New observation of s=−2 heavy H+ stable dibaryon

Search for theHdibaryon on the lattice

“…3, the resulting mass differences extrapolated to physical quark mass value using the ansatz in Eq. (8). We note that the slope of a linear fit in m 2 is slightly different at all lattice spacings.…”

“…Thus there still remains a possibility of a shallow bound state or a resonance in this channel. Since the Bag Model prediction of a deeply bound H-dibaryon, with large binding energy of Oð100Þ MeV [5], many experiments have been triggered to look for this possible particle, but few of them have confirmed the existence of the H-dibaryon [6][7][8][9][10]. The experiments were inspired by the Skyrme model prediction, and the experimental discoveries have in turn spawned intense interest on the theoretical side, with studies ranging from chiral soliton and large N c models, quark models, phase-shift analysis and QCD sum rules [11].…”

H Dibaryon

“…Most of the groups have reported that no evidence was found for the H-dibaryon. However, Shahbazian et al 79), 80), 81), 82), 83) reported some H-dibaryon candidates including Hdibaryon excited states. Alekseev et al 84) also reported two candidate events of the Hdibaryon with M H = 2217.1 ± 7.…”

“…∼ 2231 MeV Shahbazian et al 79), 80), 81), 82), 83) p 118) p + Xe → K + HX, K + K + HX / H → Σ − + p Condo et al 78) p + A → H + X / H → Σ − + p Ejiri et al 85) d → H + β + ν, 10 Be → 8 Be + H, M H < 1875.1 MeV 72 Ge → 70 Ge + H + γ, 127 123) Pb+Pb collision CERN ALICE 125) Pb+Pb collision CERN OPAL 124) Z 0 decay F, G, H and I are positively charged, and claimed to be a member of isotriplet together with neutral particle events, D and E.) These events, however, are controversial and more careful background event analysis and further experimental supports are needed. Anyway, few events with different masses cannot lead to any conclusion.…”