Measurement of the space-time extent of the emission source in d+Au and Au+Au collisions through charged pion interferometry at $\sqrt{s_{NN}}=200$ GeV

May 20, 2014, 4:30 PM
spectrum (darmstadtium)



Board: I-01
Poster Correlations and Fluctuations Poster session


Nuggehalli Ajitanand (SUNY Stony Brook)


The recent observation of azimuthal correlations in p+Pb collisions at LHC is consistent with an interpretation as either an initial state gluon saturation effect or the expansion dynamics of a QGP like medium. It is well known that the latter process is characterized by strong final state re-scattering effects. In this work two-pion interferometry measurements in d+Au and Au+Au collisions at √sNN = 200 GeV are performed to extract and compare the Gaussian source radii Rout, Rside and Rlong, which characterize the space-time extent of the emission sources. The comparisons which are carried out as a function of collision centrality and the mean transverse momentum for pion pairs, indicate strikingly similar patterns for the d+Au and Au+Au systems. They also indicate linear dependence of Rside on the initial traverse geometric size, as well as a smaller freeze-out size for the d+Au system. These patterns point to the important role of final-state re-scattering effects in the reaction dynamics of d+Au collisions.
On behalf of collaboration: PHENIX

Primary author

Nuggehalli Ajitanand (SUNY Stony Brook)

Presentation materials