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1.
  • A, Lebedev, et al. (författare)
  • Direct photons in WA98.
  • 2002
  • Ingår i: Nuclear Physics A. - Elsevier. ; 698, s. 135-135
  • Tidskriftsartikel (refereegranskat)
  •  
2.
  • Acharya, S, et al. (författare)
  • Linear and non-linear flow mode in Pb–Pb collisions at sNN=2.76 TeV
  • 2017
  • Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - Elsevier. - 0370-2693. ; 773, s. 68-80
  • Tidskriftsartikel (refereegranskat)abstract
    • The second and the third order anisotropic flow, V2 and V3, are mostly determined by the corresponding initial spatial anisotropy coefficients, ε2 and ε3, in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefficient, higher order anisotropic flow, Vn (n>3), can also have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this Letter we investigate the linear and non-linear modes in higher order anisotropic flow Vn for n=4, 5, 6 with the ALICE detector at the Large Hadron Collider. The measurements are done for particles in the pseudorapidity range |η|<0.8 and the transverse momentum range 0.2<pT<5.0 GeV/c as a function of collision centrality. The results are compared with theoretical calculations and provide important constraints on the initial conditions, including initial spatial geometry and its fluctuations, as well as the ratio of the shear viscosity to entropy density of the produced system. © 2017 The Author(s)
3.
  • Acharya, S, et al. (författare)
  • Measurement of D-meson production at mid-rapidity in pp collisions at √s=7 TeV
  • 2017
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 77:8
  • Tidskriftsartikel (refereegranskat)abstract
    • The production cross sections for prompt charmed mesons D 0, D +, D ∗ + and Ds+ were measured at mid-rapidity in proton–proton collisions at a centre-of-mass energy s=7TeV with the ALICE detector at the Large Hadron Collider (LHC). D mesons were reconstructed from their decays D 0→ K -π+, D +→ K -π+π+, D ∗ +→ D 0π+, Ds++→K-K+π+, and their charge conjugates.With respect to previous measurements in the same rapidity region, the coverage in transverse momentum (pT) is extended and the uncertainties are reduced by a factor of about two. The accuracy on the estimated total c c ¯ production cross section is likewise improved. The measured pT-differential cross sections are compared with the results of three perturbative QCD calculations. © 2017, CERN for the benefit of the ALICE collaboration.
4.
  • Acharya, S, et al. (författare)
  • Measurement of deuteron spectra and elliptic flow in Pb–Pb collisions at √sNN = 2.76 TeV at the LHC
  • 2017
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 77:10
  • Tidskriftsartikel (refereegranskat)abstract
    • The transverse momentum (pT) spectra and elliptic flow coefficient (v2) of deuterons and anti-deuterons at mid-rapidity (| y| < 0.5) are measured with the ALICE detector at the LHC in Pb–Pb collisions at sNN = 2.76 TeV. The measurement of the pTspectra of (anti-)deuterons is done up to 8 GeV/ c in 0–10% centrality class and up to 6 GeV/ c in 10–20% and 20–40% centrality classes. The v2is measured in the 0.8 < pT<5 GeV/ c interval and in six different centrality intervals (0–5, 5–10, 10–20, 20–30, 30–40 and 40–50%) using the scalar product technique. Measured π±, K± and p+p ¯ transverse-momentum spectra and v2are used to predict the deuteron pTspectra and v2within the Blast-Wave model. The predictions are able to reproduce the v2 coefficient in the measured pTrange and the transverse-momentum spectra for pT> 1.8 GeV/ c within the experimental uncertainties. The measurement of the coalescence parameter B2is performed, showing a pT dependence in contrast with the simplest coalescence model, which fails to reproduce also the measured v2 coefficient. In addition, the coalescence parameter B2 and the elliptic flow coefficient in the 20–40% centrality interval are compared with the AMPT model which is able, in its version without string melting, to reproduce the measured v2(pT) and the B2(pT) trend. © 2017, CERN for the benefit of the ALICE collaboration.
5.
