Conveners
Jets
- David d'Enterria (CERN)
Marguerite Belt Tonjes
(University of Maryland)
5/24/11, 3:00 PM
Jets
Parallel
Jets are an important tool to probe the hot, dense medium that is produced in ultra-relativistic heavy ion collisions. The large collision energy at the LHC provides copious production of dijets with energies that can be cleanly identified above the heavy ion background. The multipurpose Compact Muon Solenoid (CMS) detector is well designed to measure these hard scattering processes with its...
Aaron Richard Angerami
(Columbia University)
5/24/11, 3:20 PM
Jets
Parallel
Jet quenching, the parton energy loss in the hot and dense medium created in ultra-relativistic heavy ion collisions, is a well-established experimental phenomenon at RHIC. However, existing single hadron, di-hadron and multi-hadron measurements from RHIC do not provide a complete understanding of the experimental results and do not sufficiently constrain theoretical models. Reconstructed jet...
Dr
José Guilherme Milhano
(Instituto Superior Tecnico (IST) and CERN PH-TH)
5/24/11, 3:40 PM
Jets
Parallel
The ATLAS and CMS Collaborations recently reported strong modifications of dijet properties in heavy ion collisions. In this work, we discuss the extent to which these first data constrain the microscopic mechanism underlying jet quenching. Simple kinematic arguments lead us to identify a frequency collimation mechanism via which the medium efficiently trims away the soft components of the jet...
Dr
Ivan Vitev
(Los Alamos National Laboratory)
5/24/11, 4:00 PM
Jets
Parallel
Jets physics is an important new area of active research at RHIC and at the LHC that paves the way for novel tests of QCD multi-parton dynamics in heavy-ion reactions. At present, perturbative QCD calculations of hard probes in “elementary” nucleon-nucleon reactions can be consistently combined with the effects of the nuclear medium up to next-to-leading order. While such accuracy is desirable...
Dr
Christian Klein-Boesing
(IKP Muenster)
5/24/11, 4:20 PM
Jets
Parallel
The quantification of the effect of parton energy loss, known as jet
quenching, is one of the major goals of jet and high $p_T$
measurements in heavy-ion collisions. Here, the aim of the reconstruction of
jets, as compared to single particle measurements, is to provide a more direct
access to the original parton properties and the modification of the
fragmentation process in heavy-ion...
Thorsten Renk
(University of Jyväskylä)
5/24/11, 4:40 PM
Jets
Parallel
Despite a wealth of experimental data for high p_T processes in heavy-ion collisions, discriminating between different models of hard parton-medium interactions has been difficult. A large reason is that the pQCD parton spectrum at RHIC is so steeply falling that distinguishing even a moderate shift in parton energy from complete parton absorption is essentially impossible. In essence, energy...
Dr
Nathan Grau
(Augustana College)
5/24/11, 5:00 PM
Jets
Parallel
Fully reconstructed jets and hadrons correlated with a direct photon significantly reduce energy-loss bias, the bias toward measuring particles from partons which suffer little energy loss. In d+Au collisions, one accesses the physics at large $x$, which yields important constraints for nuclear parton distribution functions. In both d+Au and A+A collisions, coherent multiple-scattering models...
