Wrong sign bottom Yukawa coupling in low energy supersymmetry

Coyle, Nina M.; Li, Bing; Wagner, Carlos E. M.

doi:10.1103/physrevd.97.115028

“…Inspection of Fig. 4 shows that the deviation of the parameter |η| is below 0.1 for the majority of points, restricting the deviations of all couplings to values below ten percent, in agreement with current experimental observations [51][52][53] (in this work, we shall not consider the region in which the bottom Yukawa coupling acquires a wrong sign, η 2, which can also be achieved within the NMSSM for heavy singlets [54]). The points on the extreme ends of the tan β region reach larger values of |η|, but do not exceed a deviation of 0.16.…”

Section: A Results Of Running Gut-scale Parameters To Weak Scalesupporting

confidence: 86%

Dynamical Higgs field alignment in the NMSSM

Coyle

¹

,

Wagner

²

2020

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Experimental probes of the recently discovered Higgs boson show that its behavior is close to that of the Standard Model (SM) Higgs particle. Extensions of the SM which include extra Higgs bosons are constrained by these observations, implying either the decoupling of the heavy non-standard Higgs particles or the realization of alignment, associated with vanishing mixing of the SM-like Higgs boson with the non-standard ones. Quite generally, alignment is not enforced by symmetry considerations and hence it is interesting to look for dynamical ways in which this condition can be realized. We show that this is possible in the Next-to-Minimal Supersymmetric Standard Model (NMSSM), in which alignment is achieved for values of the coupling of the Higgs fields to the singlet field that become large close to the Grand Unification (GUT) scale. This, in turn, can be explained by the composite nature of the Higgs fields, with a compositeness scale close to the GUT scale. In this article we present this dynamical scenario and discuss its phenomenological properties.This paper is structured as follows. In Section II, we review the alignment limit of the NMSSM and the relevant conditions on the parameters necessary for alignment. In Section III, we present results from the running of the NMSSM parameters and examine the range of GUT-scale parameter values for which alignment is obtained in the doublet and singlet sectors. We then present an implementation of a Fat Higgs theory which runs down to alignment at the weak scale in Section IV. In Section V, we examine the bottom-and tau-Yukawa unification for our set of low-energy parameters. Finally, in Section VI we present our conclusions. II. THE ALIGNMENT LIMIT OF THE NMSSMWithin the NMSSM Higgs sector, which contains two doublets and a singlet, there are two methods through which one may obtain a SM-like Higgs of 125 GeV: decoupling and alignment. In the decoupling case, the heavier non-standard Higgs bosons are pushed to high masses, such that the mixing with the SM-like Higgs boson is suppressed. In the case of alignment, the parameters of the Higgs sector are such that the mixing terms of the squared-mass matrix between the SM-like Higgs boson and the neutral, non-SM-like one and singlet are small. More specifically, if we work in the Higgs basis [16,17] in which only one of the doublets acquires a vacuum expectation value and hence is aligned with the SM Higgs doublet, here denoted by the subscript 1, the symmetric CP-even Higgs mass-squared matrix is given generally by M 2 =      M 2 11 M 2 12 M 2 13 M 2 22

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“…In this case, C h b is negative and thus leads to wrong sign Yukawa couplings [20], and one needs a large λ beyond the perturbativity bound [34]. the Higgs searches in the Z -boson associated Higgs production (e + e − → Z ϕ) at LEP [5].…”

Section: Lep and Cms Excesses Around 96 Gevmentioning

confidence: 99%

Light Higgs bosons in the general NMSSM

Choi

¹

,

Im

²

,

Jeong

³

et al. 2019

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Physics beyond the Standard Model (SM) may manifest itself as small deviations from the SM predictions for Higgs signal strengths at 125 GeV. Then, a plausible and interesting possibility is that the Higgs sector is extended and at the weak scale there appears an additional Higgs boson weakly coupled to the SM sector. Combined with the LEP excess in e + e − → Z (h → bb), the diphoton excess around 96 GeV recently reported by CMS may suggest such a possibility. We examine if those LEP and CMS excesses can be explained simultaneously by a singlet-like Higgs boson in the general next-to-minimal supersymmetric Standard Model (NMSSM). Higgs mixing in the NMSSM relies on the singlet coupling to the MSSM Higgs doublets and the higgsino mass parameter, and thus is subject to the constraints on these supersymmetric parameters. We find that the NMSSM can account for both the LEP and CMS excesses at 96 GeV while accommodating the observed 125 GeV SM-like Higgs boson. Interestingly, the required mixing angles constrain the heavy doublet Higgs boson to be heavier than about 500 GeV. We also show that the viable region of mixing parameter space is considerably modified if the higgsino mass parameter is around the weak scale, mainly because of the Higgs coupling to photons induced by the charged higgsinos.

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“…Since the improvements of various experiments, the wrong-sign region have attracted fruitful researches [7][8][9][10][11][12][13][14][15][16]. This work focuses on testing the so-called wrong-sign Yukawa region up to one-loop level with both indirect and direct searches at current LHC.…”

Section: Introductionmentioning

confidence: 99%

Probing loop effects in wrong-sign Yukawa coupling region of Type-II 2HDM

Su

¹

2021

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In the framework of 2HDM, we explore the wrong-sign Yukawa region with direct and indirect searches up to one-loop level. The direct searches include the latest $$H/A \rightarrow f{\bar{f}}, VV, Vh, hh$$ H / A → f f ¯ , V V , V h , h h reports at current LHC, and the study of indirect Higgs precision measurements works with current LHC, future HL-LHC and CEPC. At tree level of Type-II 2HDM, for degenerate heavy Higgs mass $$m_A=m_H=m_{H^\pm }<800$$ m A = m H = m H ± < 800 GeV, the wrong-sign Yukawa regions are excluded largely except for the tiny allowed region around $$\cos (\beta -\alpha )\in (0.2,0.3)$$ cos ( β - α ) ∈ ( 0.2 , 0.3 ) under the combined Higgs constraints. The excluded region is also nearly independent of parameter $$m_{12}$$ m 12 or $$\lambda v^2=m_A^2-m_{12}^2/(\sin \beta \cos \beta )$$ λ v 2 = m A 2 - m 12 2 / ( sin β cos β ) . The situation changes a lot after including loop corrections to the indirect searches, for example $$m_A=1500 \text {~GeV}$$ m A = 1500 GeV , the region with $$\lambda v^2<0$$ λ v 2 < 0 will be stronger constrained to be totally excluded. Whilst parameter space with $$\lambda v^2>0$$ λ v 2 > 0 would get larger survived wrong-sign region for $$m_A=800 ~\text {~GeV}$$ m A = 800 GeV compared to it at tree level. We also conclude Higgs direct searches works better on constraining $$\lambda v^2 \approx 0$$ λ v 2 ≈ 0 GeV range than theoretical constraints. We also find that the loop-level wrong-sign Yukawa limit only occurs at mass decoupling scale.

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Wrong sign bottom Yukawa coupling in low energy supersymmetry

Cited by 16 publications

References 109 publications

Dynamical Higgs field alignment in the NMSSM

Dynamical Higgs field alignment in the NMSSM

Light Higgs bosons in the general NMSSM

Probing loop effects in wrong-sign Yukawa coupling region of Type-II 2HDM

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