Exotic decays of the 125 GeV Higgs boson

Curtin, David; Essig, Rouven; Gori, Stefania; Jaiswal, Prerit; Katz, Andrey; Liu, Tao; Liu, Zhen; McKeen, David; Shelton, Jessie; Strassler, Matthew J.; Surujon, Ze'ev; Tweedie, Brock; Zhong, Yi

doi:10.1103/physrevd.90.075004

Cited by 347 publications

(490 citation statements)

References 301 publications

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“…Final states with large missing transverse momentum associated with leptons or jets offer the possibility of direct searches for h → invisible [104][105][106][107][108][109][110][111]. In these searches, no excess of events was found and upper limits were set on the Higgs boson production cross section times the branching ratio for h → invisible decays.…”

Section: Direct Searches For Invisible Decaysmentioning

confidence: 99%

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: Direct Searches For Invisible Decaysmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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“…The presence of new particles can bring about modifications to the standard decay modes of the Higgs and/or cause it to undergo exotic decays [79]. As data from the LHC continues to accumulate with increasing precision, they may uncover clues of new physics in the Higgs couplings.…”

Section: Flavor-violating Higgs Decaymentioning

confidence: 99%

“…Due to the lnΛ dependence of y new bd , we also set κ LR = 1. It follows that, for illustration, we can select m S 3 , Λ = (70,79) and (200,78) GeV from the LR (blue) curve in figure 2, implying that we have assumed λ 3 to be negligible. Choosing also λ 1 = λ 2 for simplification, we find that for m S 3 , Λ = (70, 79) GeV the S k contributions lead to 0.0026 > y new µτ,τ µ m τ /v > 0.0021, or 0.79% > B(h → µτ ) > 0.52%, compatible with the range of the CMS finding on the potential signal [80], if −7.2 < λ 1 < −5.8.…”

Section: Flavor-violating Higgs Decaymentioning

confidence: 99%

Lepton-flavored scalar dark matter with minimal flavor violation

Lee

Tandean

2015

J. High Energ. Phys.

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We explore scalar dark matter that is part of a lepton flavor triplet satisfying symmetry requirements under the hypothesis of minimal flavor violation. Beyond the standard model, the theory contains in addition three right-handed neutrinos that participate in the seesaw mechanism for light neutrino mass generation. The dark-matter candidate couples to standard-model particles via Higgs-portal renormalizable interactions as well as to leptons through dimension-six operators, all of which have minimal flavor violation built-in. We consider restrictions on the new scalars from the Higgs boson measurements, observed relic density, dark-matter direct detection experiments, LEP II measurements on e + e − scattering into a photon plus missing energy, and searches for flavor-violating lepton decays. The viable parameter space can be tested further with future data. Also, we investigate the possibility of the new scalars' couplings accounting for the tentative hint of Higgs flavor-violating decay h → µτ recently detected in the CMS experiment. They are allowed by constraints from other Higgs data to produce a rate of this decay roughly compatible with the CMS finding.

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“…The fact that the observed boson has features which, at least in the broad brush, match with the SM expectations confirms that it is the principle agent of electroweak symmetry breaking. A major focus of the LHC run II is to establish its properties to high precision to either confirm the SM vision for electroweak breaking or to find the influence of new physics [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%