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Displaying results 1 to 10 of 10.

  1. Transverse sphericity of primary charged particles in minimum bias proton-proton collisions at sqrt(s)=0.9, 2.76 and 7 TeV
    Author: 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.; Jangal, S.; Kuhn, C.; Maire, A.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Wan, R.; Aphecetche, Laurent; Batigne, Guillaume; Bregant, M.; Delagrange, H.; Driga, O.; Estienne, Magali; Germain, Marie; Lardeux, A.; Lefèvre, F.; Lenhardt, M.; Luquin, L.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Ahn, Sang Un; 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.; Cheshkov, C.; Cheynis, B.; Ducroux, L.; Grossiord, J.-Y.; Guilbaud, Maxime; Tieulent, R.; Uras, A.; Zoccarato, Y.
    Published: 2012
    Publisher:  HAL CCSD ; Springer Verlag (Germany)

    See paper for full list of authors - 21 pages, 11 figures ; Measurements of the sphericity of primary charged particles in minimum bias proton--proton collisions at sqrt(s)=0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The... more

     

    See paper for full list of authors - 21 pages, 11 figures ; Measurements of the sphericity of primary charged particles in minimum bias proton--proton collisions at sqrt(s)=0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is linearized to be collinear safe and is measured in the plane perpendicular to the beam direction using primary charged tracks with $p_{\rm T}\geq0.5$ GeV/c in $|\eta|\leq0.8$. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity ($N_{\rm ch}$) is reported for events with different $p_{\rm T}$ scales ("soft" and "hard") defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found to grow with multiplicity at all collision energies, with a steeper rise at low $N_{\rm ch}$, whereas the event generators show the opposite tendency. The combined study of the sphericity and the mean $p_{\rm T}$ with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in decreased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.

     
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    Parent title: ISSN: 1434-6044 ; EISSN: 1434-6052 ; European Physical Journal C: Particles and Fields ; http://hal.in2p3.fr/in2p3-00699404 ; European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2012, 72, pp.2124. ⟨10.1140/epjc/s10052-012-2124-9⟩
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
  2. Measurement of prompt and non-prompt J/psi production cross sections at mid-rapidity in pp collisions at sqrt(s) = 7 TeV
    Author: Abelev, B.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Belikov, I.; Bergognon, A.A.E.; Borel, H.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheshkov, C.; Cheynis, B.; Delagrange, H.; Driga, O.; Ducroux, L.; Estienne, Magali; Germain, Marie; Grossiord, J.-Y.; Guilbaud, Maxime; Hippolyte, B.; Jangal, S.; Kuhn, C.; Lardeux, A.; Lef'Evre, F.; Lenhardt, M.; Luquin, L.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pal, S.; Pereira Da Costa, H.; Pillot, Philippe; Rakotozafindrabe, A.; Roy, C.; Sanchez Castro, X.; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Wan, R.; Yang, H.; Zoccarato, Y.; Arbor, N.; Conesa Balbastre, G.; Faivre, J.; Furget, C.; Guernane, R.; Kox, S.; Real, J.S.; Silvestre, C.; Ahn, Sang Un; 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.
    Published: 2012
    Publisher:  HAL CCSD ; Springer

    see paper for full list of authors ; The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at {\surd}s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int =... more

     

    see paper for full list of authors ; The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at {\surd}s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L_int = 5.6nb-1. The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum pt > 1.3 GeV/c and rapidity |y| < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the Psi(2S) and Csi_c resonances, is sigma_prompt-J/psi(pt > 1.3 GeV/c, |y| < 0.9) = 7.2 +- 0.7(stat.) +- 1.0(syst.)+1.3-1.2 (syst.pol.) mb. The pt-differential cross section for prompt J/psi has also been measured. The cross section for the production of b-hadrons decaying to J/psi with transverse momentum greater than 1.3 GeV/c in the rapidity range |y| < 0.9 is sigma_{J/psi<-h_B} = 1.26 +- 0.33 (stat.) +0.23-0.28 (syst.) mb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total cross section and dsigma/dy at midrapidity.

     
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    Language: English
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    Parent title: ISSN: 1126-6708 ; EISSN: 1029-8479 ; Journal of High Energy Physics ; http://hal.in2p3.fr/in2p3-00702009 ; Journal of High Energy Physics, Springer, 2012, 2012, pp.065. &#x27E8;10.1007/JHEP11(2012)065&#x27E9;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
  3. K0s-K0s correlations in pp collisions at sqrt{s}=7 TeV from the LHC ALICE experiment
    Author: 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.; Roy, C.; Sanchez Castro, X.; Senyukov, S.; Aphecetche, Laurent; Batigne, Guillaume; Bergognon, E.; Bregant, M.; Delagrange, H.; Driga, O.; Estienne, Magali; Germain, Marie; Lardeux, A.; Lefèvre, F.; Lenhardt, M.; Luquin, L.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Matyja, A.; Pillot, Philippe; Schutz, Y.; Shabetai, Alexandre; Stocco, Diego; Ahn, Sang Un; 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.
    Published: 2012
    Publisher:  HAL CCSD ; Elsevier

