Speaker
Filip Krizek
(Acad. of Sciences of the Czech Rep. (CZ))
Description
Jets provide unique probes of the medium created in ultra-relativistic heavy-ion collisions.
Here, the observed jet quenching phenomena in central collisions prove that jets are sensitive
to interesting properties of strongly-coupled matter.
In addition, jet production in elementary processes, such as pp collisions, is well understood within the framework
of perturbative QCD, providing a rigorous theoretical basis for jet quenching calculations.
In the talk we will report the measurement of semi-inclusive p_{T} spectra of charged particle jets
that recoil from a high-p_{T} hadron trigger in Pb--Pb and pp collisions at \sqrt{s_{NN}} = 2.76 TeV and \sqrt{s} = 7 TeV,
respectively. In this analysis, the copious yield of uncorrelated trigger hadron-jet matchings
in central Pb+Pb collisions is removed by calculating the difference between two spectra corresponding
to disjoint trigger hadron p_{T} ranges. This procedure does not impose any fragmentation bias on the recoil jet population,
which is therefore collinear and infrared safe. The resulting distributions obtained for different values of jet
resolution parameter are used to study the modification of jet structure in the medium.
The results will be compared with calculations based on PYTHIA and JEWEL.
Author
Filip Krizek
(Acad. of Sciences of the Czech Rep. (CZ))
