2012/01/17 by Michael I. Buchoff, Thomas Luu, Thomas C. Luu +1 · 2 citations
Physics and Astronomy · #Atomic physics #Baryon #Cold Atom Physics and Bose-Einstein Condensates #Excited state #Ground state #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Omega #Particle physics #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Scattering #Strangeness #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.85.094511
21 pages, 10 figs
arxiv created 2012/01/17 · openalex publication_date 2012/05/30 · arxiv updated 2013/05/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We explore the interactions of two strangeness \ensuremath-3 baryons in multiple spin channels with lattice QCD. This system provides an ideal laboratory for exploring the interactions of multibaryon systems with minimal dependence on light-quark masses. Model calculations of the two-\ensuremathΩ^\ensuremath- system in two previous works have obtained conflicting results, which can be resolved by lattice QCD. The lattice calculations are performed using two different volumes with L\ensuremath∼2.5 and 3.9 fm on anisotropic clover lattices at m_\ensuremathπ\ensuremath∼390 MeV with a lattice spacing of as\ensuremath∼0.123 fm in the spatial direction and at\ensuremath∼as/3.5 in the temporal direction. Using multiple interpolating operators from a nondisplaced source, we present scattering information for two ground state \ensuremathΩ^\ensuremath- baryons in both the S=0 and S=2 channels. For S=0, kcot\ensuremathδ is extracted at two volumes, which lead to an extrapolated scattering length of aS=0^\ensuremathΩ\ensuremathΩ=0.16\ifmmode±\else\textpm\fi0.22 fm, indicating a weakly repulsive interaction. Additionally, for S=2, two separate highly repulsive states are observed. We also present results on the interactions of the excited strangeness \ensuremath-3, spin-(1)/(2) states with the ground spin-(3)/(2) states for the spin-1 and spin-2 channels. Results for these interactions are consistent with attractive behavior.