Electroproduction of the d* dibaryon - art. no. 064011

The unpolarized cross section for the electroproduction of the isoscalar J( pi) = 3(+) didelta dibaryon d* is calculated for a deuteron target using a simple picture of elastic electron-baryon scattering from the Delta Delta(D -7(1)) and the NN(S-3(1)) components of the deuteron. The calculated differ ential cross section at the electron laboratory energy of 1 GeV has a value of about 0.24 (0.05) nb/sr at the laboratory angle of 10 degrees (30 degre es) for the Bonn B potential when the dibaryon mass is taken to be 2.1 GeV. The cross section decreases rapidly with increasing dibaryon mass. A large calculated width of 40 MeV for d*(Delta Delta S-7(3)) combined with a smal l experimental upper bound of 0.08 MeV for the d* decay width appears to ha ve excluded any low-mass d* model containing a significant admixture of the Delta Delta(S-7(3)) configuration.