Quark flavour-violating Higgs decays at the ILC

Barducci, D.; Helmboldt, Alexander J.

doi:10.1007/jhep12(2017)105

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…So far, LHC has measured couplings with fermions of the 3rd generation, and there is some chance to measure couplings with charm and muons, which will permit to test the private Higgs hypothesis. At linear colliders it will be possible to measure these couplings with better precision; more recently there have appeared some claims that the coupling with strange quarks is also possible, both the flavor-conserving [139] and flavor-violating ones [140]. Furthermore, this could also be possible within the models with Higgs portal to dark matter, In such case, the direct detection of DM depends on the Higgs interaction with nucleons, which in turn depends on the Higgs coupling with light quarks.…”

Section: Discussionmentioning

confidence: 99%

The Higgs profile in the standard model and beyond

Díaz-Cruz¹

2019

Rev. Mex. Fís.

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We present a review of Higgs physics in the SM and beyond, including the tests of the Higgs boson properties that have been performed at LHC and have permitted to delineate its profile. After presenting the essential features of the BEH mechanism, and its implementation in the SM, we discuss how the Higgs mass limits developed over the years. These constraints in turn helped to classify the Higgs phenomenology (decays and production mechanisms), which provided the right direction to search for the Higgs particle, an enterprise that culminated with its discovery at LHC. So far, the constraints on the couplings of the Higgs particle, point towards a SM interpretation. However, the SM has open ends that suggest the need to look for extensions of the model. We discuss in general the connection of the Higgs sector with some new physics (e.g. supersymmetry, flavor and Dark matter), with special focus on a more flavored Higgs sector. Thus is realized in the most general 2HDM, and its textured version, which we study in general, and for its various limits, which contain distinctive flavor-violating signals that could be searched at current and future colliders.

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Section: Discussionmentioning

confidence: 99%

The Higgs profile in the standard model and beyond

Díaz-Cruz¹

2019

Rev. Mex. Fís.

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“…In our model, the upper limits for the branching ratios of h → q i q j are predicted to decrease by 1 1+ 1 k times that of the predictions in [84,85]; for details see Table 1. The weakest constraints are in the b-s sector, Br(hbs) < 3.5 × 10 −3 , which is too small to be observed at the LHC because of the large QCD backgrounds, but these signals are expected to be observed at the ILC [94] in the future.…”

Section: (G − 2) μmentioning

confidence: 98%

Investigation of the Higgs boson anomalous FCNC interactions in the simple 3-3-1 model

Huong¹,

Duy²

2020

Eur. Phys. J. C

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We study phenomenological constraints on the simple 3-3-1 model with flavor-violating Yukawa couplings. Both Higgs triplets couple to leptons and quarks, which generates flavor-violating signals in both lepton and quark sectors. We have shown that this model allows for a large Higgs lepton flavor-violating rate decay $$h \rightarrow \mu \tau $$h→μτ and also may reach perfect agreement with other experimental constraints such as $$\tau \rightarrow \mu \gamma $$τ→μγ and $$(g-2)_\mu $$(g-2)μ. The contributions of flavor-changing neutral current couplings, Higgs–quark–quark couplings, mixing to the mesons are investigated. Br$$(h \rightarrow q q^\prime )$$(h→qq′) can be enhanced acknowledging the measurements of meson mixing. The branching ratio for $$t \rightarrow q h$$t→qh can reach up to $$10^{-3}$$10-3, but it could be as low as $$10^{-8}$$10-8.

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“…[22,23]). Concerning flavor-changing couplings of h to other quarks, the LHC experiments have little direct sensitivity [24], while the ILC could in principle reach subpercent sensitivity for the branching ratios of h → bs, bd [25]; in Ref. [26], it was found that BR(h → bs) can be as large as 10 −1 in Two-Higgs-Doublet Models (2HDM).…”

Section: Contentsmentioning

confidence: 99%

Higgs Quark Flavor Violation: Simplified Models and Status of General Two-Higgs-Doublet Model

Herrero-García

Nebot

Rajec

et al. 2020

J. High Energ. Phys.

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We study quark flavor violating interactions mediated by the Higgs boson h. We consider observables involving a third generation quark, of both the up and the down quark sectors, like h → bs and t → ch. Using an effective field theory approach we systematically list all the possible tree-level ultraviolet completions, which comprise models with vector-like quarks and/or extra scalars. We provide upper bounds on the flavor violating transitions allowed by current limits stemming from low energy processes, such as meson mixing and b → sγ. We find that scenarios with vector-like quarks always have very suppressed flavor-violating transitions, while a general two Higgs doublet model may have a sizeable rate. To study the latter case in detail, we perform a full numerical simulation taking into account all relevant theoretical and phenomenological constraints. Our results show that BR(t → ch) [BR(h → bs)] are still allowed at the subpercent [percent] level, which are being [may be] explored at the LHC [future colliders]. Finally, we have found that the mild mass-splitting discrepancy with respect to the SM in the B s meson system can be accommodated in the Two-Higgs-Doublet Model. If confirmed, it yields the prediction BR(h → bs) 10 −4 , if the new contribution to the mass-splitting is dominated by tree-level Higgs boson exchange.

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Quark flavour-violating Higgs decays at the ILC

Cited by 15 publications

References 30 publications

The Higgs profile in the standard model and beyond

The Higgs profile in the standard model and beyond

Investigation of the Higgs boson anomalous FCNC interactions in the simple 3-3-1 model

Higgs Quark Flavor Violation: Simplified Models and Status of General Two-Higgs-Doublet Model

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