Current measurements of the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>h</a:mi><a:mo stretchy="false">→</a:mo><a:mi>Z</a:mi><a:mi>γ</a:mi></a:math> signal strength invite us to speculate about possible new physics interactions that exclusively affect <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:msub><d:mrow><d:mi>μ</d:mi></d:mrow><d:mrow><d:mi>Z</d:mi><d:mi>γ</d:mi></d:mrow></d:msub></d:mrow></d:math> without altering other...

We study the conditions required to make 2HDM scalar potential stable up Planck scale. The lightest CP-even is assumed have been found at LHC and {\em alignment limit} imposed in view of Higgs data. find that ensuring stability scales $\gtrsim 10^{10}$~GeV necessitates introduction a soft breaking parameter theory. Even then, some interesting correlations between nonstandard masses need be satisfied. Consequently, becomes completely determined by only two parameters, namely, $\tb$ mass...

We investigate the scalar potential of a general ${S}_{3}$-symmetric three-Higgs-doublet model. The outcome our analysis does not depend on fermionic sector identify decoupling limit for spectrum this scenario. In view recent LHC Higgs data, we show numerical results only in limit. Unitarity and stability demand that many new scalars must be lurking below 1 TeV. provide predictions $h\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$...

A large class of two- and three-Higgs-doublet models with discrete symmetries has been employed in the literature to address various aspects flavor physics. We analyze how precision measurement Higgs diphoton signal strength would severely constrain these scenarios due nondecoupling behavior charged scalars, extent that presence exact symmetry, number additional noninert scalar doublets can be constrained no matter heavy nonstandard scalars are. demonstrate if potential is endowed...

In a truly model-independent approach, we reexamine minimal extension of the Standard Model (SM) through introduction an additional $U(1)$ symmetry leading to new neutral gauge boson ($Z'$), allowing its kinetic mixing with hypercharge boson. An SM scalar is used spontaneously break this extra mass $Z'$. Except for three right-handed neutrinos no other fermions are added. We use current LHC Drell-Yan data put constraints in parameter space quantities, namely, $M_{Z'}$, $Z$-$Z'$ angle...

We show that in the Higgs triplet model, after discovery, mixing angle $CP$-even sector can be strongly constrained from unitarity. also discuss how large quantum effects $h\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ may arise a Standard-Model-like scenario and certain part of parameter space ruled out diphoton signal strength. Using $T$-parameter strength measurements, we update bounds on nonstandard scalar masses.

LHC searches for nonstandard scalars in vector boson fusion (VBF) production processes can be particularly efficient probing belonging to triplet or higher multiplet representations of the Standard Model $SU(2{)}_{L}$ gauge group. They especially relevant models where additional do not have any tree level couplings fermions, rendering VBF as their primary mode at LHC. In this work we employ latest data from resonance constrain properties scalars, taking Georgi-Machacek model a prototypical...

Charged scalars appear in many motivated extensions beyond the Standard Model. We analyze constraints on charged scalar pair production via Drell-Yan process at Large Hadron Collider and interpret them terms of weak isospin quantum numbers. Leveraging experimental limits from existing LHC data phenomenological recast analyses, we place bounds branching ratio scalar, as a function its mass, electric charge, isospin. This approach enables to determine ratios directly data, without appealing...

Prompted by the recent observation of a Higgs-like particle at CERN Large Hadron Collider, we investigate quantitative correlation between possible departures gauge and Yukawa couplings this from their Standard Model expectations scale unitarity violation in processes $WW\ensuremath{\rightarrow}WW$ $t\overline{t}\ensuremath{\rightarrow}WW$.

We show that the $2.4\ensuremath{\sigma}$ signal of leptonic flavor violating (LFV) Higgs boson decay $h\ensuremath{\rightarrow}\ensuremath{\mu}\ensuremath{\tau}$, as observed by CMS Collaboration recently, can be explained a certain class two-Higgs doublet models allow controllable flavor-changing neutral current with minimal number free parameters. postulate (i) alignment limit is maintained, which means lightest scalar ($h$) has identical couplings to Standard Model and (ii) comes from...

We demonstrate that light charged and extra neutral scalars in the (100--200) GeV mass range pass potentially dangerous flavor constraints a particular class of two-Higgs-doublet model which has appropriately suppressed flavor-changing currents at tree level. study their decay branching ratios into various fermionic final states comment on possibility detection collider experiments. also remark how trademark signatures can be used to discriminate them from nonstandard predicted other models.

