Measurement of η′(958) formation in two-photon collisions at LEP1

• Autores: Dova, María Teresa; L3 Collaboration
• Año de publicación: 1998
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; Física; Fotones; large electron positron collider; L3 detector
• Institución: Universidad Nacional de La Plata

The formation of the η′ in the reaction e+e−→e+e−η′→e+e−π+π−γ has been measured by the L3 detector at a centre-of-mass energy of 91 GeV. The radiative width of the η′ has been found to be $\text{Γ}{}_{\mathrm{\gamma \gamma }}\text{=4.17±0.10}\text{(stat.)}\text{±0.27}\text{(sys.)}\text{keV}$. The Q² dependence of the η′ formation cross section has been measured for $\text{Q}{}^2\text{≤10}\text{GeV}{}^2$ and the η′ electromagnetic transition form factor has been determined. The form factor can be parametrised by a pole form with $\text{Λ=0.900±0.046}\text{(stat.)}\text{±0.022}\text{(sys.)}\text{GeV}$. It is also consistent with recent non-perturbative QCD calculations.
Facultad de Ciencias Exactas