STAR's measurement of Long-range forward-backward multiplicity correlations as the signature of "dense partonic matter" in the Heavy Ion collisions at $\sqrt{s_{NN}}=$200 GeV.}

TL;DR

This study measures forward-backward multiplicity correlations in heavy ion collisions at 200 GeV, finding strong long-range correlations in central collisions that suggest the formation of dense partonic matter.

Contribution

It provides the first detailed measurement of long-range correlations in various collision systems at RHIC energies, linking them to dense partonic matter formation.

Findings

Strong long-range correlations in central heavy ion collisions

Correlation strength does not scale with participant number

Results support models involving multiple parton interactions

Abstract

Forward-backward multiplicity correlations have been measured with the STAR detector for Au+Au, Cu+Cu and {\it p+p} collisions at $\sqrt{s_{NN}}$ = 200 GeV. A strong, long-range correlation is observed for central heavy ion collisions that vanishes in semi-peripheral events and {\it pp} collisions. There is no apparent scaling of correlation strength with the number of participants involved in the collision. Both the Dual Parton Model and the Color Glass condensate indicate that the long range correlations are due to multiple parton interactions. This suggests that the dense partonic matter might have been created in mid-central and central Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.