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.
2024
109
5
L052201-1
L052201-9
charmounium, hyperons, scattering
Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batoz...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2028011
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