155 research outputs found
Multiparton Tomography of Hot and Cold Nuclear Matter
Multiple parton interactions in relativistic heavy ion reactions result in
transverse momentum diffusion and medium induced non-Abelian energy loss of the
hard probes traversing cold and hot nuclear matter. A systematic study of the
interplay of nuclear effects on the GeV inclusive hadron spectra
demonstrates that the competition between nuclear shadowing, multiple
scattering and jet quenching leads to distinctly different
enhancement/suppression of moderate and high- hadron production in
and collisions at RHIC. The associated increase of di-jet acoplanarity,
measured via the broadening of the back-to-back di-hadron correlation function,
provides an additional experimental tool to test the difference in the
dynamical properties of the media created in such reactions.Comment: Prepared for the CIPANP 2003 conference proceedings. 4 pages, 4
figure
Testing the mechanism of QGP-induced energy loss
We present an analytic model of jet quenching, based on the (D)GLV energy
loss formalism, to describe the system size dependence of QGP-induced parton
absorption in relativistic heavy ion collisions. Numerical simulations of the
transverse momentum dependence of jet quenching are given for central Au+Au and
Cu+Cu reactions. Low pT dijet correlations are shown to be sensitive to the
reappearance of the lost energy as soft hadrons. At high pT we find that the
attenuation of dihadrons is similar to that of single inclusive particles.
Comparison to recent data from PHENIX and STAR is given as test of the jet
quenching theory.Comment: Poster proceedings for Quark Matter 2005. As published in Heavy Ion
Physics, 5 pages, 3 figure
Vector boson tagged jets and jet substructure
In these proceedings, we report on recent results related to vector
boson-tagged jet production in heavy ion collisions and the related
modification of jet substructure, such as jet shapes and jet momentum sharing
distributions. -tagging and -tagging of jets provides new
opportunities to study parton shower formation and propagation in the
quark-gluon plasma and has been argued to provide tight constrains on the
energy loss of reconstructed jets. We present theoretical predictions for
isolated photon-tagged and electroweak boson-tagged jet production in Pb+Pb
collisions at TeV at the LHC, addressing the
modification of their transverse momentum and transverse momentum imbalance
distributions. Comparison to recent ATLAS and CMS experimental measurements is
performed that can shed light on the medium-induced radiative corrections and
energy dissipation due to collisional processes of predominantly
quark-initiated jets. The modification of parton splitting functions in the QGP
further implies that the substructure of jets in heavy ion collisions may
differ significantly from the corresponding substructure in proton-proton
collisions. Two such observables and the implication of tagging on their
evaluation is also discussed.Comment: Proceedings of the XLVII International Symposium on Multiparticle
Dynamics; 9 pages, 9 eps figure
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