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

Ko, Pyungwon; Omura, Yuji; Yu, Chaehyun

doi:10.1007/jhep03(2013)151

Cited by 70 publications

(35 citation statements)

References 22 publications

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“…First the study of these decays in 2HDM of type III [189,190] and in NP models with general flavour structure [191]. Moreover in [192] 2HDM and 3HDM models with the nonminimal flavor violations originating from flavour-dependent gauge interactions have been analyzed. It is to be seen whether this anomaly remains when the data improve.…”

Section: Tree-level Scalar Exchangesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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We outline a systematic strategy which should help in this decade to identify New Physics (NP) beyond the Standard Model (SM) by means of quark flavour violating processes and thereby to extend the picture of short distance physics down to the scales as short as 10 −20 m and even shorter distance scales corresponding to energies of 100 TeV. Rather than using all possible flavour violating observables that will be measured in the coming years at the LHC, SuperKEKB and in Kaon physics dedicated experiments at CERN, J-PARC and Fermilab, we concentrate on those observables that are theoretically clean and very sensitive to NP. Assuming that the data on the selected observables by us will be very precise, we stress the importance of correlations between these observables as well as of future precise calculations of non-perturbative parameters by means of lattice QCD simulations with dynamical fermions. Our strategy consists of twelve steps which we will discuss in detail illustrating possible outcomes with the help of the SM, models with constrained Minimal Flavour Violation (CMFV), MFV at large and models with tree-level FCNCs mediated by neutral gauge bosons and scalars. We also briefly summarize the status of a number of concrete models. We propose DNA-charts that exhibit correlations between flavour observables in different NP scenarios. The models with new left-handed and/or right-handed currents and non-MFV interactions can be distinguished transparently in this manner. We emphasize the important role of the stringent CMFV relations between various observables as standard candles of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario. The success of this program will be very much facilitated through direct signals of NP at the LHC even if LHC will not be able to probe the physics at scales shorter than 4×10 −20 m. We also emphasize the importance of lepton flavour violation, electric dipole moments and (g − 2) e,µ in these studies.

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Section: Tree-level Scalar Exchangesmentioning

confidence: 99%

Towards the identification of new physics through quark flavour violating processes

2014

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“…And small neutrino masses may naturally be generated by one-loop diagram in some 2HDMs [12]. Finally, it is very interesting that in 2HDMs with flavor-dependent U(1) H gauge symmetry, the anomalies in the top forward-backward asymmetry at the Tevatron and B → D ( * ) τ ν decays at BABAR may be reconciled [13][14][15][16][17][18].…”

Section: Jhep11(2014)054mentioning

confidence: 99%

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

Ko¹,

Omura

Yu³

2014

J. High Energ. Phys.

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We discuss dark matter (DM) physics in the Type-I inert two-Higgs-doublet model (2HDM) with local U(1) H Higgs gauge symmetry, which is assigned to the extra Higgs doublet in order to avoid the Higgs-mediated flavor problems. In this gauged inert DM setup, a U(1) H -charged scalar Φ is also introduced to break U(1) H spontaneously through its nonzero vacuum expectation value (VEV), Φ , and then the remnant discrete subgroup appears according to the U(1) H charge assignment of Φ. The U(1) H -charged Higgs doublet does not have Yukawa couplings with the Standard-Model (SM) fermions, and its lightest neutral scalar component H is stable because of the remnant discrete symmetry. In order to suppress a too large Z-exchange diagram contribution in DM direct detection experiments, we have to introduce a non-renormalizable operator which can be generated by integrating out an extra heavy scalar. With these new particles contents, we first investigate the constraint on the U(1) H gauge interaction, especially through the kinetic and mass mixing between the SM gauge bosons and the extra gauge boson. Then we discuss dark matter physics in our 2HDM: thermal relic density, and direct/indirect detections of dark matter. The additional U(1) H gauge interaction plays a crucial role in reducing the DM thermal relic density. The most important result within the inert DM model with local U(1) H symmetry is that ∼ O(10) GeV dark matter scenario, which is strongly disfavored in the usual Inert Doublet Model (IDM) with Z 2 symmetry, is revived in our model because of newly open channels, HH → Z H Z H , Z H Z. Exotic Higgs decays, h → Z H Z H , ZZ H , would be distinctive signatures of the inert 2HDM with local U(1) H symmetry.

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“…The BABAR measurement for this branching ratio indicates that the SM as well as the type-II 2HDM would be excluded with 99.8% probability [60]. This problem would require breaking of the so-called Natural Flavor Conservation criteria, which could be realized in the flavordependent U(1) model [61]. However, this breaking cannot be achieved in the 2HDM U(1) and the anomaly cannot be accommodated with this model.…”

Section: Constraints On the Charged Higgs Bosonmentioning

confidence: 99%

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

Ko¹,

Omura

Yu³

2015

J. High Energ. Phys.

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Abstract:We study Higgs and dark matter physics in the type-II two-Higgs-doublet model (2HDM) with an extra U(1) H gauge symmetry, inspired by the E 6 grand unified theory (GUT). From the viewpoint of the bottom-up approach, the additional U(1) H gauge symmetry plays a crucial role in avoiding the tree-level flavor changing neutral currents mediated by neutral Higgs bosons in general 2HDMs. In the model with U(1) H gauge symmetry, which has Type-II Yukawa couplings, we have to introduce additional chiral fermions that are charged under the U(1) H gauge symmetry as well as under the StandardModel (SM) gauge symmetry in order to cancel chiral gauge anomalies. For the U(1) H charge assignment and the extra matters, we adopt the ones inspired by the E 6 GUT: the extra quark-like and lepton-like fermions with the non-trivial U(1) H charges. We discuss their contributions to the physical observables, such as the measurements of Higgs physics and electro-weak interactions, and investigate the consistency with the experimental results. Furthermore, we could find extra neutral particles like the SM neutrinos after the electro-weak symmetry breaking, and they could be stable, because of the remnant symmetry after U(1) H symmetry breaking. We also discuss the thermal relic density and the (in)direct-detections of this dark matter candidate.

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

Cited by 70 publications

References 22 publications

Towards the identification of new physics through quark flavour violating processes

Towards the identification of new physics through quark flavour violating processes

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

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

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