Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV
2012
ALICE Collaboration (ukupan broj autora: 939)
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Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 LT p(T)(t,a) LT 15 GeV/c, where p(T)(t) GT p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| LT 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| GT 0.8, and are referred to as long-range correlations. Fourier components V-n Delta equivalent to LT cos(n Delta phi) GT are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V-n Delta (p(T)(t), p(T)(a)) is fully described in terms of single...-particle anisotropies v(n)(p(T)) as V-n Delta(p(T)(t), p(T)(a)) = v(n)(p(T)(t))v(n)(p(T)(a)). This expectation is tested for 1 LT = n LT = 5 by applying a global fit of all V-n Delta(p(T)(t), p(T)(a)) to obtain the best values v(n){GF}(p(T)). It is found that for 2 LT = n LT = 5, the fit agrees well with data up to p(T)(a) similar to 3-4 GeV/c, with a trend of increasing deviation as p(T)(t) and p(T)(a) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 LT p(T) LT 15 GeV/c range using a single v(n)(p(T)) curve: such a description is however approximately possible for 2 LT = n LT = 5 when p(T)(a) LT 4 GeV/c. For the n = 1 harmonic, however, a single v(1)(p(T)) curve is not obtained even within the reduced range p(T)(a) LT 4 GeV/c. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Извор:
Physics Letters B, 2012, 708, 3-5, 249-264Финансирање / пројекти:
- Department of Science and Technology, South Africa, Calouste Gulbenkian Foundation from Lisbon, Swiss Fonds Kidagan, Armenia, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Financiadora de Estudos e Projetos (FINEP), Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), National Natural Science Foundation of China (NSFC), Chinese Ministry of Education (CMOE), Ministry of Science and Technology of China (MSTC), Ministry of Education and Youth of the Czech Republic, Danish Natural Science Research Council, Carlsberg Foundation, Danish National Research Foundation, European Research Council under the European Community, Helsinki Institute of Physics, Academy of Finland, French CNRS-IN2P3, Region Pays de Loire, Region Alsace, Region Auvergne, CEA, France, German BMBF, Helmholtz Association, General Secretariat for Research and Technology, Ministry of Development, Greece, Hungarian OTKA, National Office for Research and Technology (NKTH), Department of Atomic Energy of the Government of India, Department of Science and Technology of the Government of India, Istituto Nazionale di Fisica Nucleare (INFN) of Italy, MEXT, Japan, Joint Institute for Nuclear Research, Dubna, National Research Foundation of Korea (NRF), CONACYT, Mexico, DGAPA, Mexico, ALFA-EC, HELEN (High-Energy physics Latin-American-European Network), Stichting voor Fundamenteel Onderzoek der Materie (FOM), Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO), Netherlands, Research Council of Norway (NFR), Polish Ministry of Science and Higher Education, National Authority for Scientific Research - NASR (Autoritatea Nationala pentru Cercetare Stiintifica - ANCS), Federal Agency of Science of the Ministry of Education and Science of Russian Federation, International Science and Technology Center, Russian Academy of Sciences, Russian Federal Agency of Atomic Energy, Russian Federal Agency for Science and Innovations, CERN-INTAS, Ministry of Education of Slovakia, CIEMAT, EELA, Ministerio de Educacion y Ciencia of Spain, Xunta de Galicia (Conselleria de Educacion), CEADEN, Cubaenergia, Cuba, IAEA (International Atomic Energy Agency): Swedish Research Council (VR), Knut and Alice Wallenberg Foundation (KAW), Ukraine Ministry of Education and Science, United Kingdom Science and Technology Facilities Council (STFC), United States Department of Energy, United States National Science Foundation, State of Texas, State of Ohio
DOI: 10.1016/j.physletb.2012.01.060
