First measurements of pT correlations in Au+Au collisions at 3-7.7 GeV reveal non-monotonic energy dependence in central events with 5 sigma significance, breaking 1/sqrt(N_part) scaling.
Adamet al.(STAR Collaboration), Phys
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abstract
We present two-particle $p_{\rm t}$ correlations as a function of event centrality for Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV at the Relativistic Heavy Ion Collider using the STAR detector. These results are compared to previous measurements from CERES at the Super Proton Synchrotron and from ALICE at the Large Hadron Collider. The data are compared with UrQMD model calculations and with a model based on a Boltzmann-Langevin approach incorporating effects from thermalization. The relative dynamical correlations for Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 200 GeV show a power law dependence on the number of participant nucleons and agree with the results for Pb+Pb collisions at $\sqrt{s_{\rm NN}} = 2.76~ {\rm TeV}$ from ALICE. As the collision energy is lowered from $\sqrt{s_{\rm NN}}$ = 200 GeV to 7.7 GeV, the centrality dependence of the relative dynamical correlations departs from the power law behavior observed at the higher collision energies. In central collisions, the relative dynamical correlations increase with collision energy up to $\sqrt{s_{\rm NN}}$ = 200 GeV in contrast to previous measurements that showed little dependence on the collision energy.
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Mean transverse momentum fluctuations in baryon-rich matter are driven by energy and baryon density variations, remain robust to baryon diffusion, and show splitting between protons and antiprotons.
The shape of v0(pT), not its zero-crossing, encodes physical information about radial flow because centrality and normalization choices only shift the curve vertically without changing its form.
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Non-Monotonicity of Transverse Momentum Correlations in Au + Au Collisions at RHIC
First measurements of pT correlations in Au+Au collisions at 3-7.7 GeV reveal non-monotonic energy dependence in central events with 5 sigma significance, breaking 1/sqrt(N_part) scaling.
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The shape of differential radial flow $v_0(p_T)$, not its zero-crossing, carries physical information
The shape of v0(pT), not its zero-crossing, encodes physical information about radial flow because centrality and normalization choices only shift the curve vertically without changing its form.