Measurement of $CP$ asymmetries in $D^+_{(s)}\rightarrow ηπ^+$ and $D^+_{(s)}\rightarrow η^{\prime} π^+$ decays

LHCb Collaboration

doi:10.1007/JHEP04(2023)081

paper

Measurement of $C P$ asymmetries in $D_{(s)}^{+} \to η π^{+}$ and $D_{(s)}^{+} \to η^{'} π^{+}$ decays

arXiv:2204.12228 · doi:10.1007/JHEP04(2023)081

Abstract

Searches for $C P$ violation in the decays $D_{(s)}^{+} \to η π^{+}$ and $D_{(s)}^{+} \to η^{'} π^{+}$ are performed using $pp$ collision data corresponding to 6 fb $^{- 1}$ of integrated luminosity collected by the LHCb experiment. The calibration channels $D_{(s)}^{+} \to ϕ π^{+}$ are used to remove production and detection asymmetries. The resulting $C P$ -violating asymmetries are $A^{C P} (D^{+} \to η π^{+}) = (0.34 \pm 0.66 \pm 0.16 \pm 0.05) %$ , $A^{C P} (D_{s}^{+} \to η π^{+}) = (0.32 \pm 0.51 \pm 0.12) %$ , $A^{C P} (D^{+} \to η^{'} π^{+}) = (0.49 \pm 0.18 \pm 0.06 \pm 0.05) %$ , $A^{C P} (D_{s}^{+} \to η^{'} π^{+}) = (0.01 \pm 0.12 \pm 0.08) %$ , where the first uncertainty is statistical, the second is systematic and the third, relevant for the $D^{+}$ channels, is due to the uncertainty on $A^{C P} (D^{+} \to ϕ π^{+})$ . These measurements, currently the most precise for three of the four channels considered, are consistent with the absence of $C P$ violation. A combination of these results with previous LHCb measurements is presented.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-051.html (LHCb public pages)

Measurement of CP asymmetries in D(s)+​→ηπ+ and D(s)+​→η′π+ decays

Abstract

References in corpus (19)

Measurement of $C P$ asymmetries in $D_{(s)}^{+} \to η π^{+}$ and $D_{(s)}^{+} \to η^{'} π^{+}$ decays