A ${\hat{I}}^3{\hat{I}}^3$ Collider for the 750 GeV Resonant State

Abstract

Recent data collected by ATLAS and CMS at 13 TeV collision energy of the LHC indicate the existence of a new resonant state $\ddot{I}•$ with a mass of 750 GeV decaying into two photons ${\hat{I}}^3{\hat{I}}^3$. The properties of $\ddot{I}•$ should be studied further at the LHC and also future colliders. Since only $\ddot{I}•\to {\hat{I}}^3{\hat{I}}^3$ decay channel has been measured, one of the best ways to extract more information about $\ddot{I}•$ is to use a ${\hat{I}}^3{\hat{I}}^3$ collider to produce $\ddot{I}•$ at the resonant energy. In this work we show how a ${\hat{I}}^3{\hat{I}}^3$ collider helps to verify the existence of $\ddot{I}•$ and to provide some of the most important information about the properties of $\ddot{I}•$, such as branching fractions of $\ddot{I}•\to V_1{V}_2$. Here $V_i$ can be ${\hat{I}}^3$, $Z$, or $W^{\pm }$. We also show that by studying angular distributions of the final ${\hat{I}}^3$'s in ${\hat{I}}^3{\hat{I}}^3\to \ddot{I}•\to {\hat{I}}^3{\hat{I}}^3$, one can obtain crucial information about whether this state is a spin-0 or a spin-2 state.

ReTex, 12 page with 6 figures. Expanded discussion on distinguishing spin-0 and spin-2 cases. Several figures added