Abstract
The ALICE detector is dedicated to studying the properties of hot and dense matter created in heavy-ion collisions. Among the probes used to investigate these properties are high-momentum particles, which originate in hard-scatterings occurring before the fireball creation. The fragments of hard scatterings interact with the hot and dense matter and via this interaction their spectra and azimuthal distributions are modified. This is probed by the measurement of the nuclear modification factor, where the pT spectra obtained in Pb–Pb collisions are compared to a pp baseline. A strong suppression of charged hadrons as well as neutral- and heavy-flavor mesons was observed at pT > 4 GeV/c. Azimuthal correlations, using high-momentum (pT > 4 GeV/c) hadrons as triggers, can provide further insight into how the presence of the medium modifies the final kinematic distributions of the particles. Comparison with theoretical models can be used to test their predictions about the properties of the medium. We give an overview of ALICE azimuthal-correlation measurements of neutral- and heavy-flavor mesons with charged hadrons in pp collisions at and Pb–Pb collisions at . We also present a measurement of the π0 correlation with jets in pp collisions at .
Highlights
In the high-energy heavy-ion collisions the creation of a new state of matter is expected
Results and discussion we present our results on the angular correlation analyses using π0 and D mesons as triggers
Conclusions and final remarks We have presented an overview of the results on the correlation-measurements with π0 and D mesons as high-pT triggers
Summary
In the high-energy heavy-ion collisions the creation of a new state of matter is expected. Previous measurements showed a yield-suppression at high momenta for unidentified hadrons [9] as well as D mesons [10] and π0 [11] This suppression is generally understood as a manifestation of the energy loss the initial partons suffer when they traverse the QGP. Another observable, that complements the modification of the momentum spectrum is the per-trigger yield obtained from angular correlations:. Apart from the yield-modification, one can look at the changes in the shape of the angular distribution of the associated particles produced along the path of the trigger Such measurement targets the broadening and softening of the initial parton fragmentation and is done by measuring the widths of the near- and away-side peaks. The background is subtracted in the analysis of Pb–Pb data using both a flat and a flow assumption
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