Abstract
The ALICE collaboration at CERN has dedicated a significant part of its physics program to study jet formation and modification in the hot and dense environment formed in heavy-ion collisions. These proceedings will summarize the latest insights we have gained about this process using data collected during Pb-Pb collisions at TeV. In particular π0-hadron correlations, jet mass measurements, and jet shapes of small-radius jets show a significant influence of the hot and dense medium on the measured jet fragmentation process.
Highlights
In recent years the qualitative investigation of jet modification in terms of jet suppression, such as RAA measurements of individual high-pT particles or reconstructed jets, has been succeeded by more differential observables that dissect the jet structure itself [1, 2]
Such a redistribution of energy among the jet fragments was confirmed by complementary observables of jet-fragment distributions as a function of the radial distance to the jet axis (r) [12, 13, 14] and the parton momentum fraction carried by the final state hadron (z) [6, 7, 8, 9]
Measurements of the modified jet fragmentation function in Pb–Pb collisions [6] led to the discussion of “survivor bias” caused by a different quenching of quark vs. gluon jets [15]
Summary
In recent years the qualitative investigation of jet modification in terms of jet suppression, such as RAA measurements of individual high-pT particles (with pT being their transverse momentum) or reconstructed jets, has been succeeded by more differential observables that dissect the jet structure itself [1, 2] Examples of such observables are measurements of jet mass [3, 4], various jet shapes [5], jet fragmentation [6, 7, 8, 9], and jet splitting functions [10].
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