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Charged-particle spectra obtained in Pb+Pb interactions at [arrow]"NN = 2.76 TeV and pp interactions at [arrow]"NN = 2.76 TeV with the ATLAS detector at the LHC are presented, using data with integrated luminosities of 0.15 nb-1 and 4.2 pb-1, respectively, in a wide transverse momentum (0.5
Charged-particle spectra obtained in Pb+Pb interactions at \(\sqrt{s_{\mathrm{NN}}}=2.76 \) TeV and pp interactions at \(\sqrt{s_{\mathrm{NN}}}=2.76 \) TeV with the ATLAS detector at the LHC are presented, using data with integrated luminosities of 0.15 nb−1 and 4.2 pb−1, respectively, in a wide transverse momentum (0.5
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at [arrow]"NN = 5.02 TeV in the range 0.4
Transverse momentum spectra of charged particles are measured by the CMS experiment at the CERN LHC in pPb collisions at [arrow]"NN = 5.02 TeV, in the range 0.4
Charged-particle spectra at midrapidity are measured in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair √sNN = 5.02 TeV and presented in centrality classes ranging from most central (0-5%) to most peripheral (95-100%) collisions. Possible medium effects are quantified using the nuclear modification factor (RAA) by comparing the measured spectra with those from proton-proton collisions, scaled by the number of independent nucleon-nucleon collisions obtained from a Glauber model. At large transverse momenta (8
This thesis offers an excellent, comprehensive introduction to the physics of the quark–gluon plasma. It clearly explains the connection between theory and experiment, making the topic accessible to non-specialists in this field. The experimental work, which contributes significantly to our understanding of the quark–gluon plasma, is described in great detail. The results described in the final chapters of the thesis provide interesting new ideas about the connection between proton-proton and Pb-Pb collisions. Simone Schuchmann received the 'ALICE Thesis Award 2016' for this excellent work.
The phenomenology of the strong nuclear force is still not well understood at low momentum transfers and requires experimental input to constrain. Collisions of heavy ions at the Large Hadron Collider provide a unique opportunity to explore this kinematic region because they create a novel form of matter: the quark-gluon plasma (QGP). Using the CMS detector, spectra of charged particles originating from protonproton (pp), proton-lead (pPb), and lead-lead (PbPb) collisions at a center of mass energy per nucleon pair ( [square root of SNN) of 5.02 TeV are examined as a function of transverse momentum and centrality. Nuclear modification factors and fragmentation functions are constructed from these spectra. By comparing to pp collision reference spectra, a puzzle concerning previous measurements in pPb collisions is clarified. A strong suppression of particle production observed in PbPb collisions is also quantified. Finally, collisions of xenon nuclei are also studied to constrain the path length dependence of parton energy loss. The strength of energy loss is found to increase with both [square root of SNN and the average path length through the QGP. Comparisons to theoretical models and previous measurements indicate that the path length dependence is between linear and quadratic, as expected from a combination of collisional and radiative energy loss mechanisms.