Production of nuclei and antinuclei in pp and Pb-Pb collisions with ALICE at the LHC

Abstract

We present first results on the production of nuclei and antinuclei such as (anti)deuterons, (anti)tritons, (anti)3He and (anti)4He in pp collisions at $\s$ = 7 TeV and Pb-Pb collisions at $\sNN$ = 2.76 TeV. These particles are identified using their energy loss (dE/dx) information in the Time Projection Chamber of the ALICE experiment. The Inner Tracking System gives a precise determination of the event vertex, by which primary and secondary particles are separated. The high statistics of over 360 million events for pp and 16 million events for Pb-Pb collisions give a significant number of light nuclei and antinuclei (Pb-Pb collisions: \sim30,000 anti-deuterons($\bar{d}$) and \sim4 anti-alpha($\overline{{}^{4}He}$)). The predictions of various particle ratios from the THERMUS model is also discussed.

4 pages, 5 figures, parallel talk at Quark Matter 2011, May 23rd-28th 2011, Annecy, France

References in corpus (2)

• Observation of the antimatter helium-4 nucleus
• Particle Identification in the ALICE Experiment

Cited by in corpus (14)

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• Light nuclei production in relativistic heavy ion collisions from the AMPT model
• Centrality dependence of light (anti)nuclei and (anti)hypertriton production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV
• Antimatter production in central Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$=200 GeV
• Energy dependence of light (anti)nuclei and (anti)hypertriton production in the Au-Au collision from $\sqrt{s_{\mathrm{NN}}}=5.0$ to $5020$ GeV
• Antimatter ${}_{\Lambda }^4$H Hypernucleus Production and the ${}_{\Lambda }^3$H/${}^3$He Puzzle in Relativistic Heavy-Ion Collisions
• A brief review of antimatter production
• Prospects of detecting dark matter through cosmic-ray antihelium with the antiproton constraints
• Properties of light (anti)nuclei and (anti) hypertriton production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Light (anti-)nuclei and (anti-)hypertriton production in $pp$ collisions at $\sqrt{s}=0.90,2.76$ and $7$ TeV