    See paper for full list of authors - 10 pages + author list, 7 figures, to be submitted to Physics Letters B ; Identical neutral kaon pair correlations are measured in sqrt{s}=7 TeV pp collisions in the ALICE experiment. One-dimensional K0s-K0s... more

     

    See paper for full list of authors - 10 pages + author list, 7 figures, to be submitted to Physics Letters B ; Identical neutral kaon pair correlations are measured in sqrt{s}=7 TeV pp collisions in the ALICE experiment. One-dimensional K0s-K0s correlation functions in terms of the invariant momentum difference of kaon pairs are formed in two multiplicity and two transverse momentum ranges. The femtoscopic parameters for the radius and correlation strength of the kaon source are extracted. The fit includes quantum statistics and final-state interactions of the a0/f0 resonance. K0s-K0s correlations show an increase in radius for increasing multiplicity and a slight decrease in radius for increasing transverse mass, mT, as seen in pion-pion correlations in the pp system and in heavy-ion collisions. Transverse mass scaling is observed between the K0s-K0s and pion-pion radii. Also, the first observation is made of the decay of the f2'(1525) meson into the K0s-K0s channel in pp collisions.

     
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    Parent title: ISSN: 0370-2693 ; Physics Letters B ; https://hal.in2p3.fr/in2p3-00707149 ; Physics Letters B, Elsevier, 2012, 717, pp.151-161. &#x27E8;10.1016/j.physletb.2012.09.013&#x27E9;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  4. Measurement of inelastic, single- and double-diffraction cross sections in proton--proton collisions at the LHC with ALICE
    Author: 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.
    Published: 2013
    Publisher:  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... more

     

    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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    Parent title: 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;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
  5. Charged kaon femtoscopic correlations in pp collisions at $\sqrt{s}=7$ TeV
    Author: 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.
    Published: 2013
    Publisher:  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... more

     

    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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    Parent title: 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;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  6. Charge correlations using the balance function in Pb-Pb collisions at sqrt{s_{NN}} = 2.76 TeV
    Author: 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.
    Published: 2013
    Publisher:  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... more

     

    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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    Parent title: 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;
    Subjects: [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]
  7. J/Psi Elliptic Flow in Pb-Pb Collisions at sqrt(sNN) = 2.76 TeV
    Author: Abbas, E.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Bergognon, A.A.E.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheshkov, C.; Cheynis, B.; Delagrange, H.; Driga, O.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Geuna, C.; Guilbaud, Maxime; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Roy, C.; Sanchez Castro, X.; Schutz, Y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Yang, H.; Zoccarato, Y.; 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.
    Published: 2013
    Publisher:  HAL CCSD ; American Physical Society

    16 pages, 4 figures, 1 Table, authors from page 11 to 13 ; see paper for full list of authors ; We report on the first measurement of inclusive J/Psi elliptic flow, v2, in heavy-ion collisions at the LHC. The measurement is performed with the ALICE... more

     

    16 pages, 4 figures, 1 Table, authors from page 11 to 13 ; see paper for full list of authors ; We report on the first measurement of inclusive J/Psi elliptic flow, v2, in heavy-ion collisions at the LHC. The measurement is performed with the ALICE detector in Pb-Pb collisions at sqrt(sNN) = 2.76 TeV in the rapidity range 2.5 < y < 4.0. The dependence of the J/Psi v2 on the collision centrality and on the J/Psi transverse momentum is studied in the range 0 <= pT < 10 GeV/c. For semi-central Pb-Pb collisions at sqrt(sNN) = 2.76 TeV, an indication of non-zero v2 is observed with a maximum value of v2 = 0.116+/-0.046(stat.)+/-0.029(syst.) for J/Psi in the transverse momentum range 2 <= pT < 4 GeV/c. The elliptic flow measurement complements the previously reported ALICE results on the inclusive J/Psi nuclear modification factor and favors the scenario of a significant fraction of J/Psi production from charm quarks in a deconfined partonic phase.

