2021/05/14 by Aoki, Y., Fujii, K., Tian, J.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2105.06665
We studied the e+e- → h γ process at the International Linear Collider (ILC) at √(s)=250 GeV, based on the full detector simulation of the International Large Detector (ILD). This process is loop-induced in the Standard Model (SM) and is sensitive to new physics which alters h γγ or h γZ coupling. We performed the analysis by employing the leading signal channels with h → b b and h → WW^* and including full SM background processes. The results are obtained for two scenarios of beam polarisations each with an integrated luminosity of 900 fb-1. We found the expected significance of the SM signal is 0.40σ for P(e-,e+)=(-0.8,+0.3) (the left-handed polarisation), and 0.06σ for P(e-,e+)=(+0.8,-0.3) (the right-handed polarisation). The bounds on new physics effects are reported as the 95% C.L. upper limit for the cross-section of e+e- → h γ: σhγL