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CERN Heavy Ion Forum
Jet physics in heavy-ion collisions
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Europe/Zurich
TH Theory Conference Room (CERN)
TH Theory Conference Room
CERN
Description
1. Jets and PDFs at the LHC heavy-ion collisions
by Carlos Albert Salgado Lopez (Santiago de Compostela)
RHIC experiments have established jet quenching as a fundamental tool in the study of hot matter in heavy-ion collisions. The energy reached is enough for high-pt inclusive particle studies and two- or three-particle correlations. The main qualitative improvement of these studies at the LHC will be the possibility to study reconstructed jets and their corresponding medium-induced modification of their properties. The theoretical implementation of the effects, very successful for the inclusive quantities at RHIC, need to be improved to describe these less inclusive observables. I will review the recent proposals in this direction and, in particular, our own implementation of medium-effects in the parton shower of Monte Carlo codes as PYTHIA and HERWIG. On the other hand, a good knowledge of the nuclear PDFs is essential for the phenomenology of jet quenching and other hard probes. A brief review of the latest global fits will be presented.
2. Jet physics in heavy-ion collisions with the CMS detector
by Constantinos Loizides (MIT)
At RHIC, hard probes and in particular jets have been a useful tool to probe the properties of the hot, dense matter created. At the LHC, with $\sqrt{s_{\rm NN}}=5.5$~TeV available, the cross sections for rare probes increase dramatically. The CMS detector will collect large event samples, thanks to the large geometrical coverage of the electromagnetic and hadronic calorimeters (over $-3<\eta<3$) and of the charged-particle tracking (over $-2.5<\eta<2.5$), both fully covering the azimuthal angle. Equally important is the capacity of the DAQ and HLT systems to inspect all Pb+Pb collisions, giving priority to the storage of rare events. The expected statistics will allow us to study jets of transverse energies far beyond 100~GeV. In this talk, simulations of the capabilities of the CMS experiment to measure jets in heavy ion collisions are presented. In particular, the $\gamma$-jet channel is promising since the direct photon which is used to tag the properties of the away-side jet is not affected by the presence of the medium, contrary the case of di-jet production.
More information
by Carlos Albert Salgado Lopez (Santiago de Compostela)
RHIC experiments have established jet quenching as a fundamental tool in the study of hot matter in heavy-ion collisions. The energy reached is enough for high-pt inclusive particle studies and two- or three-particle correlations. The main qualitative improvement of these studies at the LHC will be the possibility to study reconstructed jets and their corresponding medium-induced modification of their properties. The theoretical implementation of the effects, very successful for the inclusive quantities at RHIC, need to be improved to describe these less inclusive observables. I will review the recent proposals in this direction and, in particular, our own implementation of medium-effects in the parton shower of Monte Carlo codes as PYTHIA and HERWIG. On the other hand, a good knowledge of the nuclear PDFs is essential for the phenomenology of jet quenching and other hard probes. A brief review of the latest global fits will be presented.
2. Jet physics in heavy-ion collisions with the CMS detector
by Constantinos Loizides (MIT)
At RHIC, hard probes and in particular jets have been a useful tool to probe the properties of the hot, dense matter created. At the LHC, with $\sqrt{s_{\rm NN}}=5.5$~TeV available, the cross sections for rare probes increase dramatically. The CMS detector will collect large event samples, thanks to the large geometrical coverage of the electromagnetic and hadronic calorimeters (over $-3<\eta<3$) and of the charged-particle tracking (over $-2.5<\eta<2.5$), both fully covering the azimuthal angle. Equally important is the capacity of the DAQ and HLT systems to inspect all Pb+Pb collisions, giving priority to the storage of rare events. The expected statistics will allow us to study jets of transverse energies far beyond 100~GeV. In this talk, simulations of the capabilities of the CMS experiment to measure jets in heavy ion collisions are presented. In particular, the $\gamma$-jet channel is promising since the direct photon which is used to tag the properties of the away-side jet is not affected by the presence of the medium, contrary the case of di-jet production.
More information
Organised by
Yiota Foka, Urs Wiedemann