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Jude, T.C.; Alef, S.; Beck, R.; Braghieri, A.; Cole, P.L.; Elsner, D.; Di Salvo, R.; Fantini, A.; Freyermuth, O.; Frommberger, F.; Ghio, F.; Gridnev, A.; Kohl, K.; Kozlenko, N.; Lapik, A.; Levi Sandri, P.; Lisin, V.; Mandaglio, G.; Moricciani, D.; Nedorezov, V.; Novinskiy, D.; Pedroni, P.; Polonskiy, A.; Reitz, B.-E.; Romaniuk, M.; Scheluchin, G.; Schmieden, H.; Stuglev, A.; Sumachev, V.; Tarakanov, V.
Physics letters. B, 09/2022, Volume: 832Journal Article
The coherent reaction, γd→π0π0d was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850MeV. A full kinematic reconstruction was made, with final state deuterons identified in the forward spectrometer and π0 decays in the central BGO Rugby Ball. The strength of the differential cross section exceeds what can be described by models of coherent photoproduction and instead supports the three isoscalar dibaryon candidates reported by the ELPH collaboration at 2.38, 2.47 and 2.63GeV/c2. A low mass enhancement in the π0π0 invariant mass is also observed at the d⁎(2380) centre-of-mass energy which is consistent with the ABC effect. At higher centre-of-mass energies, a narrow peak in the π0d invariant mass at 2114MeV/c2 with a width of 20MeV/c2 supports a sequential two-dibaryon decay mechanism.
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