Jun 12 – 16, 2017
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Europe/Zurich timezone

Baryon Stopping at RHIC Beam Energy Scan and its Possible Effect on net-protons higher moment analysis

Jun 13, 2017, 3:00 PM
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Nikhef Science Park 105 1098XG Amsterdam The Netherlands


Dhananjaya Thakur (Indian Institute of Technology Indore (IN))


One of the main motivations of heavy ion collision is to explore the QCD phase diagram of strong interaction. In the QCD phase diagram, at large $\mu_{B}$ the existence of critical point (CP) is expected. It is believed that, the non-monotonic behavior of higher moments of the distribution of conserved numbers with $\sqrt{s_{NN}}$ is a probe of the QCD critical point. The net-proton $\kappa\sigma^{2}$, measured by STAR experiment [1] hints for the possibility of existence of critical point around $\sqrt{s_{NN}}$ = 19.6 GeV. However, the measured protons by STAR experiment contain the protons from heavy resonance decay, from baryon stopping and from production.

Since there is a significant contribution of stopped protons at RHIC lower energies it will be important to quantify the stopped protons in their acceptance. Also, these stopped protons fluctuate from event-to-event, which can contribute to the net-proton fluctuations significantly. In the present work we formulate a procedure to estimate the stopped protons in the STAR acceptance [2]. Further, we briefly discuses it's implication to the net-proton fluctuation results by STAR experiment.


[1] “Energy Dependence of Moments of Net-proton Multiplicity Distributions at RHIC”
L. Adamczyk et al.[STAR Collaboration], Phys. Rev.Lett.112, 032302 (2014).

[2] “Estimation of Stopped Protons at RHIC BES Energies”
arXiv:1611.05078 (Phys. Rev. C (In Press))

List of tracks Charge fluctuations, correlations and balance functions

Primary authors

Dhananjaya Thakur (Indian Institute of Technology Indore (IN)) Mr Sunil Jakhar (Indian Institute of Technology Indore) Dr Prakhar Garg (Stony Brook University) Raghunath Sahoo (Indian Institute of Technology Indore (IN))

Presentation materials