Evidence for collectivity in pp collisions at the LHC

CMS Collaboration

doi:10.1016/j.physletb.2016.12.009

Evidence for collectivity in pp collisions at the LHC

CMS Collaboration

Yerevan Physics Institute
Institut für Hochenergiephysik
Vienna University of Technology
Institute for Nuclear Problems of Belarusian State University
University of Antwerp
Technology and Maritime Transport
Université Libre de Bruxelles
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University of Rome
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Vrjie Universiteit Brussel
Ghent University
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University of Louvain
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Universidade Federal do Rio Grande do Sul
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São Paulo State University
Federal University of ABC (UFABC)
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
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Beihang University
Tsinghua University
Institute of High Energy Physics, Chinese Academy of Sciences
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State Key Laboratory of Nuclear Physics and Technology
Sun Yat-Sen University
Fudan University
Zhejiang University
Universidad de Los Andes, Colombia
Universidad de Antioquia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Faculty of Science, University of Split
Ruđer Bošković Institute
Institute for Theoretical and Experimental Physics
University of Cyprus
Charles University
Joint Institute for Nuclear Research, Dubna
Escuela Politecnica Nacional
Universidad San Francisco de Quito
Egyptian Network of High Energy Physics
Ain Shams University
Zewail City of Science and Technology
British University in Egypt
Fayoum University
National Institute of Chemical Physics and Biophysics, Tallinn
University of Helsinki
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Purdue University
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Georgian Technical University
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Isfahan University of Technology
Joint Faculty of the Brandenburg University of Technology Cottbus Senftenberg
Institute of Meteorology and Climate Research
European Organization for Nuclear Research
Moscow State University
Institute of Nuclear Physics Demokritos
University of Athens
National Technical University of Athens
University of Ioannina
Eötvös Loránd University
University of Debrecen
Faculty of Science
Wigner Research Centre for Physics
Institute of Nuclear Research ATOMKI
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Indian Institute of Science
National Institute of Science Education and Research
IIT Bhubaneswar
Institute of Physics Bhubaneswar
Panjab University
G.H.G. Khalsa College
University of Delhi
Saha Institute of Nuclear Physics
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Bhabha Atomic Research Centre
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Tata Institute of Fundamental Research, Mumbai
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Sharif University of Technology
Institute for Research in Fundamental Sciences (IPM)
University of Science and Technology of Mazandaran, Behshahr
University College Dublin
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Politecnico di Bari
INFN Sezione di Bologna
University of Bologna
ENEA Climate Modeling and Impacts
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Università degli Studi di Catania
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Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Florence
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National Centre for Nuclear Research
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Warsaw University of Technology
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Institute for Nuclear Research of the Russian Academy of Sciences
National Research Nuclear University MEPhI
Petersburg Nuclear Physics Institute (PNPI)
St. Petersburg State Polytechnical University
University of Florida
Imperial College London
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
California Institute of Technology
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Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
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Hacettepe University
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Women and Infants Hospital of Rhode Island-Warren Alpert Medical School of Brown University
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Research output: Contribution to journal › Article › peer-review

Abstract

Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb⁻¹ (5 TeV), 6.2pb⁻¹ (7 TeV), and 0.7pb⁻¹ (13 TeV), were collected using the CMS detector at the LHC. The second-order (v₂) and third-order (v₃) azimuthal anisotropy harmonics of unidentified charged particles, as well as v₂ of K_S ⁰ and Λ/Λ‾ particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v₂ values of charged hadrons (mostly pions), K_S ⁰, and Λ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below p_T≈2GeV/c. For 13 TeV data, the v₂ signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

Original language	English
Pages (from-to)	193-220
Number of pages	28
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	765
DOIs	https://doi.org/10.1016/j.physletb.2016.12.009
Publication status	Published - 10 Feb 2017

Keywords

CMS
Correlation
Heavy ion
Physics
Ridge
pp

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10.1016/j.physletb.2016.12.009

