PoS - Proceedings of Science
Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Quark and Lepton Flavor Physics
CP asymmetries in $D$ decays to two pseudoscalars
U. Nierste,* S. Schacht
*corresponding author
Full text: pdf
Pre-published on: February 06, 2017
Published on: April 19, 2017
Abstract
This talk addresses two topics related to CP asymmetries
in $D$ meson decays to two pseudoscalar mesons. First I discuss
how new physics can be distinguished from the Standard Model
through two sum rules relating three direct CP asymmetries each,
using the sum rule correlating $D^0\to K^+K^-$, $D^0\to \pi^+
\pi^-$, and $D^0\to \pi^0 \pi^0$ for illustration. The other sum
rule involves $a_{CP}^{\mathrm{dir}}(D^+\rightarrow
\bar{K}^0K^+)$, $a_{CP}^{\mathrm{dir}}(D_s^+\rightarrow
K^0\pi^+)$, and $a_{CP}^{\mathrm{dir}}(D_s^+\to K^+ \pi^0)$. The
second topic is the direct CP asymmetry in the decay $D^0 \to K_S
K_S$, which is expected to be large in the Standard Model for two
reasons: Flavor-SU(3) symmetry suppresses the tree amplitude which
enhances the crucial ``penguin-to-tree'' ratio and the ``penguin''
amplitude is dominated by the tree-level $W$ boson exchange
between $c$ and $u$ quarks. We find that $|a_{CP}^{\mathrm{dir}}
(D^0 \to K_S K_S)|$
can be as large as $1.1 \%$ in the Standard Model. We advocate
$D^0 \to K_S K_S$ as a discovery channel for charm CP violation.
DOI: https://doi.org/10.22323/1.282.0527
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.