Spectrum of two-flavored spin-zero heavy dibaryons in lattice QCD
Abstract
We present the ground state energy spectra of two-flavored heavy dibaryons in the spin-singlet channel. In particular, the ground state masses of llQllQ, QlQllQ and QlQQlQ states are computed and compared with their respective lowest non-interacting energy levels, where the flavor Q ∈ (c,b) denotes charm and bottom quarks, and the other flavor l ∈ s,c,b represents strange, charm and bottom, respectively. Considering their valence quark structures, these hadrons could be thought of as the heavy flavor analogues of spin-singlet nucleon-nucleon states. The gauge configurations employed in this study are HISQ ensembles with Nf = 2+1+1 flavors, generated by the MILC collaboration, at four lattice spacings, namely a=0.1207, 0.0888, 0.0582 and 0.0448 fm. The aforementioned states are also computed at different quark masses, between ms ml mb, including at unphysical heavy quark masses, to explore the quark mass dependence of any possible binding. For the dibaryon states bbcbbc, ccbccb and ccb bbc, we find a clear evidence of an energy level below their respective non-interacting energy levels. In addition, for these dibaryons at quark masses mc < ml mb, a trend is found where the gap, between the lowest energy levels and the respective lowest non-interacting levels, increases as the quark mass ml increases. We also study the heavy quark spin-symmetry and its breaking for these heavy dibaryons.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.