Using an e+e- collision data sample of (10087 +/- 44) x 10^6 J/psi events taken at the center-of-mass energy of 3.097 GeV by the BESIII detector at the BEPCII collider, the process Lambda + N -> Sigma+ + X is studied for the first time employing a novel method. The Sigma+ hyperons are produced by the collisions of Lambda hyperons from J/psi decays with nuclei in the material of the BESIII detector. The total cross section of Lambda + 9Be -> Sigma+ + X is measured to be sigma = (37.3 +/- 4.7 +/- 3.5) mb with Lambda momenta within [1.057, 1.091] GeV/c, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of Lambda-nucleon interactions at an e+e- collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars.
First measurement of ΛN inelastic scattering with Λ from e+e-→J/ψ→ Λ Λbar
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
Using an e+e- collision data sample of (10087 +/- 44) x 10^6 J/psi events taken at the center-of-mass energy of 3.097 GeV by the BESIII detector at the BEPCII collider, the process Lambda + N -> Sigma+ + X is studied for the first time employing a novel method. The Sigma+ hyperons are produced by the collisions of Lambda hyperons from J/psi decays with nuclei in the material of the BESIII detector. The total cross section of Lambda + 9Be -> Sigma+ + X is measured to be sigma = (37.3 +/- 4.7 +/- 3.5) mb with Lambda momenta within [1.057, 1.091] GeV/c, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of Lambda-nucleon interactions at an e+e- collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars.File | Dimensione | Formato | |
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PhysRevC.109.L052201.pdf
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