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Jet quenching for heavy-ion collisions at the LHC

Description du projet

Une approche de principe premier pour le jet quenching

Les collisions d’ions lourds ultra relativistes dans le Grand collisionneur de hadrons à Genève et le collisionneur d’ions lourds relativistes à New York forment le milieu chaud et dense connu sous le nom de plasma quark-gluon (QGP). L’un des principaux outils expérimentaux permettant de caractériser le QGP est l’analyse de la propagation des quarks et des gluons élémentaires à travers celui-ci. Ces particules élémentaires se fragmentent en jets hautement collimatés qui perdent de l’énergie par le biais d’un phénomène connu sous le nom jet quenching, dont l’étude peut aider à améliorer notre compréhension du comportement du QGP. Sur la base de récentes découvertes suggérant que les jets sont sensibles à la dynamique de pré-équilibre du QGP, le projet JQ4LHC, financé par l’UE, prévoit de développer le premier formalisme ascendant de jet quenching basé sur des principes premiers qui permettront également d’étudier cette dynamique précoce.

Objectif

The characterization of the quark gluon plasma (QGP) created in heavy-ion collisions (HICs) is the main goal of heavy-ion experimental programs at the Relativistic Heavy Ion Collider (RHIC) at BNL (USA) and at the Large Hadron Collider (LHC) at CERN. Jet quenching, the modification of jets in a colored medium, is one of the most successful tools to probe the QGP. This proposal aims to provide an interpretational framework for jet quenching that maximizes the discovery potential of the current (and future) precision era of HICs.

Since the study of jets in the presence of a medium is challenging, we still lack a first-principles formalism for jets in HICs. In contrast, a wide variety of jet quenching Monte Carlos (MCs) are available, but they rely on phenomenological assumptions making difficult to interpret their outcomes. It is proposed here to develop the first jet quenching bottom-up formalism based on first principles. This will be done by generalizing from single hadrons to jets a previous implementation by the experienced researcher (ER), including different phenomena as coherence. This analytical approach will become a unique tool to describe the QGP and benchmark the mainstream MCs.

The theory of jet quenching has been developed assuming a QGP in thermal equilibrium. Recently, the ER has shown for the first time that jets in HICs are sensitive to the pre-equilibrium dynamics of the evolution. This finding paves the way for a completely novel line of research in HICs, whose ambitious goal is to access these poorly understood initial stages with jet quenching observables. This proposal will provide the foundations for such an effort by phenomenologically analyzing the possible explanations to this finding and by computing color field configurations for the initial stages in the Glasma approach.

This project will be developed at the leading institution École Polytechnique and will enhance the skills, career prospects and network of collaborators of the ER.

Coordinateur

ECOLE POLYTECHNIQUE
Contribution nette de l'UE
€ 196 707,84
Adresse
ROUTE DE SACLAY
91128 Palaiseau Cedex
France

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Région
Ile-de-France Ile-de-France Essonne
Type d’activité
Higher or Secondary Education Establishments
Liens
Coût total
€ 196 707,84