     
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    Parent title: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; https://hal.in2p3.fr/in2p3-00804625 ; Physical Review Letters, American Physical Society, 2013, 111, pp.162301. &#x27E8;10.1103/PhysRevLett.111.162301&#x27E9;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  8. Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV
    Author: Abelev, B.; Aphecetche, Laurent; Baldisseri, A.; Batigne, Guillaume; Belikov, I.; Bergognon, A.A.E.; Borel, H.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheynis, B.; Delagrange, H.; Ducroux, L.; Erazmus, B.; Estienne, Magali; Germain, Marie; Grossiord, J.-Y.; Guilbaud, Maxime; Hippolyte, B.; Kuhn, C.; Lardeux, A.; Martin Blanco, J.; Martinez Garcia, Gines; Mas, A.; Massacrier, L.; Molnar, L.; Pereira da Costa, H.; Pillot, Philippe; Rakotozafindrabe, A.; Sanchez Castro, X.; Schutz, Y.; Senyukov, S.; Shabetai, Alexandre; Stocco, Diego; Uras, A.; Vernet, R.; Zoccarato, Y.; 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.
    Published: 2013
    Publisher:  HAL CCSD ; American Physical Society

    17 pages, 4 captioned figures, author from page 12 to 17 ; see paper for full list of authors ; The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by... more

     

    17 pages, 4 captioned figures, author from page 12 to 17 ; see paper for full list of authors ; The directed flow of charged particles at mid-rapidity is measured in Pb-Pb collisions at sqrt{s_NN}=2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd (v_1^odd) and even (v_1^even) directed flow components are reported. The v_1^odd component has a negative slope as a function of pseudorapidity similar to that observed at the highest RHIC energy, but with about a three times smaller magnitude. The v^even component is found to be non-zero and independent of pseudorapidity. Both components show little dependence on the collision centrality and change sign at transverse momenta around 1.2-1.7 GeV/c for midcentral collisions. The shape of v_1^even as a function of transverse momentum and a vanishing transverse momentum shift along the spectator deflection for v_1^even are consistent with dipole-like initial density fluctuations in the overlap zone of the nuclei.

     
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    Parent title: ISSN: 0031-9007 ; EISSN: 1079-7114 ; Physical Review Letters ; https://hal.in2p3.fr/in2p3-00835541 ; Physical Review Letters, American Physical Society, 2013, 111, pp.232302. &#x27E8;10.1103/PhysRevLett.111.232302&#x27E9;
    Subjects: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  9. Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC
    Author: 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.
    Published: 2013
    Publisher:  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... more

     

    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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    Source: BASE Selection for Comparative Literature
    Language: English
    Media type: Article (journal)
    Format: Online
    Parent title: 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;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
  10. J/psi production and nuclear effects in p-Pb collisions at sqrt(sNN)=5.02 TeV
    Author: Abelev, B.; Aphecetche, Laurent; Baek, Y.W.; Baldisseri, A.; Barret, V.; Bastid, N.; Belikov, I.; Bergognon, A.A.E.; Borel, H.; Bregant, M.; Castillo Castellanos, J.; Charvet, J.L.; Cheshkov, C.; Cheynis, B.; Crochet, P.; Delagrange, H.; Ducroux, L.; Dupieux, P.; Erazmus, B.; Estienne, Magali; Germain, Marie; Grossiord, J.-Y.; Guilbaud, Maxime; Lardeux, A.; Li, S.; Lopez, X.; Manso, F.; Marchisone, M.; Martinez Garcia, Gines; Martin Blanco, J.; 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.; Shabetai, Alexandre; Stocco, Diego; Tieulent, R.; Uras, A.; Vernet, R.; Vulpescu, B.; Yang, H.; Zhang, X.; Zoccarato, Y.
    Published: 2014
    Publisher:  HAL CCSD ; Springer

    Comments: 20 pages, 6 captioned figures, 0 tables, authors from page 15 to page 17 ; see paper for full list of authors ; Inclusive J/psi production has been studied with the ALICE detector in p-Pb collisions at sqrt(sNN) = 5.02 TeV at the CERN LHC,... more

     

    Comments: 20 pages, 6 captioned figures, 0 tables, authors from page 15 to page 17 ; see paper for full list of authors ; Inclusive J/psi production has been studied with the ALICE detector in p-Pb collisions at sqrt(sNN) = 5.02 TeV at the CERN LHC, in the rapidity domains 2.03 < ycms < 3.53 and -4.46 < ycms < -2.96, down to zero transverse momentum. The J/psi measurement is performed in the Muon Spectrometer through the mu+ mu- decay mode. In this paper, the J/psi production cross section and the nuclear modification factor R(pPb) for the rapidities under study are presented. While at forward rapidity, corresponding to the proton direction, a suppression of the J/psi yield with respect to binary-scaled pp collisions is observed, in the backward region no suppression is present. The ratio of the forward and backward yields is also shown differentially in rapidity and transverse momentum. Theoretical predictions based on nuclear shadowing, as well as on models including, in addition, a contribution from partonic energy loss, are in fair agreement with the experimental results.

     
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    Source: BASE Selection for Comparative Literature
    Language: English
    Media type: Article (journal)
    Format: Online
    Parent title: ISSN: 1126-6708 ; EISSN: 1029-8479 ; Journal of High Energy Physics ; https://hal.in2p3.fr/in2p3-00856719 ; Journal of High Energy Physics, Springer, 2014, 2, pp.073. &#x27E8;10.1007/JHEP02(2014)073&#x27E9;
    Subjects: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]