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Amplitude analysis of the Λc+→pKπ+ decay and Λc+ baryon polarization measurement in semileptonic beauty hadron decays

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Schmelling,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.       
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

LHCb Collaboration, Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., et al. (2023). Amplitude analysis of the Λc+→pKπ+ decay and Λc+ baryon polarization measurement in semileptonic beauty hadron decays. Physical Review D, 108(1): 012023. doi:10.1103/PhysRevD.108.012023.


Cite as: https://hdl.handle.net/21.11116/0000-000D-D822-9
Abstract
An amplitude analysis of Λc+→pKπ+ decays together with a measurement of the Λc+ polarization vector in semiōleptonic beauty hadron decays is presented. A sample of 400 000 candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. The mass and width of the Λ(2000) state are also determined. A significant Λc+ polarization is found. A large sensitivity of the Λc+→pKπ+ decay to the polarization is seen, making the amplitude model suitable for Λc+ polarization measurements in other systems.