Study of the D0p amplitude in Λ0b→D0pπ− decays

Abstract : An amplitude analysis of the decay Λ0b→D0pπ− is performed in the part of the phase space containing resonances in the D0p channel. The study is based on a data sample corresponding to an integrated luminosity of 3.0 fb−1 of pp collisions recorded by the LHCb experiment. The spectrum of excited Λ+c states that decay into D0p is studied. The masses, widths and quantum numbers of the Λc(2880)+ and Λc(2940)+ resonances are measured. The constraints on the spin and parity for the Λc(2940)+ state are obtained for the first time. A near-threshold enhancement in the D0p amplitude is investigated and found to be consistent with a new resonance, denoted the Λc(2860)+, of spin 3/2 and positive parity.
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Submitted on : Monday, January 30, 2017 - 10:46:51 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Study of the D0p amplitude in Λ0b→D0pπ− decays. Journal of High Energy Physics, Springer Verlag (Germany), 2017, pp.30. ⟨10.1007/JHEP05(2017)030⟩. ⟨in2p3-01449165⟩

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