Search for an Isospin I =3 Dibaryon
  Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance $d^*(2380)$ with $I(J^P) = 0(3^+)$ there should also exist a dibaryon resonance with mirrored quantum numbers $I(J^P) = 3(0^+)$. We report here on a search for such a $NN$-decoupled state in data on the $pp \to pp\pi^+\pi^+\pi^-\pi^-$ reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280 - 2500 MeV. 
P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F.S. Bergmann,   M. Berlowski, H. Bhatt, A. Bondar, M. Buescher, H. Ca...
nucl-ex hep-ex