Diphoton plus Z production at the ILC at O(alpha(4))

作者：Zhang Yu^*; Guo Lei; Ma Wen Gan; Zhang Ren You; Chen Chong; Li Xiao Zhou

来源：European Physical Journal C, 2014, 74(1): 2739.

DOI：10.1140/epjc/s10052-014-2739-0

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 O(alpha(4)) contributions to the e(+)e(-) -> 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 NLOEW corrections show obviously a non-trivial phase space dependence. We conclude that in studying the signal process e(+)e(-) -> ZH -> Z(gamma gamma), the background process e(+)e(-) -> Z(gamma gamma) can be suppressed significantly if we take appropriate kinematic cuts on the final products.

• 出版日期2014-1-30
• 单位中国科学技术大学