Femtoscopy with identified charged pions in proton-lead collisions at √sNN =5.02 TeV with ATLAS

ATLAS Collaboration

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Bose-Einstein correlations between identified charged pions are measured for p+Pb collisions at sNN=5.02TeV using data recorded by the ATLAS detector at the CERN Large Hadron Collider corresponding to a total integrated luminosity of 28nb-1. Pions are identified using ionization energy loss measured in the pixel detector. Two-particle correlation functions and the extracted source radii are presented as a function of collision centrality as well as the average transverse momentum (kT) and rapidity (yππ) of the pair. Pairs are selected with a rapidity -2<yππ<1 and with an average transverse momentum 0.1<kT<0.8GeV. The effect of jet fragmentation on the two-particle correlation function is studied, and a method using opposite-charge pair data to constrain its contributions to the measured correlations is described. The measured source sizes are substantially larger in more central collisions and are observed to decrease with increasing pair kT. A correlation of the radii with the local charged-particle density is demonstrated. The scaling of the extracted radii with the mean number of participating nucleons is also used to compare a selection of initial-geometry models. The cross term Rol is measured as a function of rapidity, and a nonzero value is observed with 5.1σ combined significance for -1<yππ<1 in the most central events.

Original languageEnglish
Article number064908
JournalPhysical Review C
Volume96
Issue number6
DOIs
StatePublished - 28 Dec 2017

Funding

FundersFunder number
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
Agence Nationale de la Recherche
Australian Research Council
Centre National pour la Recherche Scientifique et Technique
Fundação para a Ciência e a Tecnologia
Comisión Nacional de Investigación Científica y Tecnológica
Narodowe Centrum Nauki
Région Auvergne
CEA-DSM
Japan Society for the Promotion of Science
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministry of Science and Technology, Taiwan
Israel Science Foundation
Wallenberg Foundation
Arizona-Nevada Academy of Science
Javna Agencija za Raziskovalno Dejavnost RS
VSC CR, Czech Republic
Generalitat de Catalunya
Instituto Nazionale di Fisica Nucleare
Bundesministerium für Wissenschaft, Forschung und Wirtschaft
Austrian Science Fund
Department of Science and Technology, Ministry of Science and Technology, India
MSMT
MSSR
Ministerio de Economía y Competitividad
Bundesministerium für Bildung und Forschung
Canada Foundation for Innovation
Helmholtz-Gemeinschaft
Danmarks Grundforskningsfond
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Singapore Eye Research Institute
MIZŠ
Deutsche Forschungsgemeinschaft
United States-Israel Binational Science Foundation
MESTD
U.S. Department of Energy
EU-ESF
RGC
Fundação de Amparo à Pesquisa do Estado de São Paulo
Biomedical Research Foundation
MES of Russia
National Research Center "Kurchatov Institute"
Institutul de Fizică Atomică
Natural Sciences and Engineering Research Council of Canada
General Secretariat for Research and Technology
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Cantons of Bern and Geneva
Chinese Academy of Sciences
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Glycemic Index Foundation
Shota Rustaveli National Science Foundation
MNE
Agencia Nacional de Promoción Científica y Tecnológica
Minerva Foundation
National Research Foundation
Ministerstwo Nauki i Szkolnictwa Wyższego
IRFU
Generalitat Valenciana
CERN
Joint Institute for Nuclear Research
Fondation Partager le Savoir
National Research Council Canada
Alexander von Humboldt-Stiftung
Council on grants of the President of the Russian Federation
Royal Society and Lev-erhulme Trust
Ministry of Education, Culture, Sports, Science and Technology
National Natural Science Foundation of China
Science and Technology Facilities CouncilST/K001574/1, PP/E000452/1, ST/H001158/1, ST/N000234/1, ST/N000331/1, ST/H001158/2, ST/N000277/1, GRIDPP, ST/I006145/1
DNSRCIN2P3-CNRS
National Science Foundation1624739

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