ISSN: 0370-2693; 1873-2445
WoS: 000301556500004
Scopus: 2-s2.0-84863115572
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VinčaTY - JOUR AU - Aamodt, K. AU - Milošević, Jovan PY - 2012 UR - https://vinar.vin.bg.ac.rs/handle/123456789/4744 AB - Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 LT p(T)(t,a) LT 15 GeV/c, where p(T)(t) GT p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| LT 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| GT 0.8, and are referred to as long-range correlations. Fourier components V-n Delta equivalent to LT cos(n Delta phi) GT are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V-n Delta (p(T)(t), p(T)(a)) is fully described in terms of single-particle anisotropies v(n)(p(T)) as V-n Delta(p(T)(t), p(T)(a)) = v(n)(p(T)(t))v(n)(p(T)(a)). This expectation is tested for 1 LT = n LT = 5 by applying a global fit of all V-n Delta(p(T)(t), p(T)(a)) to obtain the best values v(n){GF}(p(T)). It is found that for 2 LT = n LT = 5, the fit agrees well with data up to p(T)(a) similar to 3-4 GeV/c, with a trend of increasing deviation as p(T)(t) and p(T)(a) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 LT p(T) LT 15 GeV/c range using a single v(n)(p(T)) curve: such a description is however approximately possible for 2 LT = n LT = 5 when p(T)(a) LT 4 GeV/c. For the n = 1 harmonic, however, a single v(1)(p(T)) curve is not obtained even within the reduced range p(T)(a) LT 4 GeV/c. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved. T2 - Physics Letters B T1 - Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV VL - 708 IS - 3-5 SP - 249 EP - 264 DO - 10.1016/j.physletb.2012.01.060 ER -
@article{ author = "Aamodt, K. and Milošević, Jovan", year = "2012", abstract = "Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb-Pb collisions at root s(NN) = 2.76 TeV for transverse momenta 0.25 LT p(T)(t,a) LT 15 GeV/c, where p(T)(t) GT p(T)(a). The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |eta| LT 1.0. Distributions in relative azimuth Delta phi equivalent to phi(t) - phi(a) are analyzed for |Delta eta| equivalent to |eta(t) - eta(a)| GT 0.8, and are referred to as long-range correlations. Fourier components V-n Delta equivalent to LT cos(n Delta phi) GT are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy V-n Delta (p(T)(t), p(T)(a)) is fully described in terms of single-particle anisotropies v(n)(p(T)) as V-n Delta(p(T)(t), p(T)(a)) = v(n)(p(T)(t))v(n)(p(T)(a)). This expectation is tested for 1 LT = n LT = 5 by applying a global fit of all V-n Delta(p(T)(t), p(T)(a)) to obtain the best values v(n){GF}(p(T)). It is found that for 2 LT = n LT = 5, the fit agrees well with data up to p(T)(a) similar to 3-4 GeV/c, with a trend of increasing deviation as p(T)(t) and p(T)(a) are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25 LT p(T) LT 15 GeV/c range using a single v(n)(p(T)) curve: such a description is however approximately possible for 2 LT = n LT = 5 when p(T)(a) LT 4 GeV/c. For the n = 1 harmonic, however, a single v(1)(p(T)) curve is not obtained even within the reduced range p(T)(a) LT 4 GeV/c. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.", journal = "Physics Letters B", title = "Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV", volume = "708", number = "3-5", pages = "249-264", doi = "10.1016/j.physletb.2012.01.060" }
Aamodt, K.,& Milošević, J.. (2012). Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV. in Physics Letters B, 708(3-5), 249-264. https://doi.org/10.1016/j.physletb.2012.01.060
Aamodt K, Milošević J. Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV. in Physics Letters B. 2012;708(3-5):249-264. doi:10.1016/j.physletb.2012.01.060 .
Aamodt, K., Milošević, Jovan, "Harmonic decomposition of two particle angular correlations in Pb-Pb collisions at root s(NN)=2.76 TeV" in Physics Letters B, 708, no. 3-5 (2012):249-264, https://doi.org/10.1016/j.physletb.2012.01.060 . .