21-25 May 2018
Budker INP
Asia/Novosibirsk timezone

D mixing parameter y in the factorization-assisted topological-amplitude approach

25 May 2018, 12:45
20m
Budker INP

Budker INP

Lavrentiev av. 11, Novosibirsk 630090

Speaker

Dr Qin Qin (University of Siegen)

Description

We calculate the $D^0-\overline{D}^0$ mixing parameter $y$ in the factorization-assisted topological-amplitude (FAT) approach, considering contributions from $D^{0}\to PP$, $PV$, and $VV$ modes, where $P$ ($V$) stands for a pseudoscalar (vector) meson. The $D^{0}\to PP$ and $PV$ decay amplitudes are extracted in the FAT approach, and the $D^{0}\to VV$ ones with final states in the longitudinal polarization are estimated via the parameter set for $D^{0}\to PV$. It is found that the $VV$ contribution to $y$, being of order of $10^{-4}$, is negligible, and that the $PP$ and $PV$ contributions amount only up to $y_{PP+PV}=(0.21\pm0.07)\%$, a prediction more precise than those obtained in the literature, and much lower than the experimental data $y_{\rm exp}=(0.61\pm0.08)\%$. We conclude that $D^{0}$ meson decays into other two-body and multi-particle final states are relevant to the evaluation of $y$, so it is difficult to have its full understanding in an exclusive approach.

Primary author

Dr Qin Qin (University of Siegen)

Presentation Materials