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  1. Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICE
    Autor*in: Abelev, B.; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-Y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, Y.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Lefèvre, F.; Luquin, L.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Baek, Y.W.; Baldit, A.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.; Zhang, X.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Springer Verlag (Germany)

    see paper for full list of authors, 27 pages, 12 figures, submitted to Eur. Phys. J. C ; Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The... mehr

     

    see paper for full list of authors, 27 pages, 12 figures, submitted to Eur. Phys. J. C ; Measurements of cross sections of inelastic and diffractive processes in proton--proton collisions at LHC energies were carried out with the ALICE detector. The fractions of diffractive processes in inelastic collisions were determined from a study of gaps in charged particle pseudorapidity distributions: for single diffraction (diffractive mass $M_X < 200$ GeV/$c^2$) $\sigma_{\rm SD}/\sigma_{\rm INEL} = 0.21 \pm 0.03, 0.20^{+0.07}_{-0.08}$, and $0.20^{+0.04}_{-0.07}$, respectively at centre-of-mass energies $\sqrt{s} = 0.9, 2.76$, and 7 TeV; for double diffraction (for a pseudorapidity gap $\Delta\eta > 3$) $\sigma_{\rm DD}/\sigma_{\rm INEL} = 0.11 \pm 0.03, 0.12 \pm 0.05$, and $0.12^{+0.05}_{-0.04}$, respectively at $\sqrt{s} = 0.9, 2.76$, and 7 TeV. To measure the inelastic cross section, beam properties were determined with van der Meer scans, and, using a simulation of diffraction adjusted to data, the following values were obtained: $\sigma_{\rm INEL} = 62.8^{+2.4}_{-4.0} (model) \pm 1.2 (lumi)$ mb at $\sqrt{s} =$ 2.76 TeV and $73.2^{+2.0}_{-4.6} (model) \pm 2.6 (lumi)$ mb at $\sqrt{s}$ = 7 TeV. The single- and double-diffractive cross sections were calculated combining relative rates of diffraction with inelastic cross sections. The results are compared to previous measurements at proton--antiproton and proton--proton colliders at lower energies, to measurements by other experiments at the LHC, and to theoretical models.

     
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    Übergeordneter Titel: ISSN: 1434-6044 ; EISSN: 1434-6052 ; European Physical Journal C: Particles and Fields ; http://hal.in2p3.fr/in2p3-00725471 ; European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2013, 73, pp.2456. &#x27E8;10.1140/epjc/s10052-013-2456-0&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
  2. Long-range angular correlations on the near and away side in p-Pb collisions at sqrt(sNN) = 5.02 TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.; Molnar, L.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, y.; Baek, y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    See paper for full list of authors - 22 pages, 5 figures, author list from page 16; submitted to PLB ; Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon... mehr

     

    See paper for full list of authors - 22 pages, 5 figures, author list from page 16; submitted to PLB ; Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5 < pT,assoc < pT,trig < 4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and pT bins, and the widths show no significant evolution with event multiplicity or pT. These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00763590 ; Physics Letters B, Elsevier, 2013, 719, pp.29-41. &#x27E8;10.1016/j.physletb.2013.01.012&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  3. Charged kaon femtoscopic correlations in pp collisions at $\sqrt{s}=7$ TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.; Molnar, L.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Guilbaud, Maxime; Uras, A.; Tieulent, R.; Zoccarato, Y.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.; Zhang, X.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    See paper for full list of authors - 16 pages, 4 figures ; Correlations of two charged identical kaons (Kch Kch) are measured in pp collisions at sqrt{s}=7 TeV by the ALICE experiment at the Large Hadron Collider (LHC). One-dimensional Kch Kch... mehr

     

    See paper for full list of authors - 16 pages, 4 figures ; Correlations of two charged identical kaons (Kch Kch) are measured in pp collisions at sqrt{s}=7 TeV by the ALICE experiment at the Large Hadron Collider (LHC). One-dimensional Kch Kch correlation functions are constructed in three multiplicity and four transverse momentum ranges. The Kch Kch femtoscopic source parameters R and lambda are extracted. The Kch Kch correlations show a slight increase of femtoscopic radii with increasing multiplicity and a slight decrease of radii with increasing transverse momentum. These trends are similar to the ones observed for pi pi and Ks0 Ks0 correlations in pp and heavy-ion collisions. However, the observed one dimensional correlation radii for charged kaons are larger at high multiplicities than those for pions in contrast to what was observed in heavy-ion collisions at RHIC.

     
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    Übergeordneter Titel: ISSN: 1550-7998 ; EISSN: 1550-2368 ; Physical Review D ; http://hal.in2p3.fr/in2p3-00769524 ; Physical Review D, American Physical Society, 2013, 87, pp.052016. &#x27E8;10.1103/PhysRevD.87.052016&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  4. Charge correlations using the balance function in Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.C.; Molnar, L.; Roy, C.S.; Sanchez Castro, X.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-Y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, Y.; Baek, Y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.; Porteboeuf-Houssais, S.; Rosnet, P.; Vulpescu, B.; Zhang, X.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    See paper for full list of authors - 37 pages, 7 figures, one column, author list until page 12, submitted to Physics Letters B ; In high-energy heavy-ion collisions, the correlations between the emitted particles can be used as a probe to gain... mehr

     

    See paper for full list of authors - 37 pages, 7 figures, one column, author list until page 12, submitted to Physics Letters B ; In high-energy heavy-ion collisions, the correlations between the emitted particles can be used as a probe to gain insight into the charge creation mechanisms. In this article, we report the first results of such studies using the electric charge balance function in the relative pseudorapidity \Delta\eta and azimuthal angle \Delta\phi in Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV with the ALICE detector at the Large Hadron Collider. The width of the balance function decreases with growing centrality (i.e. for more central collisions) in both projections. This centrality dependence is not reproduced by HIJING, while AMPT, a model which incorporates strings and parton rescattering, exhibits qualitative agreement with the measured correlations in \Delta\phi but fails to describe the correlations in \Delta\eta. A thermal blast wave model incorporating local charge conservation and tuned to describe the p_T spectra and v_2 measurements reported by ALICE, is used to fit the centrality dependence of the width of the balance function and to extract the average separation of balancing charges at freeze-out. The comparison of our results with measurements at lower energies reveals an ordering with sqrt{s_{NN}}: the balance functions become narrower with increasing energy for all centralities. This is consistent with the effect of larger radial flow at the LHC energies but also with the late stage creation scenario of balancing charges. However, the relative decrease of the balance function widths in \Delta\eta and \Delta\phi with centrality from the highest SPS to the LHC energy exhibits only small differences. This observation cannot be interpreted solely within the framework where the majority of the charge is produced at a later stage in the evolution of the heavy-ion collision.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00777176 ; Physics Letters B, Elsevier, 2013, 723, pp.267-279. &#x27E8;10.1016/j.physletb.2013.05.039&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
  5. Centrality determination of Pb-Pb collisions at sqrt(sNN) = 2.76 TeV with ALICE
    Autor*in: Abelev, B.; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, y.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.C.; Molnar, L.; Roy, C.S.; Sanchez Castro, X.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Pillot, Philippe; Schutz, y.; Shabetai, Alexandre; Stocco, Diego; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Baek, y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Lopez, X.; Manso, F.; Marchisone, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; American Physical Society

    37 pages, 16 figures, authors from page 31 ; see paper for full list of authors ; This publication describes the methods used to measure the centrality of inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding nucleon pair... mehr

     

    37 pages, 16 figures, authors from page 31 ; see paper for full list of authors ; This publication describes the methods used to measure the centrality of inelastic Pb-Pb collisions at a center-of-mass energy of 2.76 TeV per colliding nucleon pair with ALICE. The centrality is a key parameter in the study of the properties of QCD matter at extreme temperature and energy density, because it is directly related to the initial overlap region of the colliding nuclei. Geometrical properties of the collision, such as the number of participating nucleons and number of binary nucleon-nucleon collisions, are deduced from a Glauber model with a sharp impact parameter selection, and shown to be consistent with those extracted from the data. The centrality determination provides a tool to compare ALICE measurements with those of other experiments and with theoretical calculations.

