Using an e(+)e(-) collision data sample of ( 10 087 +/- 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 novelmethod. The Lambda+ hyperons are produced by the collisions of Sigma(+) hyperons from J/. decays with nuclei in the material of the BESIII detector. The total cross section of Lambda + Be-9 -> 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(-) , 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 Λ¯
Garzia, I.;Gramigna, S.;
2024
Abstract
Using an e(+)e(-) collision data sample of ( 10 087 +/- 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 novelmethod. The Lambda+ hyperons are produced by the collisions of Sigma(+) hyperons from J/. decays with nuclei in the material of the BESIII detector. The total cross section of Lambda + Be-9 -> 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(-) , 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.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.