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arXiv · 1512.08497

A Promising Interpretation of Diphoton Resonance at 750 GeV

Xiao-Jun Bi·Ran Ding·Yizhou Fan·Li Huang·Chuang Li·Tianjun Li·Shabbar Raza·Xiao-Chuan Wang·Bin Zhu
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Abstract

Recently, an excess of events in diphoton channel with invariant mass of about 750 GeV has been reported by the ATLAS and CMS Collaborations. Considering it as a tantalizing hint for new physics beyond the Standard Model (SM), we propose a simple extension of the SM with an additional doublet Higgs $H^{'}$ and a singlet $s$. We consider the neutral component $H^{\prime }_0$ of $H'$ as the 750 GeV resonance, and assume that $s$ is lighter than 2.6 GeV. In particular, $H^{\prime }_0$ can be produced at tree level via $q{\bar q}$ production, and decay into a pair of $s$ at tree level. And then $s$ can decay into a pair of collimated photons, which cannot be distinguished at the LHC. We show that the diphoton production cross section can be from 3 to 13 ${\rm fb}$, the decay width of $H^{\prime }_0$ can be from 30 to 60 GeV, and all the current experimental constraints including dijet constraint can be satisfied.

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Xiao-Jun Bi, Ran Ding, Yizhou Fan, Li Huang, Chuang Li, Tianjun Li, Shabbar Raza, Xiao-Chuan Wang, Bin Zhu. 2015-12-28. A Promising Interpretation of Diphoton Resonance at 750 GeV. https://doi.org/10.1103/physrevd.94.015012

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