τν and B → τν, in the chiral U(1)′ models which were proposed by the present authors in the context of the top forward-backward asymmetry

A resolution of the flavor problem of two Higgs doublet models with an extra U(1)H symmetry for Higgs flavor

\left( {A_{\mathrm{FB}}^t} \right)

LHCb anomaly and B physics in flavored Z′ models with flavored Higgs doublets

observed at the Tevatron. In these models, extra Higgs doublets with nonzero U(1)′ charges are required in order to make the realistic mass matrix for up-type quarks. Then the extra (pseudo)scalars contribute to

Chiral U(1) flavor models and flavored Higgs doublets: the top FB asymmetry and the W jj

A_{\mathrm{FB}}^t

Higgs phenomenology in Type-I 2HDM with U(1)H Higgs gauge symmetry

with large flavor-changing Yukawa couplings involving top quark. The contribution of the charged Higgs to

Dijet resonance from leptophobic Z′ and light baryonic cold dark matter

A_{\mathrm{FB}}^t

Dark matter and dark force in the type-I inert 2HDM with local U(1) H gauge symmetry

is negligible, but it may significantly affect B decays: especially, B → D(*)τν and B → τν. We investigate constraints on the B decays, based on the recent results in BaBar and Belle experiments, and discuss the possibility that the allowed parameter region in the B decays can achieve large

Higgs and dark matter physics in the type-II two-Higgs-doublet model inspired by E 6 GUT

A_{\mathrm{FB}}^t

Multi-Higgs doublet models with local U(1)H gauge symmetry and neutrino physics therein

.

Top Forward-Backward Asymmetry and the CDF

Abstract We propose to implement the Natural Flavor Conservation criterion in the two Higgs doublet model (2HDM) to an extra U ( 1 ) H gauge symmetry for Higgs flavor, assuming two Higgs doublets carry different U ( 1 ) H charges. Then one can easily avoid the tree-level FCNC from neutral Higgs mediations using local gauge symmetries, instead of softly broken ad hoc Z 2 symmetry, and the pseudoscalar boson could be eaten by extra Z H boson. Imposing the anomaly cancellation, we find that the U ( 1 ) H in the Type-II and Type-IV 2HDMs become leptophobic and leptophilic, respectively. For the Type-I case, U ( 1 ) H depends on two parameters, and some simple cases include U ( 1 ) H = U ( 1 ) B − L , U ( 1 ) R , or U ( 1 ) Y . We sketch qualitative phenomenology of these models.