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Abstract
We present the first measurement of the proton–Ω correlation function in heavy-ion collisions for the central (0–40%) and peripheral (40–80%) Au + Au collisions at sNN=200 GeV by the STAR experiment at the Relativistic Heavy-Ion Collider (RHIC). Predictions for the ratio of peripheral collisions to central collisions for the proton–Ω correlation function are sensitive to the presence of a nucleon–Ω bound state. These predictions are based on the proton–Ω interaction extracted from (2+1)-flavor lattice QCD calculations at the physical point. The measured ratio of the proton–Ω correlation function between the peripheral (small system) and central (large system) collisions is less than unity for relative momentum smaller than 40 MeV/c. Comparison of our measured correlation ratio with theoretical calculation slightly favors a proton–Ω bound system with a binding energy of ∼ 27 MeV.
Highlights
Recent WorkPowered by the California Digital Library University of California arXiv:1808.02511v1 [hep-ex] 7 Aug 2018
The study of nucleon-nucleon (NN), hyperon-nucleon (YN) and hyperon-hyperon (YY) interactions are of fundamental importance in understanding relativistic heavyion collisions [1, 2], modeling of neutron stars [3–6] and examining the existence of various exotic hadrons [7–9]
With the development of sophisticated computational techniques, it has become possible to carry out first principle calculations based on lattice Quantum Chromodynamics (QCD) to provide constraints on some of the NN, YY and YN interactions [11–15]
Summary
Powered by the California Digital Library University of California arXiv:1808.02511v1 [hep-ex] 7 Aug 2018. Predictions for the ratio of peripheral collisions to central collisions for the proton-Ω correlation function are sensitive to the presence of a nucleon-Ω bound state. These predictions are based on the proton-Ω interaction extracted from (2+1)-flavor lattice QCD calculations at the physical point.
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