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Jun 24 – 28, 2019
US/Eastern timezone
5th International Conference on the Initial Stages in High-Energy Nuclear Collisions

How to infer the shape of the QGP droplet from the data

Jun 26, 2019, 3:00 PM
329 (Pupin)



Oral High pT probes of the initial state Parallel: High pT probes of the initial state


Magdalena Djordjevic (Institute of Physics Belgrade)


We propose an approach to extract the spatial anisotropy of QGP formed in ultrarelativistic heavy-ion collisions from measured high-pt observables $R_{AA}$ and $v_2$. We show, through analytical arguments, numerical calculations, and comparison with experimental data, that $v_2/(1-R_{AA})$ reaches a well-defined saturation value at high $p_\perp$, which is in turn proportional to the initial anisotropy. We provide first anisotropy estimates from our approach, and compare them with predictions of various (fundamentally unrelated) initial state models. With expected future significant reduction of experimental errors, the anisotropy extracted from experimental data will strongly constrain the calculations of initial particle production in heavy-ion collisions and thus test our understanding of QGP physics.

Primary authors

Magdalena Djordjevic (Institute of Physics Belgrade) Mr Stojku Stefan (Institute of Physics Belgrade) Prof. Marko Djordjevic (University of Belgrade) Dr Pasi Huovinen (Institute of Physics Belgrade)

Presentation materials