Diphoton plus production at the ILC at

Zhang Yu; Guo Lei; Ma Wen-Gan; Zhang Ren-You; Chen Chong; Li Xiao-Zhou

doi:10.1140/epjc/s10052-014-2739-0

EPJ

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2014) 74: 2739
https://doi.org/10.1140/epjc/s10052-014-2739-0

Regular Article - Theoretical Physics

Diphoton plus production at the ILC at $\mathcal{O}(\alpha ^4)$

Zhang Yu, Guo Lei^*, Ma Wen-Gan, Zhang Ren-You, Chen Chong and Li Xiao-Zhou

Department of Modern Physics, University of Science and Technology of China (USTC), Hefei, 230026, Anhui, People’s Republic of China

^* e-mail: guolei@mail.ustc.edu.cn

Received: 1 December 2013
Accepted: 8 January 2014
Published online: 30 January 2014

Abstract

A precision measurement for the production of a $$Z$$ -boson in association with two photons is important for investigating the Higgs boson and exploring new physics at the International Linear Collider. It could be used to study the $ZZ\gamma \gamma$ anomalous quartic gauge coupling. In this work we report on our calculation of the full $\mathcal{O} (\alpha ^4)$ contributions to the $e^+e^- \rightarrow Z \gamma \gamma ~$ process in the standard model, and we analyze the electroweak (EW) quantum effect on the total cross section. We investigate the dependence of the $Z\gamma \gamma$ production rate on the event selection scheme and provide distributions for some important kinematic observables. We find that the next-to-leading order (NLO) EW corrections can enhance the total cross section quantitatively from 2.32 to $9.61\,\%$ when the colliding energy goes up from $$250$$ GeV to $$1$$ TeV, and the NLO EW corrections show obviously a nontrivial phase space dependence. We conclude that in studying the signal process $e^+e^- \rightarrow ZH \rightarrow Z \gamma \gamma ~$ , the background process $e^+e^- \rightarrow Z \gamma \gamma ~$ can be suppressed significantly if we take appropriate kinematic cuts on the final products.