Speaker
Description
In the Standard Model（SM）, ΗγZ coupling is a loop induced coupling, therefore it might receive relatively large correction from Beyond Standard Model（BSM） physics. It is very challenging to measure at the HL-LHC, where only 3σ significance is expected for branching ratio of H$\to$γZ. On the other hand, HγZ coupling is potentially very sensitive to new physics, for example some new heavy particles contributing to the loop, therefore it is interesting to know how well this coupling can be measured at the International Linear Collider (ILC). More over, it is found HγZ coupling plays an important role in a framework of effective field theory, for example in $e^+e^-\to$ ZH process it is necessary to know the contribution from s-channel with photon. It turns out that the anomalous HγZ, Hγγ, HZZ and HWW couplings come from a few common set of dimension-6 operators, and HγZ coupling measurement can provide very useful constraints on those operators.
In this talk, we will report the study of HγZ coupling using production channel $e^+e^-\to$ γH, with preliminary results based on the full simulation of ILD using the multivariate data analysis. Results will be given for an integrated luminosity of 2000 $fb^{-1}$(final plan) at $E_{CM}$=250 GeV.
| Time Zone | Asia/Pacific |
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