The d*(2380) dibaryon resonance width and decay branching ratios

作者：Gal A^*

来源：Physics Letters B, 2017, 769: 436-440.

DOI：10.1016/j.physletb.2017.03.040

• Pion-assisted dibaryons
• d*(2380) Delta Delta dibaryon

Attempts to reproduce theoretically the width Gamma(d*) = 80 +/- 10 MeV of the I(J(p)) = 0(3+) d*(2380) dibaryon resonance established by the WASA-at-COSY Collaboration are discussed. The validity of associating the d*(2380) in quark -based models exclusively with a tightly bound Delta Delta configuration is questioned. The d*(2380) width and decay branching ratios into NN pi pi, NN pi and NN final states are studied within the Gal-Garcilazo hadronic model in which the d*(2380) is a pi N Delta resonance embedded in the NN pi pi continuum some 80 MeV below the AA threshold. In particular, predictions are made for the branching ratios of the unobserved yet d*(2380) -> NN pi decays which are suppressed in a purely -Delta Delta dibaryon model. A possible connection of the ABC effect observed in the pn -> d* -> d pi(0) pi(0) resonance reaction to the d*(2380) dibaryon is noted.

• 出版日期2017-6-10