Fully covering the MSSM Higgs sector at the LHC

Djouadi, Abdelhak; Maiani, L.; Polosa, A. D.; Quevillon, Jérémie; Riquer, V.

doi:10.1007/jhep06(2015)168

Cited by 133 publications

(199 citation statements)

References 140 publications

(252 reference statements)

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“…Many supersymmetric models also provide a candidate for a dark-matter particle. In the Minimal Supersymmetric Standard Model [74][75][76][77][78][79][80], the mass matrix of the neutral CP-even Higgs bosons h and H can be written as [81]:…”

Section: Simplified Minimal Supersymmetric Standard Modelmentioning

confidence: 99%

“…be expressed as functions of the free parameters [m A , tan β] (in addition to m h ) as [81][82][83]:…”

Section: Jhep11(2015)206mentioning

confidence: 99%

“…These are generally sub-dominant effects [81][82][83] and are not included. The MSSM includes other possibilities such as Higgs boson decays to supersymmetric particles, decays of heavy Higgs bosons to lighter ones [86], and effects from light supersymmetric particles [84], which are not investigated here.…”

Section: Jhep11(2015)206mentioning

confidence: 99%

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Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

Aad

Bergeås

Brenner

et al. 2015

J. High Energ. Phys.

190

198

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Abstract:The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb −1 of pp collision data at √ s = 7 TeV and 20.3 fb −1 at √ s = 8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the γγ, ZZ, W W , Zγ, bb, τ τ , and µµ decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. Limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the γγ and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of m A > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → , W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. The use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter. Conclusions 26The ATLAS collaboration 36 IntroductionThe ATLAS and CMS Collaborations at the Large Hadron Collider (LHC) announced the discovery of a particle consistent with a Higgs boson in 2012 [1,2]. Since then, the collaborations have together measured the mass of the particle to be about 125 GeV [3][4][5]. Studies of its spin and parity in bosonic decays have found it to be compatible with a J P = 0 + state [6][7][8]. Combined coupling fits of the measured Higgs boson production and decay rates within the framework of the Standard Model (SM) have found no significant deviation from the SM expectations [4,9, 10]. These results strongly suggest that the newly discovered particle is indeed a Higgs boson and that a non-zero vacuum expectation value of a Higgs doublet is responsible for electroweak (EW) symmetry breaking [11][12][13].The observed CP-even Higgs boson is denoted as h throughout this paper. A crucial question is whether there is only one Higgs doublet, as postulated by the SM, or whether the Higgs sector is more complex, for example with a second doublet leading to more than one Higgs boson of which one has properties similar to those of the SM Higgs -1 - JHEP11(2015)206boson, as predicted in many theories beyond the Standard Model (BSM). 1 The "hierarchy problem" regarding the naturalness of the Higgs boson mass, the nature of dark matter, and other open questions that the SM is not able to answer also motivate the search for additional new particles and interactions. Astrophysical observations provide strong evidence of dark matter that could be explained by the e...

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Section: Simplified Minimal Supersymmetric Standard Modelmentioning

confidence: 99%

“…be expressed as functions of the free parameters [m A , tan β] (in addition to m h ) as [81][82][83]:…”

Section: Jhep11(2015)206mentioning

confidence: 99%

See 1 more Smart Citation

Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

Aad

Bergeås

Brenner

et al. 2015

J. High Energ. Phys.

190

198

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“…We include the upper bounds on Br(t → H + b) × Br(H + → τ + ν τ ). reported the tt resonance search results [75], the interpretation is very challenging at a hadron collider because the interference with the QCD continuum background causes various shapes in the tt invariant mass distribution [76][77][78]. Since the interference effects have not been included yet in the experiment analysis, we do not consider this tt channel.…”

Section: B Pre-lhc Boundsmentioning

confidence: 99%

Higgs potential and hidden light Higgs scenario in two Higgs doublet models

et al. 2015

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In two Higgs doublet models, there exists an interesting possibility, the hidden light Higgs scenario, that the discovered SM-like Higgs boson is the heavier CP -even Higgs boson H 0 and the lighter CP -even h 0 has not been observed yet in any experiment. We study the current status of this scenario in Types I, II, X, and Y, through the scans of the parameters with all relevant theoretical and experimental constraints. We employ not only the most up-to-date Higgs signal strength measurements with the feed-down effects, but also all the available LHC exclusion limits from heavy Higgs searches. Adjusting the heavier H 0 to the 125 GeV state while hiding the lighter h 0 from the LEP Higgs search prohibits the extreme decoupling limit: there exist upper bounds on the masses of the pseudoscalar A 0 and the charged Higgs H ± below about 600 GeV. In addition, the Z 2 symmetry is shown to be a good approximate symmetry since the soft Z 2 symmetry breaking parameter m 2 12 should be less than about (45 GeV) 2 . Most interestingly, a few parameters in the Higgs potential and the related Higgs triple and quartic couplings are shown to be meaningfully constrained by the current data. The double Higgs-strahlung process at an e + e − collider is also studied.

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“…The CP-even Higgs bosons are rotated to their physical basis by a mixing angle α which we set to be α = β − π/2 corresponding to the decoupling limit when the pseudo-scalar Higgs mass is much heavier than the mass of the Z gauge boson, as indicated by the experimental data [86,87] and appropriate to our scenario of light stops. 8 When comparing the EFT and MSSM amplitudes we may choose the momenta of the external particles to be on-shell for convenience.…”

Section: Jhep06(2015)028mentioning

confidence: 99%

Comparing EFT and exact one-loop analyses of non-degenerate stops

Drozd

Ellis

Quevillon

et al. 2015

J. High Energ. Phys.

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We develop a universal approach to the one-loop effective field theory (EFT) using the Covariant Derivative Expansion (CDE) method. We generalise previous results to include broader classes of UV models, showing how expressions previously obtained assuming degenerate heavy-particle masses can be extended to non-degenerate cases. We apply our method to the general MSSM with non-degenerate stop squarks, illustrating our approach with calculations of the coefficients of dimension-6 operators contributing to the hgg and hγγ couplings, and comparing with exact calculations of one-loop Feynman diagrams. We then use present and projected future sensitivities to these operator coefficients to obtain present and possible future indirect constraints on stop masses. The current sensitivity is already comparable to that of direct LHC searches, and future FCC-ee measurements could be sensitive to stop masses above a TeV. The universality of our one-loop EFT approach facilitates extending these constraints to a broader class of UV models.

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Fully covering the MSSM Higgs sector at the LHC

Cited by 133 publications

References 140 publications

Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector

Higgs potential and hidden light Higgs scenario in two Higgs doublet models

Comparing EFT and exact one-loop analyses of non-degenerate stops

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