Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2011-02-10
Physics
High Energy Physics
High Energy Physics - Experiment
4 pages, 4 figures, ICPAQGP-2010 Conference Proceedings
Scientific paper
Comparing the measurements of the hadronic final state from partonic showers in proton-proton and heavy-ion collisions will reveal the modifications generated by the medium on partons produced in hard scatterings. This can be achieved by selecting the hard processes in which there is a direct photon in the final state. The experimental technique consists in tagging events with a well identified high energy direct photon and in measuring the azimuthal angle correlation with charged hadrons. To establish a reference measurement for heavy-ion collisions, proton-proton collision data collected with ALICE have been analyzed. Preliminary results are presented together with photon and $\pi^{0}$-charged hadrons correlations showing the characteristic di-jet pattern from where the partonic momentum $k_{T}$ is extracted.
for the ALICE Collaboration
Mao Yaxian
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