Description
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Talk title: QCD criticality on light nuclei production in heavy-ion collisions
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Speaker : Dr. Kaijia Sun (Texas A&M University)
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Abstract: Locating the possible critical (end-)point (CEP), characterized by a diverging density-density correlation length,
in the phase diagram of Quantum Chromodynamics (QCD) through the Beam Energy Scan (BES) program
at RHIC is one of the main goals in high-energy nuclear physics. Since the proposal of using
the non-Gaussian fluctuations (PRL 102,032301(2009)) in the net-proton multiplicity distribution
as the probe to the CEP almost one decade ago, little progress has been made in identifying other
observables that are sensitive to the CEP. In this talk, I show, for the first time, that the yield ratios of light nuclei, such as $N_tN_p/N_d^2$, $N_\alpha N_p/(N_{^3He}N_d)$,
and $N_\alpha N_t N_p^2/(N_{^3He}N_d^3)$, increase monotonically as a function of the correlation length.
This novel phenomenon of criticality allows us to locate the QCD critical point through the collision energy
dependence of the yield ratio $N_tN_p/N_d^2$ in relativistic heavy-ion collisions.
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Self-introduction:Kai-Jia Sun, currently a postdoc of the Cyclotron institute in Texas A&M University (TAMU).
He was awarded Ph. D. in physics at Shanghai Jiao Tong University (SJTU) in 2017 and then
went to TAMU as a postdoctoral fellow. His main research interest is in high-energy nuclear
physics, especially in the search for the QCD critical point in relativistic heavy-ion collisions.
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