KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2018 winter) and 3rd KIAS-NCTS-KEK workshop on Particle Physics Phenomenology

Direct measurement of the trilinear Higgs self-coupling in e+e−→ZH.

6 Dec 2018, 16:45

15m

Seminar Hall, Building 3 (KEK)

Parallel Session 1

Speaker

Junya Nakamura (Universität Tübingen)

Description

A method to measure "directly" the trilinear Higgs self-coupling $\lambda$ in a single Higgs production process is proposed. Time-reversal-odd (T-odd) quantities in the process $e^{+}{e}^{-}\to ZH$, $Z\to f\overline{f}$ are computed from the absorptive part of the electroweak one-loop amplitude. They are essentially up-down asymmetries of the final fermion $f$ with respect to the $ZH$ production plane. The T-odd asymmetries directly measure $\lambda$, because the tree-level diagram for a final-state interaction between the $ZH$ contributes linearly to them.

Presentation materials

Slides

KEKPH2018-JN.pdf