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CERN
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Description
The new era of the Large Hadron Collider (LHC) in heavy-ion experiments has
come up. It opens the chance to probe physics in new regime of center of mass
energy 14 times larger than previous experiment, which is performed by the
Relativistic Heavy Ion Collider (RHIC). Thanks to such a high center of mass
energy available at the LHC, the dimuon analysis can reach up to high mass
region such as W± and Z0 bosons in the heavy-ion collisions. This measurement
during November and December in 2010 was the first trial to observe the Z0
bosons in the history of heavy-ion experiments. The study of Z0 and J/ψ
production is very important to understand modifications in the
Quark-Gluon-Plasma (QGP). Z0 bosons are expected to be un-modified by the
presence of the QGP. On the other hand, J/ψs are expected to be modified by
QGP. Therefore, we measured the comparison of the results of the nuclear
modification factor (RAA), which is the ratio of the yields normalized by pp
cross section scaled by binary collisions, rises the attention of the fans who
love dimuon physics in heavy-ion and will be shown in this thesis. The analysis
is performed with the data which were taken in pp and PbPb colli- sions at √sNN
= 2.76 TeV with 7.2 μb−1.
