Nuclear Physics Seminar


There and back again: The tale of Jet Production and Modification in pp, pA and AA collisions at RHIC and the LHC

Rosi Reed (Wayne State University)

November 19th, 2014, 1:45 pm

In relativistic heavy-ion collisions a hot, dense medium of strongly interacting matter called the Quark Gluon Plasma (QGP) is formed. In the initial stages of the heavy ion collision, there will be highly energetic collisions, which produce high pT quarks and gluons (partons), as well as heavy flavor quarks. These partons are good probes of the medium, as they sample the medium at all stages of its evolution and their production rate is calculable with perturbative Quantum-Chromodynamics (QCD). The high pT partons produced in these collisions will fragment and then hadronize into a column of particles, which we call a jet. One of the main goals of jet measurements is to understand how these hard scattered partons lose energy as they traverse through the colored medium. A study of jet spectra and correlations in a variety of collisional systems, both in terms of species and energy, will allow a better understanding of the detailed mechanisms of this in-medium energy loss, and can further constrain theoretical models as many of the key transport coefficients, such as qhat, run with both the energy density of the system and the momentum of the parton. In order to fully understand the modification of the parton fragmentation function in a heavy ion environment, it is important that the underlying event background and its fluctuations is well understood for all colliding systems. I will present recent RHIC and LHC results on jet production and single hadrons, which are a good proxy for jets, in pp, pA and AA collisions and discuss the current state of experimental jet measurements, and what we could learn from future measurements at both the LHC and RHIC.


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