Production Of Light Nuclei And Anti Nuclei In Math Mrow Mi P Mi Mi P Mi Mrow Math And Pb Pb Collisions At Energies Available At The Cern Large Hadron Collider
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Production of Light Nuclei and Anti-nuclei in [math][mrow][mi]p[/mi][mi]p[/mi][/mrow][/math] and Pb-Pb Collisions at Energies Available at the CERN Large Hadron Collider
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The production of (anti-)deuteron and (anti-) 3He nuclei in Pb-Pb collisions at √sNN = 2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The particle ratios, 3He /d and 3He /p, in Pb-Pb collisions are found to be in agreement with a common chemical freeze-out temperature of Tchem ≈ 156 MeV. These ratios do not vary with centrality which is in agreement with the thermal-statistical model. In a coalescence approach, it excludes models in which nucleus production is proportional to the particle multiplicity and favors those in which it is proportional to the particle density instead. In addition, the observation of 31 anti-tritons in Pb-Pb collisions is reported. For comparison, the deuteron spectrum in pp collisions at √s = 7 TeV is also presented. While the p/[pi] ratio is similar in pp and Pb-Pb collisions, the d/p ratio in pp collisions is found to be lower by a factor of 2.2 than in Pb-Pb collisions.
Centrality, Rapidity, and Transverse Momentum Dependence of Isolated Prompt Photon Production in Lead-lead Collisions at [math][mrow][msqrt][msub][mi][/mi][mrow][mi]N[/mi][mi]N[/mi][/mrow][/msub][/msqrt][mo]
In this study, prompt photon production in √sNN = 2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb-1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals,
J/[psi] Production and Nuclear Effects in P-Pb Collisions at $ \sqrt{{{{\mathrm{s}}_{\mathrm{NN}}}}} $
We studied inclusive J/[psi] production with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy √sNN = 5.02 TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains 2.03