A search for CP violation in Λ0b → p K− and Λ0b → p π− 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 CP-violating asymmetries are measured to be A_CP^pK− = (−1.4 ± 0.7 ± 0.4)% and A_CP^pπ− = (0.4 ± 0.9 ± 0.4)%, 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 A_CP^pK− = (−1.1 ± 0.7 ± 0.4)% and A_CP^pπ− = (0.2 ± 0.8 ± 0.4)%, constituting the most precise measurements of these asymmetries to date.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Measurement of CP asymmetries in Λ0b → p h− decays. PHYSICAL REVIEW D, 111(9), 1-15 [10.1103/physrevd.111.092004].

Measurement of CP asymmetries in Λ0b → p h− decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

A search for CP violation in Λ0b → p K− and Λ0b → p π− 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 CP-violating asymmetries are measured to be A_CP^pK− = (−1.4 ± 0.7 ± 0.4)% and A_CP^pπ− = (0.4 ± 0.9 ± 0.4)%, 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 A_CP^pK− = (−1.1 ± 0.7 ± 0.4)% and A_CP^pπ− = (0.2 ± 0.8 ± 0.4)%, constituting the most precise measurements of these asymmetries to date.
2025
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Measurement of CP asymmetries in Λ0b → p h− decays. PHYSICAL REVIEW D, 111(9), 1-15 [10.1103/physrevd.111.092004].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1034973
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