# ALPS2020 -- Fifth Alpine LHC Physics Summit

13-18 April 2020
UZ Obergurgl
Europe/Zurich timezone

## Measurement of charm-mixing parameter y_CP in D0 → KSω decays at Belle

Not scheduled
20m
UZ Obergurgl

#### UZ Obergurgl

University Center Obergurgl Gaisbergweg 5 6456 Obergurgl Austria

### Speaker

Dr Minakshi Nayak (Tel Aviv University)

### Description

Within the Standard Model, $CP$-violation in the charm system is very small, making it a good probe for new physics. The observable $y_{CP}$ parameterizes charm-mixing in $D^0$ decays to $CP$-eigenstates and is sensitive to $CP$-violation in the charm system. The current world average value of $y_{CP}$ is $(0.715\pm 0.111)\%$, where the precision mostly comes from $CP$-even decays of $D^0$. It includes a measurement from $CP$-odd final state, $K^{0}_{S}\phi$, in an analysis that assumes no $CP$-violation. I will present the first measurement of $y_{CP}$ in the $CP$-odd decay $D^{0}\to K^{0}_{S}\omega$, allowing for $CP$-violation, using the full Belle dataset. I would also discuss the Belle II prospects of $y_{CP}$ from $CP$-odd decays.

### Primary authors

Dr Minakshi Nayak (Tel Aviv University) Prof. David Cinabro (Wayne State University)

### Presentation Materials

There are no materials yet.