22-29 July 2015
Europe/Vienna timezone

Jet results in heavy ion collisions with the ATLAS experiment at the LHC

23 Jul 2015, 14:50
25m
HS42 ()

HS42

talk Heavy Ion Physics Heavy Ion Physics

Speaker

Dennis Vadimovich Perepelitsa (Brookhaven National Laboratory (US))

Description

In relativistic collisions of heavy ions, a hot medium with a high density of unscreened color charges is produced, and jets propagating through this medium are known to suffer energy loss. This results in several distinct effects seen in central heavy ion collisions: the yield of inclusive jets measured via the nuclear modification factor is observed to be strongly suppressed; the yield of events with highly asymmetric dijet pairs is observed to be increased; the jet fragmentation is modified. In proton-lead collisions, the production of hard processes is expected to be modified via a modification of nuclear parton distribution functions. While the theory predicts rather small effects to be observed, the data show interesting unexpected features: the nuclear modification factor exhibits a strong centrality dependence; charged particle spectra show an enhancement at large transverse momenta with respect to the proton-proton reference. In this talk, we will summarize the most recent results by ATLAS involving these striking phenomena.

additional information

Submitted on behalf of the ATLAS Heavy Ion Physics Group by the ATLAS Speakers Committee representative Alex Read (a.l.read@fys.uio.no). Alex is NOT the speaker!

Primary author

Dennis Vadimovich Perepelitsa (Brookhaven National Laboratory (US))

Presentation Materials