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.
2025
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-02/A - Fisica teorica delle interazioni fondamentali, modelli, metodi matematici e applicazioni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/163106
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