The QCD axion from aligned axions and diphoton excess

Higaki, Tetsutaro; Jeong, Kwang Sik; Kitajima, Naoya; Takahashi, Fuminobu

doi:10.1016/j.physletb.2016.01.055

Cited by 140 publications

(77 citation statements)

References 52 publications

(76 reference statements)

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“…[14][15][16][17][18][19][20][21][22][23][24][25], an analogous coupling to gluons would be generated which would dominate the photon coupling by about an order of magnitude, and photon fusion would be subdominant. Hence an unavoidable consequence of a photon-fusion induced resonance would be the presence of uncolored new particles [26].…”

Section: Uv Completions a General Considerationsmentioning

confidence: 99%

Scattering light by light at 750 GeV at the LHC

2016

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We consider the possibility that the diphoton excess at 750 GeV is caused by a new scalar resonance produced in photon fusion. This scenario is parametrized by only one relevant effective couplings and is thus minimal. We show that this setup can reproduce both the production rate and width of the resonance, and is not in conflict with the 8 TeV limits on the diphoton cross section. The scenario also predicts event rates for WW, ZZ, Zγ final states. We suggest for one to perform precision measurements by studying lightby-light scattering with intact protons detected in forward detectors. We construct a simple model that shows that the required couplings can be achieved with new vectorlike, uncolored fermions (with a strong Yukawa coupling to the resonance) which may also account for the required width.

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Section: Uv Completions a General Considerationsmentioning

confidence: 99%

Scattering light by light at 750 GeV at the LHC

2016

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“…Recently, four of the present authors (TH, KSJ, NK, and FT) applied the alignment mechanism to the QCD axion, and studied its cosmological and phenomenological implications [35,36]. In this model, the QCD axion is given by a flat direction composed of multiple axions.…”

Section: Jhep08(2016)044mentioning

confidence: 99%

“…[35]. The following discussion, however, can be straightforwardly applied to more general aligned axion models.…”

Section: Jhep08(2016)044mentioning

confidence: 99%

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Topological defects and nano-Hz gravitational waves in aligned axion models

Higaki

Jeong

Kitajima

et al. 2016

J. High Energ. Phys.

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We study the formation and evolution of topological defects in an aligned axion model with multiple Peccei-Quinn scalars, where the QCD axion is realized by a certain combination of the axions with decay constants much smaller than the conventional PecceiQuinn breaking scale. When the underlying U(1) symmetries are spontaneously broken, the aligned structure in the axion field space exhibits itself as a complicated string-wall network in the real space. We find that the string-wall network likely survives until the QCD phase transition if the number of the Peccei-Quinn scalars is greater than two. The stringwall system collapses during the QCD phase transition, producing a significant amount of gravitational waves in the nano-Hz range at present. The typical decay constant is constrained to be below O(100) TeV by the pulsar timing observations, and the constraint will be improved by a factor of 2 in the future SKA observations.

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“…In supersymmetry, the scalar partner of the goldstino could provide an explanation to the diphoton signal [97,147,167,335]. Other ideas, slightly more exotic, include: a model with a space-time varying electromagnetic coupling constant [135], Gluinonia [337], Squarkonium/Diquarkonium [299], flavons [244], axions in various incarnations [8,24,63,246,274,336], a natural Coleman-Weinberg theory [22,307], radiative neutrino mass models [264,325,327], and string-inspired models [19,132,188,240,254].…”

Section: Modelsmentioning

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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The QCD axion from aligned axions and diphoton excess

Cited by 140 publications

References 52 publications

Scattering light by light at 750 GeV at the LHC

Scattering light by light at 750 GeV at the LHC

Topological defects and nano-Hz gravitational waves in aligned axion models

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

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