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@article{e5dfc7b9b644418ba9b32fc4d638ace8,

title = "Evidence for collectivity in pp collisions at the LHC",

abstract = "Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb−1 (5 TeV), 6.2pb−1 (7 TeV), and 0.7pb−1 (13 TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2 of KS 0 and Λ/Λ‾ particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2 values of charged hadrons (mostly pions), KS 0, and Λ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2GeV/c. For 13 TeV data, the v2 signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.",

keywords = "CMS, Correlation, Heavy ion, Physics, Ridge, pp",

author = "\{CMS Collaboration\} and Sirunyan, \{A. M.\} and A. Tumasyan and W. Adam and T. Bergauer and M. Dragicevic and J. Er{\"o} and \{Escalante Del Valle\}, A. and R. Fr{\"u}hwirth and M. Jeitler and N. Krammer and L. Lechner and D. Liko and T. Madlener and I. Mikulec and Pitters, \{F. M.\} and N. Rad and J. Schieck and R. Sch{\"o}fbeck and M. Spanring and S. Templ and W. Waltenberger and Wulz, \{C. E.\} and M. Zarucki and V. Chekhovsky and A. Litomin and V. Makarenko and \{Suarez Gonzalez\}, J. and Darwish, \{M. R.\} and \{de Wolf\}, \{E. A.\} and \{Di Croce\}, D. and X. Janssen and T. Kello and A. Lelek and M. Pieters and \{Rejeb Sfar\}, H. and \{van Haevermaet\}, H. and \{van Mechelen\}, P. and F. Beaudette and O. Davignon and \{Granier de Cassagnac\}, R. and M. Nguyen and C. Ochando and P. Paganini and R. Salerno and Sauvan, \{J. B.\} and Y. Sirois and A. Zabi and A. Zghiche and \{de Wit\}, A. and A. Cappati",

note = "Publisher Copyright: {\textcopyright} 2016 The Author",

year = "2017",

month = feb,

day = "10",

doi = "10.1016/j.physletb.2016.12.009",

language = "English",

volume = "765",

pages = "193--220",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

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TY - JOUR

T1 - Evidence for collectivity in pp collisions at the LHC

AU - CMS Collaboration

AU - Sirunyan, A. M.

AU - Tumasyan, A.

AU - Adam, W.

AU - Bergauer, T.

AU - Dragicevic, M.

AU - Erö, J.

AU - Escalante Del Valle, A.

AU - Frühwirth, R.

AU - Jeitler, M.

AU - Krammer, N.

AU - Lechner, L.

AU - Liko, D.

AU - Madlener, T.

AU - Mikulec, I.

AU - Pitters, F. M.

AU - Rad, N.

AU - Schieck, J.

AU - Schöfbeck, R.

AU - Spanring, M.

AU - Templ, S.

AU - Waltenberger, W.

AU - Wulz, C. E.

AU - Zarucki, M.

AU - Chekhovsky, V.

AU - Litomin, A.

AU - Makarenko, V.

AU - Suarez Gonzalez, J.

AU - Darwish, M. R.

AU - de Wolf, E. A.

AU - Di Croce, D.

AU - Janssen, X.

AU - Kello, T.

AU - Lelek, A.

AU - Pieters, M.

AU - Rejeb Sfar, H.

AU - van Haevermaet, H.

AU - van Mechelen, P.

AU - Beaudette, F.

AU - Davignon, O.

AU - Granier de Cassagnac, R.

AU - Nguyen, M.

AU - Ochando, C.

AU - Paganini, P.

AU - Salerno, R.

AU - Sauvan, J. B.

AU - Sirois, Y.

AU - Zabi, A.

AU - Zghiche, A.

AU - de Wit, A.

AU - Cappati, A.

PY - 2017/2/10

Y1 - 2017/2/10

N2 - Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb−1 (5 TeV), 6.2pb−1 (7 TeV), and 0.7pb−1 (13 TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2 of KS 0 and Λ/Λ‾ particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2 values of charged hadrons (mostly pions), KS 0, and Λ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2GeV/c. For 13 TeV data, the v2 signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

AB - Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb−1 (5 TeV), 6.2pb−1 (7 TeV), and 0.7pb−1 (13 TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2 of KS 0 and Λ/Λ‾ particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2 values of charged hadrons (mostly pions), KS 0, and Λ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2GeV/c. For 13 TeV data, the v2 signals are also extracted from four- and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

KW - CMS

KW - Correlation

KW - Heavy ion

KW - Physics

KW - Ridge

KW - pp

UR - https://www.scopus.com/pages/publications/85007251845

U2 - 10.1016/j.physletb.2016.12.009

DO - 10.1016/j.physletb.2016.12.009

M3 - Article

AN - SCOPUS:85007251845

SN - 0370-2693

VL - 765

SP - 193

EP - 220

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Evidence for collectivity in pp collisions at the LHC

Abstract

Keywords

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