  • Acharya, S, et al. (författare)
  • Production of π0 and η mesons up to high transverse momentum in pp collisions at 2.76 TeV
  • 2017
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 77:5
  • Tidskriftsartikel (refereegranskat)abstract
    • The invariant differential cross sections for inclusive π0 and η mesons at midrapidity were measured in pp collisions at s=2.76 TeV for transverse momenta 0.4 < pT< 40 GeV/c and 0.6 < pT< 20 GeV/c, respectively, using the ALICE detector. This large range in pT was achieved by combining various analysis techniques and different triggers involving the electromagnetic calorimeter (EMCal). In particular, a new single-cluster, shower-shape based method was developed for the identification of high-pT neutral pions, which exploits that the showers originating from their decay photons overlap in the EMCal. Above 4 GeV/c, the measured cross sections are found to exhibit a similar power-law behavior with an exponent of about 6.3. Next-to-leading-order perturbative QCD calculations differ from the measured cross sections by about 30% for the π0, and between 30–50% for the η meson, while generator-level simulations with PYTHIA 8.2 describe the data to better than 10–30%, except at pT< 1 GeV/c. The new data can therefore be used to further improve the theoretical description of π0 and η meson production. © 2017, CERN for the benefit of the ALICE collaboration.
6.
  • Acharya, S, et al. (författare)
  • Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC
  • 2017
  • Ingår i: Journal of High Energy Physics. - Springer. - 1126-6708. ; 2017:9, s. 32-32
  • Tidskriftsartikel (refereegranskat)abstract
    • The measurement of azimuthal correlations of charged particles is presented for Pb-Pb collisions at sNN=2.76 TeV and p-Pb collisions at sNN=5.02 TeV with the ALICE detector at the CERN Large Hadron Collider. These correlations are measured for the second, third and fourth order flow vector in the pseudorapidity region |η| < 0.8 as a function of centrality and transverse momentum pT using two observables, to search for evidence of pT-dependent flow vector fluctuations. For Pb-Pb collisions at 2.76 TeV, the measurements indicate that pT-dependent fluctuations are only present for the second order flow vector. Similar results have been found for p-Pb collisions at 5.02 TeV. These measurements are compared to hydrodynamic model calculations with event-by-event geometry fluctuations in the initial state to constrain the initial conditions and transport properties of the matter created in Pb–Pb and p–Pb collisions.[Figure not available: see fulltext.]. © 2017, The Author(s).
7.
8.
  • Adam, J., et al. (författare)
  • ALICE Collaboration
  • 2016
  • Ingår i: Nuclear Physics A. - Elsevier. - 0375-9474. ; 956, s. 913-921
  • Tidskriftsartikel (refereegranskat)
  •  
9.
  • Adam, J., et al. (författare)
  • Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at sNN =2.76 TeV
  • 2017
  • Ingår i: Physical Review Letters. - American Physical Society. - 1079-7114. ; 119:10
  • Tidskriftsartikel (refereegranskat)abstract
    • The measurement of two-particle angular correlations is a powerful tool to study jet quenching in a pT region inaccessible by direct jet identification. In these measurements pseudorapidity (Δη) and azimuthal (Δφ) differences are used to extract the shape of the near-side peak formed by particles associated with a higher pT trigger particle (1
10.
  • Adam, J., et al. (författare)
  • Centrality dependence of charged jet production in p–Pb collisions at √sNN = 5.02 TeV
  • 2016
  • Ingår i: European Physical Journal C. - Springer. - 1434-6044. ; 76:5
  • Tidskriftsartikel (refereegranskat)abstract
    • Measurements of charged jet production as a function of centrality are presented for p–Pb collisions recorded at √sNN = 5.02 TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon–nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from charged particles with the anti-kT algorithm for resolution parameters R= 0.2 and R= 0.4 in the transverse momentum range 20 to 120 GeV/c. The reconstructed jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the charged jet production in p–Pb collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial jet structure in the reported centrality classes. © 2016, CERN for the benefit of the ALICE collaboration.
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