Abstract
The measurement of J/ψ production in heavy-ion collisions is seen as a keymeasurement in the hunt for the Quark-Gluon Plasma. At high collision energiesas reached at the LHC it was predicted that a significant fraction of the J/ψyield is formed by (re)combination of deconfined charm and anticharm quarks inthe medium or at the phase boundary. This mechanism is expected to be mostimportant at very low transverse momentum.In this thesis the production of J/ψ mesons is studied at mid-rapidity (|y| < 0.9) in pp and Pb–Pb collisions at a collision energy of √s_NN = 5.02 TeV with ALICE.The J/ψ mesons are reconstructed in the e+e− decay channel down to vanishingtransverse momentum (pT = 0). The electrons and positrons are identified usingthe specific energy loss dE/dx in the TPC. The J/ψ spectrum and the nuclearmodification factor R_AA in most central collisions are consistent with modelswhich include (re)combination as a dominant source of J/ψ production. Themeasurement of the first two moments of the pT distribution as a function ofcentrality shows that this mechanism becomes more important for more centralcollisions.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.