2016/07/31 by Kai-Jia Sun, Lie-Wen Chen · 1 citation
Physics and Astronomy · #Coalescence (physics) #Hadron #High-Energy Particle Collisions Research #Lambda #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark model #Quarkonium #hep-ph #nucl-ex #nucl-th
paper · pdf · doi:10.1103/physrevc.94.064908
published as Phys. Rev. C 94, 064908 (2016) · 6 pages, 4 figures, 2 tables. Minor modifications. Accepted version to appear in PRC
openalex created_date 2016/08/23 · arxiv created 2016/12/09 · openalex publication_date 2016/12/27 · arxiv updated 2017/01/04 · openalex updated_date 2026/08/05
We study the production of \mathrm\ensuremathΛ\mathrm\ensuremathΛ and \mathrm\ensuremathΛn exotic states in central Pb+Pb collisions at √sNN=2.76 TeV at the CERN Large Hadron Collider (LHC) via both hadron and quark coalescence within a covariant coalescence model with a blast-wave-like parametrization for the phase-space configurations of constituent particles at freeze-out. In the hadron coalescence, the two states are considered as molecular states while they are considered as six-quark states in the quark coalescence. For \mathrm\ensuremathΛn, we find that the yields of both molecular and six-quark states are much larger than the experimental upper-limits. For \mathrm\ensuremathΛ\mathrm\ensuremathΛ, while the molecule-state yield is much larger than the experimental upper limits, the six-quark-state yield could be lower than the upper limits. The higher molecule-state yields are mainly due to the large contribution of short-lived strong resonance decays into (anti-)nucleons and (anti-)\mathrm\ensuremathΛ which can significantly enhance the molecule-state yields of \mathrm\ensuremathΛ\mathrm\ensuremathΛ and \mathrm\ensuremathΛn via hadron coalescence. Our results suggest that the current experimental measurement at the LHC cannot exclude the existence of the \mathrm\ensuremathΛ\mathrm\ensuremathΛ as an exotic six-quark state, and if \mathrm\ensuremathΛ\mathrm\ensuremathΛ is a six-quark state, it is then on the brink of being discovered.