Measurement of Direct f0(980) Photoproduction on the Proton

Le résumé fourni par la source

We report on the results of the first measurement of exclusive ${f}_{0}(980)$ meson photoproduction on protons for ${E}_{\ensuremath{\gamma}}=3.0--3.8\text{ }\text{ }\mathrm{GeV}$ and $\ensuremath{-}t=0.4--1.0\text{ }\text{ }\mathrm{Ge}{\mathrm{V}}^{2}$. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ channel by performing a partial wave analysis of the reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. Clear evidence of the ${f}_{0}(980)$ meson was found in the interference between $P$ and $S$ waves at ${M}_{{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}}\ensuremath{\sim}1\text{ }\text{ }\mathrm{GeV}$. The $S$-wave differential cross section integrated in the mass range of the ${f}_{0}(980)$ was found to be a factor of about 50 smaller than the cross section for the $\ensuremath{\rho}$ meson. This is the first time the ${f}_{0}(980)$ meson has been measured in a photoproduction experiment.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.