Speaker
Description
Femtoscopic correlations with the $π^0π^0$ pair are measured in photoprodution at $E_{\gamma}$=1.3−2.4 GeV to extract the space-time geometry of the pion emission region. The $π^0π^0$ photoprodution experiment was carried out at Spring-8 BL31LEP with a linearly polarized photon beam using a 4π electromagnetic calorimeter BGOegg. Enhancement due to quantum statistics arising from Bose-Einstein correlations at small relative momenta is observed. The Gaussian radius of the pion source is extracted at several photon beam energy bins. And the strength of the $π^0π^0$ correlations in the case where the $π^0N$ sequential decays are suppressed is greater than that in the case where the $π^0N$ sequential decays are note suppressed. Including strong final-state interaction (FSI) for $π^0π^0$ through resonances may provide more interesting information about possible existence of bound states and scattering parameters of the involved channels in the interactions.
