Measurement of transverse momentum jet spectra in Pb-Pb collsions at $\sqrt{\rm s_{NN}}$ = 2.76 TeV using calorimeter triggers with the ALICE detector

20 May 2014, 16:30
spectrum (darmstadtium)



Board: E-27
Poster Jets Poster session


Rosi Jan Reed (Yale University (US))


In relativistic heavy-ion collisions a hot, dense medium of strongly interacting matter called the Quark-Gluon Plasma (QGP) is formed. It has been determined that jets of hadrons, created from the fragmentation of hard-scattered partons, are suppressed relative to measurements from proton-proton collisions. This jet quenching effect in both strong and weak coupling calculations explicitly depends on the path-length of the parton through the medium. Jets can be reconstructed in the ALICE detector from the tracking systems alone, creating charged jets, or from the combination of the tracking systems and the electromagnetic calorimeter (EMCal). The EMCal was used to trigger on events with a jet within its acceptance, which allows for a measurement of the jet spectra versus centrality and event plane by increasing the available statistics. The centrality and event plane of these events are reconstructed with the VZERO detectors to avoid autocorrelations with the triggered jets. Triggers introduce biases to both the fragmentation of the jets, and to the background. Centrality and event plane dependence of the measured spectra and the background using the EMCal trigger will be shown as well as the reconstruction and correction procedures with the trigger biases.
On behalf of collaboration: ALICE

Primary author

Rosi Jan Reed (Yale University (US))

Presentation Materials