A search for CP violation in Λ0b → pK− and Λ0b → pπ− decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CPviolating asymmetries are measured to be ApK−CP ¼ ð−1.4 0.7 0.4Þ% and Apπ−CP ¼ ð0.4 0.9 0.4Þ%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ApK−CP ¼ ð−1.1 0.7 0.4Þ% and Apπ−CP ¼ ð0.2 0.8 0.4Þ%, constituting the most precise measurements of these asymmetries to date.
Measurement of CP asymmetries in Λ0b → ph − decays
Bassi G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;
2025
Abstract
A search for CP violation in Λ0b → pK− and Λ0b → pπ− decays is presented using the full Run 1 and Run 2 data samples of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1 at center-of-mass energies of 7, 8, and 13 TeV. For the Run 2 data sample, the CPviolating asymmetries are measured to be ApK−CP ¼ ð−1.4 0.7 0.4Þ% and Apπ−CP ¼ ð0.4 0.9 0.4Þ%, where the first uncertainty is statistical and the second is systematic. Following significant improvements in the evaluation of systematic uncertainties compared to the previous LHCb measurement, the Run 1 dataset is reanalyzed to update the corresponding results. When combining the Run 2 and updated Run 1 measurements, the final results are found to be ApK−CP ¼ ð−1.1 0.7 0.4Þ% and Apπ−CP ¼ ð0.2 0.8 0.4Þ%, constituting the most precise measurements of these asymmetries to date.| File | Dimensione | Formato | |
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PhysRevD.111.092004.pdf
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