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Evolution of the Jet Opening Angle Distribution in Holographic Plasma
Krishna Rajagopal1, Andrey V Sadofyev1, Wilke van der Schee1
1Center for Theoretical Physics, MIT, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|June 11, 2016
Summary
Jets widen but lose energy in plasma. Wider jets lose more energy, causing them to be filtered out. This can lead to narrower jets emerging from the plasma than expected in vacuum.
Area of Science:
- High-energy particle physics
- Quantum chromodynamics
- Heavy ion collisions
Background:
- Jets are crucial probes of the quark-gluon plasma.
- Understanding jet evolution in plasma is key to understanding plasma properties.
Purpose of the Study:
- To analyze jet evolution in an expanding, cooling quark-gluon plasma.
- To investigate the interplay between jet widening and energy loss.
Main Methods:
- Holography used to model jet propagation.
- Initial conditions based on proton-proton collisions.
- Plasma modeled as an expanding, cooling droplet.
Main Results:
- Individual jets widen as they traverse the plasma.
- Wide-angle jets experience greater energy loss.
- Energy loss filters out wide-angle jets from the ensemble.
- Observed narrowing of jets compared to vacuum predictions.
Conclusions:
- Jet widening and energy loss have competing effects on jet ensembles.
- The filtering effect can lead to a smaller mean jet opening angle post-plasma traversal.
- Results align with experimental observations suggesting jet narrowing.
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