Jet quenching in high-energy heavy-ion collisions (1511.00790v2)

Abstract: Jet quenching in high-energy heavy-ion collisions can be used to probe properties of hot and dense quark-gluon plasma. We provide a brief introduction to the concept and framework for the study of jet quenching. Different approaches and implementation of multiple scattering and parton energy loss are discussed. Recent progresses in the theoretical and phenomenological studies of jet quenching in heavy-ion collisions at RHIC and LHC are reviewed.

• The paper provides a comprehensive analysis of jet quenching processes to characterize quark-gluon plasma through partonic energy loss mechanisms.
• It details various formalisms, including BDMPS-Z, GLV, AMY, and HT, to model both elastic and inelastic interactions within the medium.
• The study emphasizes the quantification of the jet transport coefficient, revealing temperature-dependent features from RHIC to LHC experiments.

Jet Quenching in High-Energy Heavy-Ion Collisions

The paper by Guang-You Qin and Xin-Nian Wang explores the intricate phenomenon of jet quenching, focusing on its occurrence during high-energy heavy-ion collisions, such as those conducted at RHIC and LHC. Their comprehensive review traverses the theoretical framework and experimental observations that have furthered the understanding of the quark-gluon plasma (QGP) through examining jet quenching phenomena.

Theoretical Frameworks and Jet Quenching Formalisms:

The authors provide a meticulous analysis of different formalisms deployed in modeling jet quenching processes—chief among them being the BDMPS-Z, GLV, AMY, and HT formalisms. The paper details how these frameworks address the complexities of parton energy loss mechanisms, which occur due to both elastic and inelastic interactions with the QGP. It is articulated how these interactions lead to partonic energy dissipation, which is accessible through various observables such as the nuclear modification factor $R_{AA}$.

Phenomenological Insights:

Recent advances in both theoretical and phenomenological studies are highlighted, particularly regarding the quantification of the jet transport coefficient $\hat{q}$, which serves as a critical proxy for the QGP properties. The authors underscore the systematic efforts to pin down $\hat{q}$ at both RHIC and LHC, employing data from a wide array of experiments. Such efforts have fostered a refined understanding of the QGP's transport properties, with findings suggesting temperature-dependent $\hat{q}/T^3$ values that vary between RHIC and LHC conditions.

Full Jet Observables:

The paper expounds upon full jet studies, emphasizing the transition from leading particle to reconstructed jet analyses. This transformation enables researchers to investigate the broader dynamics of jet-medium interactions. Experimental observations from the LHC, such as those measuring jet energies and jet shapes, are discussed in conjunction with theoretical predictions, fostering a deeper examination into the jet energy loss mechanisms and substructure modifications influenced by QGP conditions.

Future Considerations:

Speculatively, the authors discuss future advancements that could arise from deeper integration of NLO corrections in existing models. They posit that such developments are crucial for decreasing model reliance and improving predictions regarding QGP characteristics. Furthermore, a clearer understanding of medium responses to jets—incorporating both hydrodynamic simulations and partonic models—remains imperative.

In summary, this well-structured examination by Qin and Wang delineates the progress and challenges in jet quenching research. Their effort to synthesize theoretical, experimental, and phenomenological findings provides a robust platform for future investigations aimed at elucidating the nature of the quark-gluon plasma.