28 research outputs found

    Centrality Dependence Of The Pseudorapidity Density Distribution For Charged Particles In Pb-pb Collisions At √snn=2.76tev

    Get PDF
    7264/Mai61062

    Long-range Angular Correlations On The Near And Away Side In P-pb Collisions At √snn=5.02 Tev

    Get PDF
    7191/Mar294

    Neutron emission from electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV measured with the ALICE ZDC

    Get PDF
    The ALICE Zero Degree Calorimeter system (ZDC) is composed of two identical sets of calorimeters, placed at opposite sides with respect to the interaction point, 114 meters away from it, complemented by two small forward electromagnetic calorimeters (ZEM). Each set of detectors consists of a neutron (ZN) and a proton (ZP) ZDC. They are placed at zero degrees with respect to the LHC axis and allow to detect particles emitted close to beam direction, in particular neutrons and protons emerging from hadronic heavy-ion collisions (spectator nucleons) and those emitted from electromagnetic processes. For neutrons emitted by these two processes, the ZN calorimeters have nearly 100% acceptance. During the √ sNN = 2.76 TeV Pb-Pb data-taking, the ALICE Collaboration studied forward neutron emission with a dedicated trigger, requiring a minimum energy deposition in at least one of the two ZN. By exploiting also the information of the two ZEM calorimeters it has been possible to separate the contributions of electromagnetic and hadronic processes and to study single neutron vs. multiple neutron emission. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV, with neutron emission, are σ single EMD = 187:4 ± 0.2 (stat.)-11.2 +13.2 (syst.) b and σmutual EMD = 5.7 ± 0.1 (stat.) ±0.4 (syst.) b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model'701st International Conference on New Frontiers in Physics, ICFP 20122012-06-10Kolymbari, Crete; Greecesem informaçã

    Centrality Dependence Of The Charged-particle Multiplicity Density At Midrapidity In Pb-pb Collisions At √snn=2.76tev

    No full text
    106

    Measurement Of The Cross Section For Electromagnetic Dissociation With Neutron Emission In Pb-pb Collisions At √snn=2.76 Tev

    No full text
    1092

    Measurement of charm production at central rapidity in proton-proton collisions at s\sqrt{s} = 7 TeV

    No full text
    The pt-differential inclusive production cross sections of the prompt charmed mesons D0, D+, and D*+ in the rapidity range |y|K-pi+, D+->K-pi+pi+, D*+->D0pi+, and their charge conjugates, about 8,400 D0, 2,900 D+, and 2,600 D*+ mesons with 1<pt<24 GeV/c were counted, after selection cuts, in a data sample of 3.14x10^8 events collected with a minimum-bias trigger (integrated luminosity L_int = 5/nb). The results are described within uncertainties by predictions based on perturbative QCD.The pTp_{\rm T}-differential inclusive production cross sections of the prompt charmed mesons D0D^0, D+D^+, and D+D^{*+} in the rapidity range |y|<0.5 were measured in proton-proton collisions at s=7\sqrt{s} = 7 TeV at the LHC using the ALICE detector. Reconstructing the decays D0Kπ+D^0\rightarrow K^-\pi^+, D+Kπ+π+D^+\rightarrow K^-\pi^+\pi^+, D+D0π+D^{*+}\rightarrow D^0\pi^+, and their charge conjugates, about 8,400 D0D^0, 2,900 D+D^+, and 2,600 D+D^{*+} mesons with 1<pTp_{\rm T}<24 GeV/cc were counted, after selection cuts, in a data sample of 3.14x108^8 events collected with a minimum-bias trigger (integrated luminosity LintL_{\rm int} = 5/nb). The results are described within uncertainties by predictions based on perturbative QCD

    Centrality Dependence Of π, K, And P Production In Pb-pb Collisions At √snn=2.76 Tev

    No full text
    88

    Underlying Event Measurements In Pp Collisions At √s = 0:9 And 7 Tev With The Alice Experiment At The Lhc

    No full text
    2012
    corecore