A composite model for the 750 GeV diphoton excess

By K. Harigaya, Y. Nomura. 2015

156 citations recorded by the source corpus.

A bstractWe study a simple model in which the recently reported 750 GeV diphoton excess arises from a composite pseudo Nambu-Goldstone boson — hidden pion — produced by gluon fusion and decaying into two photons. The model only introduces an extra hidden gauge group at the TeV scale with a vectorlike quark in the bifundamental representation of the hidden and standard model gauge groups. We calculate the masses of all the hidden pions and analyze their experimental signatures and constraints. We find that two colored hidden pions must be near the current experimental limits, and hence are probed in the near future. We study physics of would-be stable particles — the composite states that do not decay purely by the hidden and standard model gauge dynamics — in detail, including constraints from cosmology. We discuss possible theoretical structures above the TeV scale, e.g. conformal dynamics and supersymmetry, and their phenomenological implications. We also discuss an extension of the minimal model in which there is an extra hidden quark that is singlet under the standard model and has a mass smaller than the hidden dynamical scale. This provides two standard model singlet hidden pions that can both be viewed as diphoton/diboson resonances produced by gluon fusion. We discuss several scenarios in which these (and other) resonances can be used to explain various excesses seen in the LHC data.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ec37b7a19b217f870569f77b0e9e61ddae86df69

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

1. Lian-tao Wang
2. M. Low
3. Andrea Tesi
4. Cms Collaboration
5. G. Salam
6. A. Larkoski
7. Jesse Thaler
8. A. Wulzer

Citations in the corpus

• A pseudoscalar decaying to photon pairs in the early LHC Run 2 data (2015, background): “These studies have looked at the effective theory for a spin-0 resonance [3–5], the effective theory including an additional field for dark matter [6, 7], adding vector-like quarks to enhance the interactions of the resonance with photons and gluons [8, 9], adding a confining sector that is vector-l”