Speaker
Redmer Alexander Bertens
(Nikhef National institute for subatomic physics (NL))
Description
Jets in heavy-ion collisions are used to probe the QGP, as medium-induced parton energy loss from elastic and radiative interactions between partons and the QCD medium will lead to a modification of the measured jet spectrum. The dependence of the energy loss on the in-medium path length provides deeper insight into the energy loss mechanisms and can be studied by measuring jet production relative to the event plane orientation.
This contribution will show results of measurements of $R=0.2$ charged jet production in central and peripheral $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV Pb--Pb collisions with respect to the second order event plane, quantified as $v_2^{\mathrm{jet}}$. Jet finding is performed with the anti-$k_{\mathrm{T}}$ algorithm using charged tracks from the ALICE tracking system. The contribution of hydrodynamic flow to the underlying event energy is taken into account event-by-event; remaining fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations separately.
Significant non-zero $v_2^{\mathrm{jet}}$ is observed for peripheral collsions for 20 $<$ $p_{\mathrm{T}}$ $<$ 100 GeV/$c$; in central collisions this effect is less pronounced. Comparisons to $v_2$ of charged particles at high momenta and azimuthally dependent jet production studies of ATLAS are given, as well as $v_2^{\mathrm{jet}}$ predictions from the JEWEL Monte Carlo, which simulates parton shower evolution in the presence of a dense QCD medium.
| On behalf of collaboration: | ALICE |
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Primary author
Redmer Alexander Bertens
(Nikhef National institute for subatomic physics (NL))
