Measurement of CP asymmetries in D s + → η π + $$ {D}_{(s)}^{+}\to \eta {\pi}^{+} $$ and D s + → η ′ π + $$ {D}_{(s)}^{+}\to {\eta}^{\prime }{\pi}^{+} $$ decays
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Agapopoulou, C.
Aidala, C. A.
Alternative Title
Measurement of CP asymmetries in 𝐷+(𝑠)→𝜂𝜋+ and 𝐷+(𝑠)→𝜂′𝜋+ decays
Date Issued
April 18, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Apr 18;2023(4):81
Version
Final published version
Abstract
Abstract
Searches for CP violation in the decays
D
s
+
→
η
π
+
$$ {D}_{(s)}^{+}\to \eta {\pi}^{+} $$
and
D
s
+
→
η
′
π
+
$$ {D}_{(s)}^{+}\to {\eta}^{\prime }{\pi}^{+} $$
are performed using pp collision data corresponding to 6 fb−1 of integrated luminosity collected by the LHCb experiment. The calibration channels
D
s
+
→
ϕ
π
+
$$ {D}_{(s)}^{+}\to \phi {\pi}^{+} $$
are used to remove production and detection asymmetries. The resulting CP-violating asymmetries are
A
CP
=
D
+
→
η
π
+
=
0.34
±
0.66
±
0.16
±
0.05
%
,
A
CP
=
D
s
+
→
η
π
+
=
0.32
±
0.51
±
0.12
%
,
A
CP
=
D
+
→
η
′
π
+
=
0.49
±
0.18
±
0.06
±
0.05
%
,
A
CP
=
D
s
+
→
η
′
π
+
=
0.01
±
0.12
±
0.08
%
,
$$ {\displaystyle \begin{array}{l}{\mathcal{A}}^{CP}=\left({D}^{+}\to \eta {\pi}^{+}\right)=\left(0.34\pm 0.66\pm 0.16\pm 0.05\right)\%,\\ {}{\mathcal{A}}^{CP}=\left({D}_s^{+}\to \eta {\pi}^{+}\right)=\left(0.32\pm 0.51\pm 0.12\right)\%,\\ {}\begin{array}{l}{\mathcal{A}}^{CP}=\left({D}^{+}\to {\eta}^{\prime }{\pi}^{+}\right)=\left(0.49\pm 0.18\pm 0.06\pm 0.05\right)\%,\\ {}{\mathcal{A}}^{CP}=\left({D}_s^{+}\to {\eta}^{\prime }{\pi}^{+}\right)=\left(0.01\pm 0.12\pm 0.08\right)\%,\end{array}\end{array}} $$
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
CP
=
D
+
→
ϕ
π
+
$$ {\mathcal{A}}^{CP}=\left({D}^{+}\to \phi {\pi}^{+}\right) $$
. These measurements, currently the most precise for three of the four channels considered, are consistent with the absence of CP violation. A combination of these results with previous LHCb measurements is presented.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP04(2023)081
