PoS - Proceedings of Science
Volume 291 - 9th International Workshop on the CKM Unitarity Triangle (CKM2016) - Parallel WG7
Measurements of mixing and indirect $CP$ violation in two-body charm decays at LHCb
K. Maguire* on behalf of the LHCb collaboration
*corresponding author
Full text: pdf
Pre-published on: June 05, 2017
Published on: June 13, 2017
Abstract
The large dataset of charm decays collected by $\mbox{LHCb}$ in the first data-taking period ($\text{Run}~1$) of the Large Hadron Collider ($\mbox{LHC}$), facilitates precision measurements of charm mixing and of the Charge-Parity (${CP}$) symmetry. Of particular interest are two-body decays due to their large branching fractions and the abundance of Cabibbo favoured (CF) control modes, suppressed modes and ${CP}$ eigenstates. The observable $A_{\Gamma}$, which is predominantly a measure of indirect ${CP}$ violation, is accessed through the singly Cabibbo suppressed decays $\mathrm{D}^{0} \rightarrow \mathrm{K}^{+} \mathrm{K}^{-}$ and $\mathrm{D}^{0} \rightarrow \pi^{+} \pi^{-}$. The results are $A_{\Gamma}(\mathrm{K}^{+} \mathrm{K}^{-}) = (-0.30 \pm 0.32 \pm 0.10)\times 10^{-3}$ and $A_{\Gamma}(\pi^{+} \pi^{-}) = (0.46 \pm 0.58 \pm 0.12)\times 10^{-3}$, where the first uncertainty is statistical, and the second systematic. These measurements show no evidence of ${CP}$ violation and improve on the precision of the previous best measurements by nearly a factor of two. The interference between possible decay mechanisms of the doubly Cabibbo suppressed (DCS) $\mathrm{D}^{0} \rightarrow \mathrm{K}^{+}\pi^{-}$ and ${\kern 0.2em\overline{\kern -0.2em \mathrm{D}}{}}{}^{0} \rightarrow \mathrm{K}^{-}\pi^{+}$ decays gives access to the charm system mixing parameters and provides a test of various ${CP}$ violation hypotheses. The results are consistent with the no ${CP}$ violation hypothesis.
DOI: https://doi.org/10.22323/1.291.0140
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.