Interpreting the 750 GeV diphoton excess in the minimal dilaton model

Junjie Cao; Liangliang Shang; Wei Su; Yang Zhang; Jinya Zhu

doi:10.1140/epjc/s10052-016-4098-5

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2016) 76: 239
https://doi.org/10.1140/epjc/s10052-016-4098-5

Regular Article - Theoretical Physics

Interpreting the 750 GeV diphoton excess in the minimal dilaton model

Junjie Cao¹^,2, Liangliang Shang², Wei Su³, Yang Zhang³ and Jinya Zhu¹^*

¹ Center for Theoretical Physics, School of Physics and Technology, Wuhan University, Wuhan, 430072, China
² Department of Physics, Henan Normal University, Xinxiang, 453007, China
³ State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing, 100190, China

^* e-mail: zhujy@itp.ac.cn

Received: 8 February 2016
Accepted: 18 April 2016
Published online: 29 April 2016

Abstract

We try to interpret the 750 GeV diphoton excess in the minimal dilaton model, which extends the SM by adding one linearized dilaton field and vector-like fermions. We first show by analytic formulas in this framework that the production rates of the $\gamma \gamma$ , gg, $Z\gamma$ , ZZ, $$WW^*$$ , $t\bar{t}$ , and hh signals at the $750\, \mathrm{GeV}$ resonance are only sensitive to the dilaton–Higgs mixing angle $\theta _S$ and the parameter $\eta \equiv v N_X/f$ , where f is the dilaton decay constant and $$N_X$$ denotes the number of the fermions. Then we scan the two parameters by considering various theoretical and experimental constraints to find the solutions to the diphoton excess. We conclude that the model can predict the central value of the diphoton rate without conflicting with any constraints. The signatures of our explanation at the LHC Run II and the vacuum stability at high energy scale are also discussed.