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

MPS-Authors
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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2023). Measurement of CP asymmetries in D(s)+ → ηπ+ and D(s)+ → η′π+ decays. Journal of high energy physics: JHEP, 2023(4): 81. doi:10.1007/JHEP04(2023)081.


Cite as: https://hdl.handle.net/21.11116/0000-000D-F7BC-9
Abstract
Searches for CP violation in the decays D(s)+ → ηπ+ and D(s)+ → 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)+→ φπ+ are used to remove production and detection asymmetries. The resulting CP-violating asymmetries are

ACP (D+ → ηπ+) = (0.34 ± 0.66 ± 0.16 ± 0.05)%,
ACP (Ds+ → ηπ+) = (0.32 ± 0.51 ± 0.12)%,
ACP (D+ → η′π+) = (0.49 ± 0.18 ± 0.06 ± 0.05)%,
ACP (Ds+ → η′π+) = (0.01 ± 0.12 ± 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 ACP (D+ → φπ+). 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.