Electroproduction of the d* dibaryon

الأصل · EN

The unpolarized cross section for the electroproduction of the isoscalar Jπ= 3+ di-delta dibaryon d* is calculated for deuteron target using a simple picture of elastic electron-baryon scattering from the ΔΔ(⁷D₁) and the NN (³S₁) components of the deuteron. The calculated differential cross section at the electron lab energy of 1 GeV has the value of about 0.24 (0.05) nb/sr at the lab angle of 10∘ (30∘) 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*(ΔΔ⁷S₃) combined with a small experimental upper bound of 0.08 MeV for the d* decay width appears to have excluded any low-mass d* model containing a significant admixture of the ΔΔ(⁷S₃) configuration.