Abstract
Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 < |η| < 4.0) and associated particles in the central range (|η| < 1.0) are measured with the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The trigger particles are reconstructed using the muon spectrometer, and the associated particles by the central barrel tracking detectors. In high-multiplicity events, the double-ridge structure, previously discovered in two-particle angular correlations at midrapidity, is found to persist to the pseudorapidity ranges studied in this Letter. The second-order Fourier coefficients for muons in high-multiplicity events are extracted after jet-like correlations from low-multiplicity events have been subtracted. The coefficients are found to have a similar transverse momentum (pT) dependence in p-going (p-Pb) and Pb-going (Pb-p) configurations, with the Pb-going coefficients larger by about 16 ± 6%, rather independent of pT within the uncertainties of the measurement. The data are compared with calculations using the AMPT model, which predicts a different pT and η dependence than observed in the data. The results are sensitive to the parent particle v2 and composition of reconstructed muon tracks, where the contribution from heavy flavour decays is expected to dominate at pT>2 GeV/c.
Original language | English |
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Pages (from-to) | 126-139 |
Number of pages | 14 |
Journal | Physics Letters B |
Volume | 753 |
DOIs | |
State | Published - Feb 10 2016 |
Externally published | Yes |
Funding
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) Collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science , World Federation of Scientists (WFS) and Swiss Fonds Kidagan , Armenia; Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ), Financiadora de Estudos e Projetos ( FINEP ), Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP ); National Natural Science Foundation of China ( NSFC ), the Chinese Ministry of Education ( CMOE ) and the Ministry of Science and Technology of China ( MSTC ); Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community's Seventh Framework Programme ; Helsinki Institute of Physics and the Academy of Finland ; French CNRS-IN2P3 , the ‘Region Pays de Loire’, ‘Region Alsace’, ‘Region Auvergne’ and CEA , France; German Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie ( BMBF ) and the Helmholtz Association ; General Secretariat for Research and Technology , Ministry of Development , Greece; National Research, Development and Innovation Office (NKFIH), Hungary; Department of Atomic Energy and Department of Science and Technology of the Government of India; Istituto Nazionale di Fisica Nucleare ( INFN ) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Italy; Japan Society for the Promotion of Science ( JSPS ), KAKENHI and MEXT , Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea (NRF); Consejo Nacional de Cienca y Tecnologia ( CONACYT ), Direccion General de Asuntos del Personal Academico ( DGAPA ), México, Amerique Latine Formation academique – European Commission (ALFA-EC) and the EPLANET Program (European Particle Physics Latin American Network); Stichting voor Fundamenteel Onderzoek der Materie ( FOM ) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek ( NWO ), Netherlands; Research Council of Norway (NFR); National Science Centre , Poland; Ministry of National Education/Institute for Atomic Physics and National Council of Scientific Research in Higher Education (CNCSI-UEFISCDI), Romania; Ministry of Education and Science of Russian Federation , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research ; Ministry of Education of Slovakia ; Department of Science and Technology , South Africa; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), E-Infrastructure shared between Europe and Latin America ( EELA ), Ministerio de Economía y Competitividad ( MINECO ) of Spain, Xunta de Galicia (Consellería de Educación), Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear ( CEADEN ), Cubaenergía, Cuba, and IAEA (International Atomic Energy Agency); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council ( STFC ); The United States Department of Energy , the United States National Science Foundation , the State of Texas , and the State of Ohio ; Ministry of Science, Education and Sports of Croatia and Unity through Knowledge Fund , Croatia; Council of Scientific and Industrial Research ( CSIR ), New Delhi, India; Pontificia Universidad Católica del Perú .
Funders | Funder number |
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ALFA-EC | |
CMOE | |
CNCSI-UEFISCDI | |
Danish Natural Science Research Council | |
Department of Atomic Energy and Department of Science and Technology of the Government of India | |
Direccion General de Asuntos del Personal Academico ( DGAPA ), México, Amerique Latine Formation academique | |
General Secretariat for Research and Technology , Ministry of Development | |
Helsinki Institute of Physics | |
MSTC | |
Ministry of Education and Youth of the Czech Republic | |
Ministry of Education of Slovakia | |
Ministry of National Education/Institute for Atomic Physics and National Council of Scientific Research in Higher Education | |
Ministry of Science, Education and Sports of Croatia and Unity | |
NFR | |
Region Auvergne’ and CEA | |
Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations | |
State Committee of Science , World Federation | |
Swiss Fonds Kidagan | |
United Kingdom Science and Technology Facilities Council | |
Xunta de Galicia (Consellería de Educación | |
National Science Foundation | 1307461, 1407051 |
U.S. Department of Energy | |
Science and Technology Facilities Council | 2014 STFC Nuclear Physics CG, ST/M001601/1, ST/L005689/1, ALICE, ST/L005751/1, GRIDPP, ST/J000108/1, ST/L005670/1, ST/M00158X/1, ST/M001598/1 |
European Commission | |
European Research Council | |
Department of Science and Technology, Ministry of Science and Technology, India | |
Council of Scientific and Industrial Research, India | |
Japan Society for the Promotion of Science | 15H03664, 25287048, 26610071 |
Ministry of Education, Culture, Sports, Science and Technology | |
Stichting voor Fundamenteel Onderzoek der Materie | |
Danmarks Grundforskningsfond | |
Fundação de Amparo à Pesquisa do Estado de São Paulo | |
National Natural Science Foundation of China | |
Russian Foundation for Basic Research | |
Ministry of Education of the People's Republic of China | |
Academy of Finland | CNRS-IN2P3 |
Bundesministerium für Bildung und Forschung | |
Russian Academy of Sciences | |
Carlsbergfondet | |
Ministry of Science and Technology of the People's Republic of China | |
Consejo Nacional de Ciencia y Tecnología | |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
Ministerio de Economía y Competitividad | |
Ministry of Education and Science of the Russian Federation | |
Conselho Nacional de Desenvolvimento Científico e Tecnológico | |
National Research Foundation of Korea | |
Joint Institute for Nuclear Research | |
Instituto Nazionale di Fisica Nucleare | |
Knut och Alice Wallenbergs Stiftelse | |
Narodowe Centrum Nauki | |
Vetenskapsrådet | |
International Atomic Energy Agency | |
Financiadora de Estudos e Projetos | |
Seventh Framework Programme | |
Norges Forskningsråd | |
Ministry of Education and Science of Ukraine | |
Helmholtz Association | |
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas | |
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie | |
Nemzeti Kutatási Fejlesztési és Innovációs Hivatal | |
Pontificia Universidad Católica del Perú | |
Conseil Régional des Pays de la Loire | |
Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi | |
Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear |