Symmetries Behind the 750 GeV Diphoton Excess
Abstract
A 750 GeV resonance has been observed at the Run 2 LHC in the diphoton channel. In this paper, we explain this resonance as a CP-even scalar, S, that triggers the spontaneous breaking of local or gauge symmetries. S couples to gluon and photon pairs at the one-loop level, where particles running in the loop are originally introduced to cancel anomalies. The gluon fusion is the dominate production channel of S at the LHC. The model automatically contains a scalar dark matter candidate, stabilized by the new gauge symmetry. Our study shows that both the observed production cross section at the LHC and the best fit decay width of S can be explained in this concrete model, without conflicting with any experimental data. Constraints on couplings of S are studied, which shows a negligible mixing with the standard model Higgs boson but sizable coupling with the dark matter.
Keywords
Cite
@article{arxiv.1512.06297,
title = {Symmetries Behind the 750 GeV Diphoton Excess},
author = {Wei Chao},
journal= {arXiv preprint arXiv:1512.06297},
year = {2016}
}
Comments
16 pages, 4 figures, 1 table, more references added, typos corrected, accepted for publication in Phys. Rev. D