The nucleon(N)-Omega(Ω) system in the S-wave and spin-2 channel (S25) is studied from the (2+1)-flavor lattice QCD with nearly physical quark masses (m π ≃146MeV and m K ≃525MeV). The time-dependent HAL QCD method is employed to convert the lattice QCD data of the two-baryon correlation function to the baryon-baryon potential and eventually to the scattering observables. The NΩ(S25) potential, obtained under the assumption that its couplings to the D-wave octet-baryon pairs are small, is found to be attractive in all distances and to produce a quasi-bound state near unitarity: In this channel, the scattering length, the effective range and the binding energy from QCD alone read a 0 =5.30(0.44)( −0.01 +0.16 )fm, r eff =1.26(0.01)( −0.01 +0.02 )fm, B=1.54(0.30)( −0.10 +0.04 )MeV, respectively. Including the extra Coulomb attraction, the binding energy of pΩ − (S25) becomes B pΩ − =2.46(0.34)( −0.11 +0.04 )MeV. Such a spin-2 pΩ − state could be searched through two-particle correlations in p-p, p-nucleus and nucleus-nucleus collisions.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - May 10 2019|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics