Navegar

Colección

Datos Estadísticas

Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

A detailed study of multiparticle azimuthal correlations is presented using pp data at s=5.02 and 13 TeV, and p+Pb data at sNN=5.02 TeV, recorded with the ATLAS detector at the CERN Large Hadron Collider. The azimuthal correlations are probed using four-particle cumulants cn{4} and flow coefficients vn{4}=(-cn{4})1/4 for n=2 and 3, with the goal of extracting long-range multiparticle azimuthal correlation signals and suppressing the short-range correlations. The values of cn{4} are obtained as a function of the average number of charged particles per event, Nch, using the recently proposed two-subevent and three-subevent cumulant methods, and compared with results obtained with the standard cumulant method. The standard method is found to be strongly biased by short-range correlations, which originate mostly from jets with a positive contribution to cn{4}. The three-subevent method, on the other hand, is found to be least sensitive to short-range correlations. The three-subevent method gives a negative c2{4}, and therefore a well-defined v2{4}, nearly independent of Nch, which implies that the long-range multiparticle azimuthal correlations persist to events with low multiplicity. Furthermore, v2{4} is found to be smaller than the v2{2} measured using the two-particle correlation method, as expected for long-range collective behavior. Finally, the measured values of v2{4} and v2{2} are used to estimate the number of sources relevant for the initial eccentricity in the collision geometry. The results based on the subevent cumulant technique provide direct evidence, in small collision systems, for a long-range collectivity involving many particles distributed across a broad rapidity interval. ©2018 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 .

Registro:

Documento: Artículo
Título:Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider
Autor:Aaboud, M. et al.
Este artículo contiene 2897 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2897 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2018
Volumen:97
Número:2
DOI: http://dx.doi.org/10.1103/PhysRevC.97.024904
Título revista:Physical Review C
Título revista abreviado:Phys. Rev. C
ISSN:24699985
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_24699985_v97_n2_p_Aaboud

Referencias:

  • Abelev, B.I., Long range rapidity correlations and jet production in high energy nuclear collisions (2009) Phys. Rev. C, 80, p. 064912. , (STAR Collaboration)
  • Alver, B., High Transverse Momentum Triggered Correlations over a Large Pseudorapidity Acceptance in Au+Au Collisions at (Equation presented) GeV (2010) Phys. Rev. Lett., 104, p. 062301. , (PHOBOS Collaboration)
  • Aamodt, K., Higher Harmonic Anisotropic Flow Measurements of Charged Particles in Pb-Pb Collisions at (Equation presented) TeV (2011) Phys. Rev. Lett., 107, p. 032301. , (ALICE Collaboration)
  • Measurement of the azimuthal anisotropy for charged particle production in (Equation presented) TeV lead-lead collisions with the ATLAS detector (2012) Phys. Rev. C, 86, p. 014907. , ATLAS Collaboration
  • Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at (Equation presented) = 2.76 TeV (2014) Phys. Rev. C, 89, p. 044906. , CMS Collaboration
  • Adare, A., Dihadron azimuthal correlations in Au+Au collisions at (Equation presented) GeV (2008) Phys. Rev. C, 78, p. 014901. , (PHENIX Collaboration)
  • Observation of long-range near-side angular correlations in proton-lead collisions at the LHC (2013) Phys. Lett. B, 718, p. 795. , CMS Collaboration
  • Abelev, B., Long-range angular correlations on the near and away side in (Equation presented)-Pb collisions at (Equation presented) TeV (2013) Phys. Lett. B, 719, p. 29. , (ALICE Collaboration)
  • Observation of Associated Near-Side and Away-Side Long-Range Correlations in (Equation presented)=5.02 TeV Proton-lead Collisions with the ATLAS Detector (2013) Phys. Rev. Lett., 110, p. 182302. , ATLAS Collaboration
  • Measurement of long-range pseudorapidity correlations and azimuthal harmonics in (Equation presented) = 5.02 TeV proton-lead collisions with the ATLAS detector (2014) Phys. Rev. C, 90, p. 044906. , ATLAS Collaboration
  • Evidence for Collective Multiparticle Correlations in p-Pb Collisions (2015) Phys. Rev. Lett., 115, p. 012301. , CMS Collaboration
  • Adare, A., Quadrupole Anisotropy in Dihadron Azimuthal Correlations in Central (Equation presented) Collisions at (Equation presented) GeV (2013) Phys. Rev. Lett., 111, p. 212301. , (PHENIX Collaboration)
  • Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC (2010) J. High Energy Phys., (9), p. 091. , CMS Collaboration
  • Observation of Long-Range Elliptic Azimuthal Anisotropies in (Equation presented) and 2.76 TeV (Equation presented) Collisions with the ATLAS Detector (2016) Phys. Rev. Lett., 116, p. 172301. , ATLAS Collaboration
  • Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for (Equation presented) collisions at (Equation presented) and 13 TeV and (Equation presented)+Pb collisions at (Equation presented) TeV with the ATLAS detector (2017) Phys. Rev. C, 96, p. 024908. , ATLAS Collaboration
  • Measurement of multiparticle azimuthal correlations in (Equation presented), (Equation presented)+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector (2017) Eur. Phys. J. C, 77, p. 428. , ATLAS Collaboration
  • Bozek, P., Broniowski, W., Collective dynamics in high-energy proton-nucleus collisions (2013) Phys. Rev. C, 88, p. 014903
  • Dusling, K., Venugopalan, R., Comparison of the color glass condensate to dihadron correlations in proton-proton and proton-nucleus collisions (2013) Phys. Rev. D, 87, p. 094034
  • Evidence for collectivity in pp collisions at the LHC (2017) Phys. Lett. B, 765, p. 193. , CMS Collaboration
  • Borghini, N., Dinh, P.M., Ollitrault, J.-Y., A New method for measuring azimuthal distributions in nucleus-nucleus collisions (2001) Phys. Rev. C, 63, p. 054906
  • Measurement with the ATLAS detector of multiparticle azimuthal correlations in p+Pb collisions at (Equation presented) TeV (2013) Phys. Lett. B, 725, p. 60. , ATLAS Collaboration
  • Aidala, C., (PHENIX Collaboration), arXiv:1707.06108 [nucl-ex]; Jia, J., Zhou, M., Trzupek, A., Revealing long-range multiparticle collectivity in small collision systems via subevent cumulants (2017) Phys. Rev. C, 96, p. 034906
  • Sjöstrand, T., Mrenna, S., Skands, P.Z., (2008) Comput. Phys. Commun., 178, p. 852. , A Brief Introduction to pythia8.1
  • Bilandzic, A., Snellings, R., Voloshin, S., Flow analysis with cumulants: Direct calculations (2011) Phys. Rev. C, 83, p. 044913
  • Bilandzic, A., Christensen, C.H., Gulbrandsen, K., Hansen, A., Zhou, Y., Generic framework for anisotropic flow analyses with multiparticle azimuthal correlations (2014) Phys. Rev. C, 89, p. 064904
  • The ATLAS Experiment at the CERN Large Hadron Collider (2008) JINST, 3, p. S08003. , ATLAS Collaboration
  • The ATLAS Inner Detector commissioning and calibration (2010) Eur. Phys. J. C, 70, p. 787. , ATLAS Collaboration
  • ATLAS Collaboration, ATLAS Insertable B-Layer Technical Design Report, Atlas-tdr-19, 2010, ATLAS Insertable B-Layer Technical Design Report Addendum, ATLAS-TDR-19-ADD-1, 2012; Performance of the ATLAS Trigger System in 2010 (2012) Eur. Phys. J. C, 72, p. 1849. , ATLAS Collaboration
  • Charged-particle distributions in (Equation presented) TeV (Equation presented) interactions measured with the ATLAS detector at the LHC (2016) Phys. Lett. B, 758, p. 67. , ATLAS Collaboration
  • ATLAS Collaboration, Performance of the ATLAS Minimum Bias and Forward Detector Triggers in pPb collisions, ATLAS-CONF-2013-104; ATLAS Collaboration, ATLAS tunes of PYTHIA 6 and Pythia 8 for MC11, ATLAS-PHYS-PUB-2011-009; Gyulassy, M., Wang, X.-N., HIJING 1.0: A Monte Carlo program for parton and particle production in high-energy hadronic and nuclear collisions (1994) Comput. Phys. Commun., 83, p. 307
  • Agostinelli, S., Geant4: A Simulation toolkit (2003) Nucl. Instrum. Methods A, 506, p. 250. , (GEANT4 Collaboration)
  • The ATLAS Simulation Infrastructure (2010) Eur. Phys. J. C, 70, p. 823. , ATLAS Collaboration
  • Measurement of forward-backward multiplicity correlations in lead-lead, proton-lead and proton-proton collisions with the ATLAS detector (2017) Phys. Rev. C, 95, p. 064914. , ATLAS Collaboration
  • Bzdak, A., Bozek, P., McLerran, L., Fluctuation induced equality of multiparticle eccentricities for four or more particles (2014) Nucl. Phys. A, 927, p. 15
  • Yan, L., Ollitrault, J.-Y., Universal Fluctuation-Driven Eccentricities in Proton-Proton, Proton-Nucleus and Nucleus-Nucleus Collisions (2014) Phys. Rev. Lett., 112, p. 082301
  • ATLAS Collaboration, ATLAS Computing Acknowledgements 2016-2017, ATL-GEN-PUB-2016-002

Citas:

---------- APA ----------
(2018) . Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider. Physical Review C, 97(2).
http://dx.doi.org/10.1103/PhysRevC.97.024904
---------- CHICAGO ----------
Aaboud, M. "Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider" . Physical Review C 97, no. 2 (2018).
http://dx.doi.org/10.1103/PhysRevC.97.024904
---------- MLA ----------
Aaboud, M. "Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider" . Physical Review C, vol. 97, no. 2, 2018.
http://dx.doi.org/10.1103/PhysRevC.97.024904
---------- VANCOUVER ----------
Aaboud, M. Measurement of long-range multiparticle azimuthal correlations with the subevent cumulant method in pp and p +Pb collisions with the ATLAS detector at the CERN Large Hadron Collider. Phys. Rev. C. 2018;97(2).
http://dx.doi.org/10.1103/PhysRevC.97.024904