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oai:recercat.cat:2445/2206342025-12-05T16:12:40Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Measurement of CP asymmetries in D+ (s) → ηπ+ and D+ (s) → η 0π + decays Aaij, R. Alfonso Albero, Alejandro Garcia Moreno, Paula Garrido Beltrán, Lluís Gironella Gironell, Pere Gomez Fernandez, S. Graugés Pous, Eugeni Lobo Salvia, Aniol Marin Benito, Carla Mauricio, J. Vazquez Gomez, Ricardo LHCb collaboration Hadrons Física de partícules Hadrons Particle physics Searches for CP violation in the decays D + (s) → ηπ+ and D + (s) → η 0π + 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 A CP (D+ → ηπ+) = (0.34 ± 0.66 ± 0.16 ± 0.05)%, A CP (D+ s → ηπ+) = (0.32 ± 0.51 ± 0.12)%, A CP (D+ → η 0π +) = (0.49 ± 0.18 ± 0.06 ± 0.05)%, A CP (D+ s → η 0π +) = (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. 2025-04-25T14:10:26Z 2025-04-25T14:10:26Z 2023 2025-04-25T14:10:26Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1126-6708 https://hdl.handle.net/2445/220634 757726 eng Reproducció del document publicat a: https://doi.org/10.1007/JHEP04(2023)081 Journal of High Energy Physics, 2023, vol. 2023, num.81, p. 1-23 https://doi.org/10.1007/JHEP04(2023)081 cc-by (c) Aaij, R. et al., 2023 http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 23 p. application/pdf Springer Verlag Articles publicats en revistes (Física Quàntica i Astrofísica)