2020/04/30 by Shuntaro Sakai, Feng-Kun Guo, Bastian Kubis · 17 citations
Chemistry · Physics and Astronomy · #Atomic physics #Chemistry #Chromatography #Extraction (chemistry) #High-Energy Particle Collisions Research #Materials science #Optics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Scattering #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1016/j.physletb.2020.135623
published in Physics Letters B 808, 135623 (Elsevier BV) · 9 pages, 6 figures; version to be published in Phys. Lett. B
openalex created_date 2020/05/01 · openalex publication_date 2020/07/21 · arxiv created 2020/07/22 · arxiv updated 2020/07/29 · openalex updated_date 2026/08/05
The isovector and isoscalar ND s-wave scattering lengths are extracted by fitting to the LHCb data of the pD0 invariant-mass distribution in the decay Λb→π−pD0, making use of the cusp effect at the nD+ threshold. The analysis is based on a coupled-channel nonrelativistic effective field theory. We find that the real part of the isovector ND scattering length is unnaturally large due to the existence of a near-threshold state with a mass around 2.8 GeV. The state is consistent with the Σc(2800)+ resonance observed at Belle. Our results suggest that it couples strongly to the ND channel in an s-wave, and that its quantum numbers are JP=1/2−. The strong cusp behavior at the nD+ threshold can be verified using updated LHCb data.