Measurements of azimuthal correlation between jets and charged particles at LHC-ALICE experiment

In the nature around us, quarks and gluons are confined in hadrons due to "confinement of quarks". However, the coupling strength of the QCD between quarks and gluons is to be asymptotically weaker with the increasing their energy. At high temperature the quarks and gluons move freely beyond the boundary of hadrons. Such high energy state is called Quark-Gluon Plasma(QGP). To create such state on the earth, the ultra relativistic heavy ion collision is unique tool. It has been observed several signatures of the QGP formation at the Relativistic Heavy Ion Collider(RHIC). Suppression of high momentum particles is one of the signatures. High momentum particles are known to be produced in characteristic phenomena, jet , where high momentum particle are produced in cluster. The jet is produced when parton in each projectile is scattered with large momentum, followed by fragmentation into many hadrons. It is considered that the cause of the suppression of high momentum particle is due to the characteristic energy loss of the parton in the QGP. On the other hands, many low momentum particles are formed at characteristic energy loss and the additional instead large angles from original low momentum particles is often called modification of jet. In theoretical approach, the energy loss and the shape modification of the jet is strongly relate to properties of hot/dense matter particularly gluon density and initial temperature of the QGP. Therefore study of jet modification is a good tool to investigate the properties of the QGP. Experimentally it is very important to measure the energy loss together with the energy re-distribution at large angles. At the RHIC, it is difficult to collect enough data because of its low rate. The production cross-section of jet is strongly related to the collision energy. The Large Hadron Collider(LHC) starts nuclear-nuclear collisions with highest energy from 2010. LHC provides good opportunity to study the jet physics in heavy ion collisions to investigate parton interaction between jets and the QGP with higher statistics. Former study of the jet physics in heavy ion collisions has been done at the LHC by CMS. They have suggested the existence of re-distributed particles at large angles. In their study, the information of the spread angle is minimum and they can not see detail of jet modification. In this paper, a new analysis method is proposed in order to see the modified energy(or momentum) with the spread angle. Proposed new method handles the momentum weighted azimuthal distribution of the associate particles with respect to the leading jet and direct comparison of pp and Pb-Pb collisions have been done. In this thesis, the centrality dependence and the leading jet momentum dependence are shown to extract jet modification effects, which shed light on the knowledge of the pass length dependence of jet modification. We observe that the low momentum particles are re-distributed at large angles in the away-side of the jet with respect to the leading jet. This feature is consistent with CMS results. Furthermore we see the re-distributed momentum in the near-side. The missing momentum and the re-distributed momentum is found to be almost balanced. We see jet modification is larger with the highest jet momentum, and the effect is also larger in the central compared with peripheral collisions.