Photoproduction of the f2(1270) Meson Using the CLAS Detector

Le résumé fourni par la source

The quark structure of the ${f}_{2}(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\overline{q}$) resonance with quantum numbers ${J}^{\mathrm{PC}}={2}^{++}$. Recently, it was proposed that the ${f}_{2}(1270)$ is a molecular state made from the attractive interaction of two $\ensuremath{\rho}$ mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay $\ensuremath{\rho}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}p$, using the CEBAF Large Acceptance Spectrometer detector at Jefferson Lab for incident beam energies between 3.6 and 5.4 GeV. Differential cross sections, $d\ensuremath{\sigma}/dt$, for ${f}_{2}(1270)$ photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.

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