‘‘Inevitable’’ nonstrange dibaryon

Quark-model study of few-baryon systems

“…We compare in figure 11 the ∆∆ potential for two S waves, a Pauli blocked channel, 5 S 2 (T = 3), and a non-Pauli blocked one, 5 S 2 (T = 1). While the last one presents a soft attractive behaviour at short distances, the 5 S 2 (T = 3) channel shows a strong repulsive core coming from the fast decreasing of the overlapping of the two-baryon wave function It is interesting to analyze the possible existence of bound states with the chiral constituent quark model since this has been the object of study of the ∆∆ system with quark models containing confinement plus OGE potentials [79,[95][96][97][98]. In table 4 results of reference [71], based on the chiral constituent quark model, are compared to those of references [79,95,98], based on a OGE model.…”

Recent Results from WASA-at-COSY

“…The Los Alamos theory group [36] originally predicted its mass to be lower by as much as 200 MeV. However, its recent calculations [37] agree with the experimental value.…”

“…The notation d * was used already by Goldman et.al. [36] when predicting the so-called "inevitable dibaryon" with identical quantum numbers.…”

Resonances at COSY — the dibaryon issue

“…Goldman et al [43] pointed out 1989 that due to the unique symmetries of such a state any model based on con¿nement and effective one-gluon exchange must predict the existence of this statecalling it the "inevitable" dibaryon. However, initially they predicted an enormous binding energy as large as 350 MeV for such a state.…”

“…Also, the notation d * was used already by Goldman et.al. [43] when predicting the so-called "inevitable dibaryon" with identical quantum numbers.…”