A 750 GeV diphoton signal from a very light pseudoscalar in the NMSSM

Ellwanger, Ulrich; Hugonie, Cyril

doi:10.1007/jhep05(2016)114

Cited by 34 publications

(21 citation statements)

References 128 publications

(210 reference statements)

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“…This mixing effect has already been noted in the context of heavy quarkonia [16,27] and its impact on A 1 -decays at the bb-threshold was highlighted in [56]. In the very low-mass range, [57] suggested that the hadronic decays of A 1 may resemble those of the meson that is closest in mass, while [58] estimated the mixing with the mesons in the formalism of Partially-Conserved Axial Currents (PCAC). As a consequence of this confused situation for the pseudoscalar decays, the phenomenology of this particle at low-mass remains largely speculative and the interplay of constraints cannot be consistently applied.…”

Section: Jhep03(2017)052mentioning

confidence: 74%

Decays of a NMSSM CP-odd Higgs in the low-mass region

Domingo

2017

J. High Energ. Phys.

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A popular regime in the NMSSM parameter space involves a light CP-odd Higgs A 1 . This scenario has consequences for e.g. light singlino Dark Matter annihilating in the A 1 -funnel. In order to confront the pseudoscalar to experimental limits such as flavour observables, Upsilon decays or Beam-Dump experiments, it is necessary to control the interactions of this particle with hadronic matter and derive the corresponding decays. The partonic description cannot be relied upon for masses close to m A 1 ∼ 1 GeV and we employ a chiral lagrangian, then extended to a spectator model for somewhat larger masses, to describe the interplay of the CP-odd Higgs with hadrons. Interestingly, a mixing can develop between A 1 and neutral pseudoscalar mesons, leading to substantial hadronic decays and a coupling of A 1 to the chiral anomaly. Additionally, quartic A 1 -meson couplings induce tri-meson decays of the Higgs pseudoscalar. We investigate these effects and propose an estimate of the Higgs widths for masses below m A 1 3 GeV. While we focus on the case of the NMSSM, our results are applicable to a large class of models.

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Section: Jhep03(2017)052mentioning

confidence: 74%

Decays of a NMSSM CP-odd Higgs in the low-mass region

Domingo

2017

J. High Energ. Phys.

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“…2.1.2. In the NMSSM one can explain this excess by assuming the presence of additional final states via four-body decays like → (φ a )(φ a ) → 4γ γ [173,183]. This explanation requires the mass of φ a to be tiny and very close to the pion mass.…”

Section: Sarahmentioning

confidence: 99%

Precision tools and models to narrow in on the 750 GeV diphoton resonance

et al. 2016

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The hints for a new resonance at 750 GeV from ATLAS and CMS have triggered a significant amount of attention. Since the simplest extensions of the standard model cannot accommodate the observation, many alternatives have been considered to explain the excess. Here we focus on several proposed renormalisable weakly-coupled models and revisit results given in the literature. We point out that physically important subtleties are often missed or neglected. To facilitate the study of the excess we have created a collection of 40 model files, selected from recent literature, for the Mathematica package SARAH. With SARAH one can generate files to perform numerical studies using the tailormade spectrum generators FlexibleSUSY and SPheno. These have been extended to automatically include crucial higher order corrections to the diphoton and digluon decay rates for both CP-even and CP-odd scalars. Additionally, we have extended the UFO and CalcHep interfaces of SARAH, a

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“…If the invisible decay mode of the resonance, which is less constrained, is responsible for a large width of the resonance, there is an interesting possibility that the resonance plays a role of mediator between the SM and dark matter [30,[37][38][39][40][41][42][43][44][45][46][47][48][49]. On the other hand, there is a plausible option to explain the diphoton excesses with collimated photons, the so called photon-jets, which come from a cascade decay of the resonance into a pair of light mediators, each of them decaying into a pair of photons [50][51][52][53][54][55][56][57]. In this case, the width of the resonance can be increased by a renormalizable coupling between the resonance and the light mediator.…”

Section: Jhep07(2016)030mentioning

confidence: 99%

Diphoton resonance confronts dark matter

Choi

Kang

Lee

2016

J. High Energ. Phys.

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As an interpretation of the 750 GeV diphoton excesses recently reported by both ATLAS and CMS collaborations, we consider a simple extension of the Standard Model with a Dirac fermion dark matter where a singlet complex scalar field mediates between dark matter and SM particles via effective couplings to SM gauge bosons and/or Higgs-portal. In this model, we can accommodate the diphoton events through the direct and/or cascade decays of pseudo-scalar and real scalar partners of the complex scalar field. We show that mono-jet searches and gamma-ray observations are complementary in constraining the region where the width of the diphoton resonance can be enhanced due to the couplings of the resonance to dark matter and the correct relic density is obtained. In the case of cascade decay of the resonance, the effective couplings of singlet scalars can be smaller, but the model is still testable by the future discrimination between single photon and photon-jet at the LHC as well as the gamma-ray searches for the cascade annihilation of dark matter.

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A 750 GeV diphoton signal from a very light pseudoscalar in the NMSSM

Cited by 34 publications

References 128 publications

Decays of a NMSSM CP-odd Higgs in the low-mass region

Decays of a NMSSM CP-odd Higgs in the low-mass region

Precision tools and models to narrow in on the 750 GeV diphoton resonance

Diphoton resonance confronts dark matter

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