Refine
Year of publication
Language
- English (312)
Has Fulltext
- yes (312)
Is part of the Bibliography
- no (312)
Keywords
- LHC (4)
- ALICE experiment (3)
- Hadron-Hadron Scattering (3)
- Heavy Ions (3)
- Beauty production (2)
- Charm physics (2)
- Pb–Pb collisions (2)
- Single electrons (2)
- pp collisions (2)
- ALICE detector (1)
- Anti-nuclei (1)
- Centrality Class (1)
- Centrality Selection (1)
- Electron-pion identification (1)
- Elliptic flow (1)
- Fibre/foam sandwich radiator (1)
- Heavy flavor production (1)
- Heavy ions (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion collision (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Jets (1)
- Minimum Bias (1)
- Monte Carlo (1)
- Multi-wire proportional drift chamber (1)
- Neural network (1)
- Production Cross Section (1)
- QCD (1)
- Quark gluon plasma (1)
- Rapidity Range (1)
- Relativistic heavy ion physics (1)
- Resolution Parameter (1)
- Systematic Uncertainty (1)
- TR (1)
- Time Projection Chamber (1)
- Tracking (1)
- Transition radiation detector (1)
- Trigger (1)
- Xenon-based gas mixture (1)
- dE/dx (1)
- heavy ion experiments (1)
- quark gluon plasma (1)
Institute
- Physik (312)
- Frankfurt Institute for Advanced Studies (FIAS) (291)
- Informatik (281)
- Hochschulrechenzentrum (2)
The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at √sNN=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15<pT<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.
The ALICE Collaboration has made the first measurement at the LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=2.76 TeV. The J/ψ is identified via its dimuon decay in the forward rapidity region with the muon spectrometer for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 55 μb−1. The cross section for coherent J/ψ production in the rapidity interval −3.6<y<−2.6 is measured to be dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst) mb. The result is compared to theoretical models for coherent J/ψ production and found to be in good agreement with those models which include nuclear gluon shadowing.