Note on Spin-2 Particle Interpretation of the 750~GeV Diphoton Excess
Abstract
We explore the possibility to explain the 750 GeV diphoton excess recently measured by ATLAS and CMS collaborations in terms of a massive spin-2 particle. In particular, we consider the case in which the top-quark loops can give the similar amplitudes as the tree-level contributions to the diphoton and digluon channels. Such a scenario can be naturally realized in the generalized warped extra dimension models. As a result, the parameter space favored by the diphoton data implies that the top-quark loop contribution can compete to and even dominate over the tree-level amplitude in the spin-2 particle production via the gluon-gluon fusion process. Similar results are obtained for the case in which the spin-2 particle induces large invisible decay branching ratios, as indicated by the ATLAS data.
Keywords
Cite
@article{arxiv.1601.07385,
title = {Note on Spin-2 Particle Interpretation of the 750~GeV Diphoton Excess},
author = {Chao-Qiang Geng and Da Huang},
journal= {arXiv preprint arXiv:1601.07385},
year = {2016}
}
Comments
22 pages, 9 figures, revised version accepted by PRD