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Nuclear Physics Seminars at BNL

# Higher-Order Cumulants of Proton Multiplicity Distributions in fixed target Au+Au Collisions at 3 GeV

## by Samuel Happelmann (UC Davis)

US/Eastern
Description

We report cumulants of the proton multiplicity distribution from dedicated fixed-target Au+Au collisions at $\sqrt{s_{_{\mathrm{NN}}}}$ = 3.0 GeV, measured by the STAR experiment in the kinematic acceptance of rapidity ($y$) and transverse momentum ($p_{\rm T}$) within $-0.5 < y<0$ and $0.4 < p_{\rm T} <2.0$ GeV/$c$. In the most central 0--5$\%$ collisions, a proton cumulant ratio is measured to be $C_4/C_2=-0.85 \pm 0.09 ~(\rm stat.) \pm 0.82 ~(\rm syst.)$, which is less than unity, the Poisson baseline. The hadronic transport UrQMD model reproduces our $C_4/C_2$ in the measured acceptance. Compared to higher energy results and the transport model calculations, the suppression in $C_4/C_2$ is consistent with fluctuations driven by baryon number conservation and indicates an energy regime dominated by hadronic interactions. These data imply that the QCD critical region, if created in heavy-ion collisions, could only exist at energies higher than 3$\,$GeV.

The link to the recording is here:

https://bnl.zoomgov.com/rec/share/fxN41W8A5qFaPriuzNQDx_H1inlKNb6qzzF35KztY8Pdtw6VQ9VSCBmBgFZLDvVq.33K8uIQvl6JRX5_Z

Passcode: T1Ke.*N?

The slides can be found here:

Organized by

Prithwish Tribedy

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