9 research outputs found

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

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    7191/Mar294

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

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    2012

    ALICE Electromagnetic Calorimeter Technical Design Report

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    The ALICE Electromagnetic Calorimeter technical design is reported

    Azimuthal correlations of heavy-flavor hadron decay electrons with charged particles in pp and p–Pb collisions at sNN\pmb {\sqrt{s_{\mathrm{{NN}}}}} = 5.02 TeV

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    International audienceThe azimuthal (Δφ\Delta \varphi ) correlation distributions between heavy-flavor decay electrons and associated charged particles are measured in pp and p–Pb collisions at sNN=5.02\sqrt{s_{\mathrm{{NN}}}} = 5.02 TeV. Results are reported for electrons with transverse momentum 4<pT<16GeV/c4<p_{\textrm{T}}<16\textrm{GeV}/c and pseudorapidity η<0.6|\eta |<0.6. The associated charged particles are selected with transverse momentum 1<pT<7GeV/c1<p_{\textrm{T}}<7\textrm{GeV}/c, and relative pseudorapidity separation with the leading electron Δη<1|\Delta \eta | < 1. The correlation measurements are performed to study and characterize the fragmentation and hadronization of heavy quarks. The correlation structures are fitted with a constant and two von Mises functions to obtain the baseline and the near- and away-side peaks, respectively. The results from p–Pb collisions are compared with those from pp collisions to study the effects of cold nuclear matter. In the measured trigger electron and associated particle kinematic regions, the two collision systems give consistent results. The Δφ\Delta \varphi distribution and the peak observables in pp and p–Pb collisions are compared with calculations from various Monte Carlo event generators

    Measurement of the non-prompt D-meson fraction as a function of multiplicity in proton-proton collisions at s \sqrt{s} = 13 TeV

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    International audienceThe fractions of non-prompt (i.e. originating from beauty-hadron decays) D0^{0} and D+^{+} mesons with respect to the inclusive yield are measured as a function of the charged-particle multiplicity in proton-proton collisions at a centre-of-mass energy of s \sqrt{s} = 13 TeV with the ALICE detector at the LHC. The results are reported in intervals of transverse momentum (pT_{T}) and integrated in the range 1 < pT_{T}< 24 GeV/c. The fraction of non-prompt D0^{0} and D+^{+} mesons is found to increase slightly as a function of pT_{T} in all the measured multiplicity intervals, while no significant dependence on the charged-particle multiplicity is observed. In order to investigate the production and hadronisation mechanisms of charm and beauty quarks, the results are compared to PYTHIA 8 as well as EPOS 3 and EPOS 4 Monte Carlo simulations, and to calculations based on the colour glass condensate including three-pomeron fusion.[graphic not available: see fulltext

    Transverse momentum spectra of charged particles in proton-proton collisions at 1as=900 GeV with ALICE at the LHC

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    The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at s=900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|\u3b7|<0.8) over the transverse momentum range 0.15<10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |\u3b7|<0.8 is \u3008pT\u3009INEL=0.483\ub10.001 (stat.)\ub10.007 (syst.) GeV/c and \u3008pT\u3009NSD=0.489\ub10.001 (stat.)\ub10.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger \u3008pT\u3009 than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET. \ua9 2010

    ALICE upgrades during the LHC Long Shutdown 2

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    International audienceA Large Ion Collider Experiment (ALICE) has been conceived and constructed as a heavy-ion experiment at the LHC. During LHC Runs 1 and 2, it has produced a wide range of physics results using all collision systems available at the LHC. In order to best exploit new physics opportunities opening up with the upgraded LHC and new detector technologies, the experiment has undergone a major upgrade during the LHC Long Shutdown 2 (2019–2022). This comprises the move to continuous readout, the complete overhaul of core detectors, as well as a new online event processing farm with a redesigned online-offline software framework. These improvements will allow to record Pb-Pb collisions at rates up to 50 kHz, while ensuring sensitivity for signals without a triggerable signature
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