International Workshop on Future Linear Colliders, LCWS2024

Determination of CP-violating Higgs couplings with transversely-polarized beams at the ILC

9 Jul 2024, 09:30

20m

Ito Hall (Ito International Research Center)

Oral presentation (remote) Higgs, Electro-Weak Higgs, Electroweak

Speaker

Dr Cheng Li (Sun-Yat-Sen University)

Description

We study possible CP-violation effects of the Higgs to $Z$-boson coupling
at a future $e^{+}{e}^{-}$ collider, e.g. the International Linear Collider (ILC). We find that the azimuthal angular distribution of the muon pair, produced by $e^{+}{e}^{-}\to HZ->H{\mu }^{+}{\mu }^{-}$, can be sensitive to such a CP-violation effect when we apply initial transversely polarized beams. Based on this angular distribution, we construct a CP sensitive asymmetry and obtain this asymmetry by Whizard simulation. By comparing the SM prediction with 2$\sigma$ range of this asymmetry, we estimate the limit of the CP-odd coupling in $HZZ$ interaction, including as well studies from unpolarized and longitudinally-polarized beams.

Presentation materials

LCWS_chengli.pdf

Peer reviewing

Paper

Accepted on 3 Dec 2024 by Junping Tian

lcws_cppol.pdf