     
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    Übergeordneter Titel: ISSN: 2469-9985 ; EISSN: 2469-9993 ; Physical Review C ; http://hal.in2p3.fr/in2p3-00778545 ; Physical Review C, American Physical Society, 2013, 88, pp.044909. &#x27E8;10.1103/PhysRevC.88.044909&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  6. Energy Dependence of the Transverse Momentum Distributions of Charged Particles in pp Collisions Measured by ALICE
    Autor*in: Abelev, B.; Aphecetche, Laurent; Baek, y.W.; Baldisseri, A.; Barret, V.; Bastid, N.; Batigne, Guillaume; Borel, H.; Bregant, M.; Charvet, J.L.; Cheynis, B.; Cheshkov, C.; Crochet, P.; Delagrange, H.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Grossiord, J.-y.; Guilbaud, Maxime; Hippolyte, B.; Ichou, R.; Kuhn, C.; Lardeux, A.; Li, S.; Lopez, X.; Manso, F.; Marchisone, M.; Martin Blanco, J.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Porteboeuf-Houssais, S.; Rakotozafindrabe, A.; Rosnet, P.; Roy, C.; Sanchez Castro, X.; Schutz, y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Vulpescu, B.; Zhang, X.; Zoccarato, y.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Springer Verlag (Germany)

    18 pages, 5 captioned figures, 1 table, authors from page 13 to page 18 ; see paper for full list of authors ; Differential cross sections of charged particles in inelastic pp collisions as a function of p_T have been measured at sqrt(s) = 0.9, 2.76... mehr

     

    18 pages, 5 captioned figures, 1 table, authors from page 13 to page 18 ; see paper for full list of authors ; Differential cross sections of charged particles in inelastic pp collisions as a function of p_T have been measured at sqrt(s) = 0.9, 2.76 and 7 TeV at the LHC. The p_T spectra are compared to NLO-pQCD calculations. Though the differential cross section for an individual sqrt(s) cannot be described by NLO-pQCD, the relative increase of cross section with sqrt(s) is in agreement with NLO-pQCD. Based on these measurements and observations, procedures are discussed to construct pp reference spectra at sqrt(s) = 2.76 and 5.02 TeV up to p_T = 50 GeV/c as required for the calculation of the nuclear modification factor in nucleus-nucleus and proton-nucleus collisions.

     
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    Übergeordneter Titel: ISSN: 1434-6044 ; EISSN: 1434-6052 ; European Physical Journal C: Particles and Fields ; http://hal.in2p3.fr/in2p3-00841160 ; European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2013, 73, pp.2662. &#x27E8;10.1140/epjc/s10052-013-2662-9&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  7. Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
    Autor*in: Abelev, B.; Aphecetche, Laurent; Baek, Y.W.; Baldisseri, A.; Barret, V.; Bastid, N.; Batigne, Guillaume; Borel, H.; Bregant, M.; Charvet, J.L.; Cheynis, B.; Cheshkov, C.; Crochet, P.; Delagrange, H.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Grossiord, J.-Y.; Guilbaud, Maxime; Hippolyte, B.; Ichou, R.; Kuhn, C.; Lardeux, A.; Li, S.; Lopez, X.; Manso, F.; Marchisone, M.; Martin Blanco, J.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Porteboeuf-Houssais, S.; Rakotozafindrabe, A.; Rosnet, P.; Roy, C.; Sanchez Castro, X.; Schutz, Y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Vulpescu, B.; Zhang, X.; Zoccarato, Y.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    18 pages, 4 captioned figures, 2 tables, author from page 13 to page 18 ; see paper for full list of authors ; The average transverse momentum versus the charged-particle multiplicity N_ch was measured in p-Pb collisions at a collision energy per... mehr

     

