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Probing nuclear parton dynamics in Heavy-Ion Collisions with Hard Probes

Project description

New models to improve understanding of high-energy particle collisions

In high-energy particle collisions, like those detected in particle accelerators, scientists study how particles interact and lose energy in extreme environments. For example, jets of particles passing through the quark-gluon plasma (QGP) – a hot, dense medium created in these collisions – lose more energy than current theories can explain. Furthermore, tightly packed particles called gluons behave in ways that cannot be fully understood, while electromagnetic effects in nuclear collisions reveal fascinating details about atomic nuclei. With the support of the Marie Skłodowska-Curie Actions programme, the HIC-HP project plans to develop better models to explain jet energy loss in the QGP. Researchers will study gluon behaviour in dense environments and analyse electromagnetic effects in nuclear collisions.

Objective

Perturbative QCD (pQCD) derived from first principles, is used to predict experimental observations involving large momentum transfer, such as high-energy jet productions in proton-proton collisions, and the strong interaction between the jet and the Quark-Gluon Plasma (QGP) medium created in nucleus-nucleus collisions. Recent experimental observations have shown that stronger energy-loss mechanism is at play for jets with large transverse momentum, which current perturbative approaches failed to describe. Utilizing an incoherent approach, I will derive an improved energy-loss mechanism that can provide accurate description of the nuclear modification at large jet momentum, which can restore the predictive power of pQCD and allow us to extract the transport property of the hot nuclear medium. The theory of pQCD also anticipates a saturation phenomenon, whereby the density of gluons tends to arrive at equilibrium between the splitting and recombination of gluon quantum fluctuations as the momentum fraction becomes smaller. Recent theoretical development have mitigated the negativity and instability problem that appears in next-to-leading order calculations of forward jet productions under the Color Glass Condensate framework that takes into account the gluon saturation phenomenon. I will also develop a numerical program which incorporates this new approach to implement saturation effects in order to provide a reliable tool in search of saturation signal in current proton-nucleus collisions. The electromagnetic (EM) properties of the nucleus is also of great interest in ultra-peripheral collision (UPC) physics, where the EM form-factor of the nucleus under the GTMD prescription provides a 5-dimensional Wigner distribution of the nucleus. I will also construct a framework using GTMD approach and recent UPC experimental data to analyse the different quantum effects that appears as the EM background in a nucleus-nucleus collision.

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Topic(s)

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HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

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(opens in new window) HORIZON-MSCA-2024-PF-01

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Coordinator

UNIVERSIDAD DE SANTIAGO DE COMPOSTELA
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 209 914,56
Address
COLEXIO DE SAN XEROME PRAZA DO OBRADOIRO S/N
15782 Santiago De Compostela
Spain

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Region
Noroeste Galicia A Coruña
Activity type
Higher or Secondary Education Establishments
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Total cost

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