2013/08/08 by Shanahan, P. E., Thomas, A. W., Young, R. D. · 1 citation
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.1308.1748
Recent lattice QCD calculations from the HAL and NPLQCD Collaborations have reported evidence for the existence of a bound state with strangeness -2 and baryon number 2 at quark masses somewhat higher than the physical values. A controlled chiral extrapolation of these lattice results to the physical point suggested that the state, identified with the famed H dibaryon, is most likely slightly unbound (by 13 ± 14 MeV) with respect to the Λ--Λ threshold. We report the results of an updated analysis which finds the H unbound by 26 ± 11 MeV. Apart from the insight it would give us into how QCD is realized in Nature, the H is of great interest because of its potential implications for the equation of state of dense matter and studies of neutron stars. It may also explain the enhancement above the Λ--Λ threshold already reported experimentally. It is clearly of great importance that the latter be pursued in experiments at the new J-PARC facility.