Evidence of a dibaryon spectrum in coherent ?0?0d photoproduction at forward deuteron angles

The coherent reaction, ?d??0?0d was studied with the BGOOD experiment at ELSA from threshold to a centre-of-mass energy of 2850 MeV. A full kinematic reconstruction made, final state deuterons identified in forward spectrometer and ?0 decays central BGO Rugby Ball. strength differential cross section exceeds what can be described by models photoproduction instead supports three isoscalar dibaryon candidates reported ELPH collaboration 2.38, 2.47 2.63 GeV/c2. low mass enhancement ?0?0 invariant is also observed d?(2380) which consistent ABC effect. At higher energies, narrow peak ?0d 2114 MeV/c2 width 20 sequential two-dibaryon decay mechanism.