An amplitude analysis of Λ + c → p K − π + decays together with a measurement of the Λ + c 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 Λ + c polarization is found. A large sensitivity of the Λ + c → p K − π + decay to the polarization is seen, making the amplitude model suitable for Λ + c polarization measurements in other systems.
Amplitude analysis of the Λc+→pK−π+ decay and Λc+ baryon polarization measurement in semileptonic beauty hadron decays
Brundu, D.;Dettori, F.;Litvinov, R.;Manca, G.;Oldeman, R.;Saitta, B.;Sun, J.;
2023-01-01
Abstract
An amplitude analysis of Λ + c → p K − π + decays together with a measurement of the Λ + c 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 Λ + c polarization is found. A large sensitivity of the Λ + c → p K − π + decay to the polarization is seen, making the amplitude model suitable for Λ + c polarization measurements in other systems.File | Dimensione | Formato | |
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