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# Hard Probes 2018: International Conference on Hard & Electromagnetic Probes of High-Energy Nuclear Collisions

30 September 2018 to 5 October 2018
Aix-Les-Bains, Savoie, France
Europe/Zurich timezone
PROCEEDINGS OPEN UNTIL DECEMBER 15th 2018

## Constraining energy loss from high-pt azimuthal asymmetries

2 Oct 2018, 11:05
20m
Aix-Les-Bains, Savoie, France

#### Aix-Les-Bains, Savoie, France

Aix-Les-Bains, Congress Center Student Lectures Day: September 30 at CERN
2a) Jets and high-pT hadrons (TALK)

### Speaker

Dr Carlota Andres (Jefferson Laboratory)

### Description

The nuclear modification factor, $R_{AA}$, has been satisfactorily described by various jet quenching models. Nonetheless, all these formalisms seemed to underpredict the high $p_T$ ($>10$ GeV/c) elliptic flow, $v_2$. Recently, it has been argued that by the inclusion of event-by-event fluctuations in the soft sector the $R_{AA} - v_2$ problem may be solved. In order to confirm that this is indeed the answer to the puzzle, one should consider the effects of changing the energy loss implementation. We will show, within the ASW Quenching Weights and EKRT hydrodynamics, that the description of the high-$p_T$ harmonics is still a challenge and discuss the opportunities that it offers to constrain the detailed mechanism of energy loss.

### Primary author

Dr Carlota Andres (Jefferson Laboratory)

### Co-authors

Nestor Armesto Perez (Universidade de Santiago de Compostela (ES)) Dr Risto Paatelainen (University of Helsinki) Harri Niemi (Johann Wolfgang Goethe-Universität) Maria Pia Zurita