We impose an $S_3$ symmetry on the quark fields under which two of three quarks transform like a doublet and remaining one as singlet, use scalar sector with same structure $SU(2)$ doublets. After gauge breaking, $\mathbb{Z}_2$ subgroup remains unbroken. show that this unbroken can explain approximate block CKM matrix. By allowing soft breaking in sector, we generate small elements, quadratic or higher order Wolfenstein parametrization also predict existence exotic new scalars,...

The LHC Higgs data is showing a gradual inclination towards the SM result and realization of an SM-like limit becomes essential for BSM scenarios to survive. Considering accuracy that can be achieved in future colliders, BSMs acquire alignment with boson coupling surpass others long run. Using convenient parametrization, we demonstrate CP-conserving 3HDMs takes on same analytic structure as case 2HDMs. example $Z_3$-symmetric 3HDM, illustrate how such conditions efficiently implemented...

Contrary to the common perception, we show that current Higgs data does not eliminate possibility of a sequential fourth generation get their masses through same mechanism as first three generations. The inability fix sign bottom-quark Yukawa coupling from available plays crucial role in accommodating chiral which is consistent with bounds on signal strengths. We effects such can remain completely hidden only production boson gluon fusion but also its subsequent decay $\gamma\gamma$ and $...

We show that in the absence of trilinear terms scalar potential Georgi-Machacek model, heavy charged scalars do not necessarily decouple from $h \to \gamma \gamma$ decay amplitude. In such scenarios, measurement Higgs to diphoton signal strength can place stringent constraints parameter space. Using projected precisions at High Luminosity LHC (HL-LHC) and ILC, we find upper bound on triplet vacuum expectation value be as low 10 GeV. also found when combined with theoretical perturbative...

The stringent constraints from the direct searches for exotic scalars at LHC as well indirect bounds flavor physics measurements have imposed severe restrictions on parameter space of new models featuring extended Higgs sectors. In Type-II 2HDM, this implies a lower bound charged masses $\cal O$(600 GeV). work we analyze phenomenology Z3HDM in alignment limit focusing impact its space. We show that couplings two bosons model feature an additional suppression factor compared to 2HDM. This...

We construct a model where the smallness of masses first quark generations implies near block diagonal nature Cabibbo-Kobayashi-Maskawa matrix and vice versa. For this setup, we rely on two Higgs-doublet structure with an ${S}_{3}$ symmetry. show that SM-like Higgs emerges naturally from such construction. Moreover, ratio VEVs, $\mathrm{tan}\ensuremath{\beta}$, can be precisely determined requirement masslessness up- down-quarks. The flavor changing neutral current arises our is also very predictive.

In two-Higgs-doublet models with exact [Formula: see text] symmetry, putting at the alignment limit, following limits on heavy scalar masses are obtained from conditions of unitarity and stability potential: text], text]. The constraints neutral meson mass differences, when superimposed constraints, put a tighter lower limit depending It has also been shown that larger values can be allowed by introducing soft breaking term in potential expense correlation between parameter.

A bstract We construct a three-Higgs doublet model with flavour non-universal U(1) × ℤ 2 symmetry. That symmetry induces suppressed flavour-changing interactions mediated by neutral scalars. New scalars masses below the TeV scale can still successfully negotiate constraints arising from data. Such thus encourage direct searches for extra Higgs bosons in future collider experiments, and includes non-trivial structure.

We propose a model where neutrino masses are generated at three loop order but neutrinoless double beta decay occurs one loop. Thus we can have large observable in the future experiments even when very small. The receives strong constraints from data and lepton flavor violating decays, which substantially reduces number of free parameters. Our also opens up possibility having several new scalars below TeV regime, be explored collider experiments. Additionally, our has an unbroken Z 2...

We show that the $2.4σ$ signal of leptonic flavor violating (LFV) Higgs boson decay $h\toμτ$, as observed by CMS collaboration recently, can be explained a certain class two-Higgs doublet models allow controllable flavor-changing neutral current with minimal number free parameters. postulate (i) alignment limit is maintained, which means lightest scalar ($h$) has identical couplings to Standard Model and (ii) comes from two other scalars, CP-even $H$ CP-odd $A$, almost degenerate $h$ at 125...