Speaker
Dr
xia wan
(Shaanxi Normal University)
Description
Firstly we define a $CP$ violation phase $\xi$ to quantify the mixture
of $CP$-even and $CP$-odd states for Higgs boson in
new physics beyond Standard Model.
Then we show it explicitly in $H\to\gamma\gamma$, $H\to\gamma\ell\ell$
and $H\to 4\ell$ amplitudes.
The analytical form
gives a good explanation
why the $CP$-violation phase could be observed in $H\to 4\ell$ process but not in $H\to\gamma\gamma$ and $H\to\gamma\ell\ell$ processes.
Meanwhile, to study the relations of amplitudes,
we find a new method of decomposing $H\to\gamma\ell\ell$ and $H\to 4\ell$ amplitudes into $H\to\gamma\gamma$ amplitudes.
For a comparison,
by using the on-shell approach
we study the recursion relations of amplitudes and get a consistent result independently.
| Presentation type | Oral |
|---|
Primary author
Dr
xia wan
(Shaanxi Normal University)
Co-authors
Mr
ke-yao feng
(Shaanxi Normal University)
Dr
you-kai wang
(Shaanxi Normal University)
