Speaker
Xiangrong Zhu
(Central China Normal University CCNU (CN))
Description
Correlations between high-$p_{\rm T}$ photons or leading hadrons and charged
hadrons are considered as a sensitive probe for studying medium-induced
parton energy loss and jet modification in heavy-ion collisions.
The prompt photons are produced in association with jets in pp and Pb-Pb
collisions. Such processes can be tagged experimentally via photon
isolation analysis and the correlation of such photons with hadrons in
the opposite side in azimuth. Prompt photons energy is close to the
energy of the parton at the origin of the jet in the opposite side and
thus the correlation with the hadrons allows a measurement of the jet
fragmentation.
Neutral mesons production at high $p_{\rm T}$ is also modified in Pb-Pb
collisions due to the same parton energy loss mechanism. In addition,
the jet fragments in the meson direction, and the opposite jet in
azimuth, are also quenched in the medium. Therefore, the charged
particles yield associated with the high-$p_{\rm T}$ neutral meson is modified
in Pb-Pb collisions compared to the pp reference at the same colliding
energy.
The ALICE experiment at the LHC performs measurements of the azimuthal
correlation between neutral pions or isolated photons triggered by the
electromagnetic calorimeter EMCAL, and charged hadrons detected in the
central tracker. Results of $\pi^0$-hadron correlations measurements
in pp and Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV as well as jet
fragmentation tagged by isolated photons in pp collisions at
$\sqrt{s}$ = 7 TeV, will be presented.
| On behalf of collaboration: | ALICE |
|---|
Primary author
Xiangrong Zhu
(Central China Normal University CCNU (CN))