    18 pages, 4 captioned figures, 2 tables, author from page 13 to page 18 ; see paper for full list of authors ; The average transverse momentum versus the charged-particle multiplicity N_ch was measured in p-Pb collisions at a collision energy per nucleon-nucleon pair sqrt(s_NN) = 5.02 TeV and in pp collisions at collision energies of sqrt(s) = 0.9, 2.76, and 7 Tev in the kinematic range 0.15 < p_T < 10.0 Gev/c and |eta| < 0.3 with the ALICE apparatus at the LHC. These data are compared to results in Pb-Pb collisions at sqrt(s_NN) = 2.76 Tev at similar charged-particle multiplicities. In pp and p-Pb collisions, a strong increase of with N_ch is observed, which is much stronger than that measured in Pb-Pb collisions. For pp collisions, this could be attributed, within a model of hadronizing strings, to multiple-parton interactions and to a final-state color reconnection mechanism. The data in p-Pb and Pb-Pb collisions cannot be described by an incoherent superposition of nucleon-nucleon collisions and pose a challenge to most of the event generators.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; https://hal.in2p3.fr/in2p3-00841162 ; Physics Letters B, Elsevier, 2013, 727, pp.371-380. &#x27E8;10.1016/j.physletb.2013.10.054&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  8. Long-range angular correlations of pi, K and p in p--Pb collisions at sqrt(s_NN) = 5.02 TeV
    Autor*in: Abelev, B.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Vernet, R.; Belikov, I.; Hippolyte, B.; Kuhn, C.; Molnar, L.; Roy, C.; Sanchez Castro, X.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Erazmus, B.; Estienne, Magali; Germain, Marie; Lardeux, A.; Martinez Garcia, Gines; Martin Blanco, J.; Mas, A.; Massacrier, L.; Pillot, Philippe; Schutz, y.; Shabetai, Alexandre; Stocco, Diego; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, y.; Baek, y.W.; Barret, V.; Bastid, N.; Crochet, P.; Dupieux, P.; Ichou, R.; Li, S.; Lopez, X.; Manso, F.; Marchisone, M.
    Erschienen: 2013
    Verlag:  HAL CCSD ; Elsevier

    See paper for full list of authors - 26 pages, 4 captioned figures, 2 tables, Author from page 20 to page 23 ; Angular correlations between unidentified charged trigger particles and various species of charged associated particles (unidentified... mehr

     

    See paper for full list of authors - 26 pages, 4 captioned figures, 2 tables, Author from page 20 to page 23 ; Angular correlations between unidentified charged trigger particles and various species of charged associated particles (unidentified particles, pions, kaons, protons and antiprotons) are measured by the ALICE detector in p-Pb collisions at a nucleon--nucleon centre-of-mass energy of 5.02 TeV in the transverse-momentum range 0.3 < p_T < 4 GeV/c. The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range |eta_lab|<0.8. Fourier coefficients are extracted from the long-range correlations projected onto the azimuthal angle difference and studied as a function of $\pt$ and in intervals of event multiplicity. In high-multiplicity events, the second-order coefficient for protons, v_2^p, is observed to be smaller than that for pions, v_2^pi, up to about p_T = 2 GeV/c. To reduce correlations due to jets, the per-trigger yield measured in low-multiplicity events is subtracted from that in high-multiplicity events. A two-ridge structure is obtained for all particle species. The Fourier decomposition of this structure shows that the second-order coefficients for pions and kaons are similar. The v_2^p is found to be smaller at low p_T and larger at higher p_T than v_2^pi, with a crossing occurring at about 2 GeV. This is qualitatively similar to the elliptic-flow pattern observed in heavy-ion collisions. A mass ordering effect at low transverse momenta is consistent with expectations from hydrodynamic model calculations assuming a collectively expanding system.

     
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    Übergeordneter Titel: ISSN: 0370-2693 ; Physics Letters B ; http://hal.in2p3.fr/in2p3-00843893 ; Physics Letters B, Elsevier, 2013, 726, pp.164-177. &#x27E8;10.1016/j.physletb.2013.08.024&#x27E9;
    Schlagworte: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]