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Measurement of CP asymmetries in Λ0b → ph− decays

A search for 𝐶⁢𝑃 violation in Λ0𝑏 →𝑝⁢𝐾− and Λ0𝑏 →𝑝⁢𝜋− decays is presented using the full Run 1 and Run 2 data samples of 𝑝⁢𝑝 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...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Dittmann, Lucas (Author) , Esen, Sevda (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 8 May, 2025
In: Physical review
Year: 2025, Volume: 111, Issue: 9, Pages: 1-15
ISSN:2470-0029
DOI:10.1103/PhysRevD.111.092004
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.111.092004
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.111.092004
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:A search for 𝐶⁢𝑃 violation in Λ0𝑏 →𝑝⁢𝐾− and Λ0𝑏 →𝑝⁢𝜋− decays is presented using the full Run 1 and Run 2 data samples of 𝑝⁢𝑝 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 𝐶⁢𝑃-violating asymmetries are measured to be 𝐴𝑝⁢𝐾−𝐶⁢𝑃 =(−1.4 ±0.7 ±0.4)% and 𝐴𝑝⁢𝜋−𝐶⁢𝑃 =(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 𝐴𝑝⁢𝐾−𝐶⁢𝑃 =(−1.1 ±0.7 ±0.4)% and 𝐴𝑝⁢𝜋−𝐶⁢𝑃 =(0.2 ±0.8 ±0.4)%, constituting the most precise measurements of these asymmetries to date.
Item Description:Im Text ist "0" und "-" hochgestellt, "b" ist tiefgestellt
LHCb Collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C. Cocha Toapaxi, M. De Cian, L. Dittmann, S. Esen, F.C. Glaser, P. A. Günther, X. Han, S. Hansmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov [und viele weitere]
Gesehen am 04.12.2025
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.111.092004

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