Abstract
The Quark Gluon Plasma (QGP) is created in high energy heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This medium is transparent to electromagnetic probes but nearly opaque to colored probes. Hard partons produced early in the collision fragment and hadronize into a collimated spray of particles called a jet. The partons lose energy as they traverse the medium, a process called jet quenching. Most of the lost energy is still correlated with the parent parton, contributing to particle production at larger angles and lower momenta relative to the parent parton than in proton-proton collisions. This partonic energy loss can be measured through several observables, each of which give different insights into the degree and mechanism of energy loss. The measurements to date are summarized and the path forward is discussed.
Highlights
A hot, dense liquid of quarks and gluons called the Quark Gluon Plasma (QGP) is formed when heavy ions collide at relativistic speeds
In high energy collisions where a QGP is not formed, such as p+p collisions, these hard scattered partons will fragment into a collimated spray of particles called a jet
Jets are used to measure partonic energy loss, a process which can lead to constraints on the properties of the QGP
Summary
A hot, dense liquid of quarks and gluons called the Quark Gluon Plasma (QGP) is formed when heavy ions collide at relativistic speeds. Partons traversing a QGP can lose energy either radiatively or through collisions with medium partons These interactions lead to jets which are broader on average than those in p+p collisions, with fewer particles carrying a large fraction of the jet’s energy, z = pT /E jet, and more particles at lower z. This picture of partonic energy loss, concurrent with broadening of the jet and softening of the fragmentation function, has been qualitatively confirmed by several measurements [1]. The background in heavy ion collisions is very large and the experimental techniques may lead to a number of biases in the results
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