Light (and darkness) from a light hidden Higgs

Vega, Roberto; Vega-Morales, Roberto; Xie, Keping

doi:10.1007/jhep06(2018)137

Cited by 11 publications

(6 citation statements)

References 116 publications

(307 reference statements)

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“…While some of the observations in this paper have already been noted in the previous works [12][13][14][15] and the diphoton excess due to the light scalar has also been discussed in several papers [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], the data used are current, leading to new bounds, and we show that the extension of SM by such a scalar can actually give a better fit to the Higgs signal measurement. We begin our discussion with a short review on the radion in the RS model so that this paper can be read as far as possible independently of the preceding literature.…”

Section: Introductionsupporting

confidence: 55%

Discussing 125 GeV and 95 GeV excess in light radion model

Sachdeva

Sadhukhan

2020

Phys. Rev. D

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Even if the LHC observations are consistent with the Standard model (SM), current LHC results are not precise enough to rule out the presence of new physics. Taking a contrarian view of the SM Higgs fandom, we look out for a more suitable candidate for the 125 GeV boson observed at the LHC. At the same time, a recent result from CMS hints toward an excess near 95 GeV in the diphoton (γγ) channel. Given these aspects, we revisit the Higgs-radion mixing model to explore the viability of the radion mixed Higgs to be the 125 GeV boson along with the presence of a light radion (to be precise, Higgs mixed radion) that can show up in future experiments in the γγ channel. We find that the mixed radion-Higgs scenario gives a better fit than the SM, with the radion mixed Higgs as a more suitable 125 GeV scalar candidate. It also gives rise to a diphoton excess from the light radion, consistent with the LHC observations.

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Section: Introductionsupporting

confidence: 55%

Discussing 125 GeV and 95 GeV excess in light radion model

Sachdeva

Sadhukhan

2020

Phys. Rev. D

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“…The combination of the results of the four experiments, ALEPH, DELPHI, L3 and OPAL, led to the presence of a 2.3 σ local excess at an invariant mass of about 95-100 GeV [4]. The agreement between the invariant mass of the excesses observed at LEP and CMS calls for a possible common origin of these two signatures [5][6][7][8][9][10].…”

Section: Searches For Higgs Boson Resonances Produced In Association mentioning

confidence: 99%

A light Higgs at the LHC and the B-anomalies

Liu

Wagner

et al. 2018

J. High Energ. Phys.

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After the Higgs discovery, the LHC has been looking for new resonances, decaying into pairs of Standard Model (SM) particles. Recently, the CMS experiment observed an excess in the di-photon channel, with a di-photon invariant mass of about 96 GeV. This mass range is similar to the one of an excess observed in the search for the associated production of Higgs bosons with the Z neutral gauge boson at LEP, with the Higgs bosons decaying to bottom quark pairs. On the other hand, the LHCb experiment observed a discrepancy with respect to the SM expectations of the ratio of the decay of B-mesons to K-mesons and a pair of leptons,. This observation provides a hint of the violation of lepton-flavor universality in the charged lepton sector and may be explained by the existence of a vector boson originating form a U(1) Lµ−Lτ symmetry and heavy quarks that mix with the left-handed down quarks. Since the coupling to heavy quarks could lead to sizable Higgs di-photon rates in the gluon fusion channel, in this article we propose a common origin of these anomalies identifying a Higgs associated with the breakdown of the U(1) Lµ−Lτ symmetry and at the same time responsible to the quark mixing, with the one observed at the LHC. We also discuss the constraints on the identification of the same Higgs with the one associated with the bottom quark pair excess observed at LEP.

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“…At a similar mass, CMS observes a 2.9 σ local excess in the diphoton channel, that could come from gg → h 2 → γγ [56][57][58]. These observations have motivated theorists to propose a number of models [59][60][61][62][63][64][65][66][67][68] A necessary ingredient of the pNGB DM model is an additional scalar h 2 that mixes with the SM Higgs, denoted as h 1 . It is possible to take m h2 = 96 GeV while still being consistent with the cosmic ray excesses.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

Cline

Toma

2019

Phys. Rev. D

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Persistent excesses in the spectra of gamma rays from the galactic center and cosmic ray antiprotons can be explained by dark matter of mass 50 ∼ 65 GeV annihilating into b quarks, but this is typically hard to reconcile with direct detection constraints. We resolve this tension using a simple class of models, where dark matter is a pseudo-Nambu-Goldstone boson, having naturally momentum-suppressed couplings to nuclei. Exploring the parameter space of the model, we find that it can explain the cosmic ray anomalies while remaining compatible with constraints from the relic abundance and annihilation in dwarf spheroidal galaxies. In certain regions of parameter space, the Higgs-dark matter coupling can help stabilize the Higgs potential up to the Planck scale. The scalar partner of the dark matter is an extra Higgs boson, that can explain a tentative diphoton excess observed by CMS, and an excess of bb signal from LEP, if its mass is ∼ 96 GeV and the model is extended to include a heavy scalar quark. This extended model predicts a monochromatic gamma-ray line near 64 GeV, at a level close to current experimental sensitivity, from dark matter annihilations in the galaxy.

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Light (and darkness) from a light hidden Higgs

Cited by 11 publications

References 116 publications

Discussing 125 GeV and 95 GeV excess in light radion model

Discussing 125 GeV and 95 GeV excess in light radion model

A light Higgs at the LHC and the B-anomalies

Pseudo-Goldstone dark matter confronts cosmic ray and collider anomalies

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