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Nucleon clustering at freezeout, near the QCD critical point

Speaker: Edward Shuryak (Stony Brook Univ.)

Time: Jan. 26 (Tuesday) 6:00am (San Fransisco), 9:00am (New York), 3:00pm (Frankfurt), 7:30pm(New Delhi), 10:00pm (Beijing), 11:00pm (Tokyo)

Abstract: Clustering of nucleons at freezeout has been studied by a number of theoretical tools, including semiclassical (fluctons), hyperharmonics and, lately, direct Path Intergal Monte Carlo. It was found to be effective starting from four nucleons, with "preclusters" feeding into multiple bound states, eventually decaying into channels with light nuclei d, t, 3He and affecting proton distribution (kurtosis). Furthermore, if there exists the QCD critical point (CP) with a correlation length ξ comparable or larger than precluster size, there should be strong and nonmonotonous changes in clustering. Binary long-rangevforces are attractive but manybody (with 3 or 4 nucleons) get strongly repulsive.
  It was further found that near CP these repulsive many-body forces  overcome the binary attraction and should suppressing clustering. Current experimental data on kurtosis and light nuclei production do hint at certain collision energies, at which a drop of clustering may be already observed.

Chair: Krishna Rajagopal

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Starts Jan 26, 2021 22:00
Ends Jan 26, 2021 23:30