Amplitude Analysis of the Λc+ → p K− π+ Decay and Λc+ Baryon Polarization Measurement in Semileptonic Beauty Hadron Decays

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doi:10.1103/PhysRevD.108.012023

An amplitude analysis of Λc+ → p K− π+ decays together with a measurement of the Λc+ polarization vector in semileptonic 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+ → p K− π+ decay to the polarization is seen, making the amplitude model suitable for Λc+ polarization measurements in other systems.

Aaij, R., Abdelmotteleb, A., Beteta, C.A., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Amplitude Analysis of the Λc+ → p K− π+ Decay and Λc+ Baryon Polarization Measurement in Semileptonic Beauty Hadron Decays. PHYSICAL REVIEW D, 108(1), 1-27 [10.1103/PhysRevD.108.012023].