Title
Evidence for collectivity in pp collisions at the LHC
Date Issued
10 February 2017
Access level
open access
Resource Type
journal article
Author(s)
Khachatryan V.
Sirunyan A.M.
Tumasyan A.
Adam W.
Asilar E.
Bergauer T.
Brandstetter J.
Brondolin E.
Dragicevic M.
Erö J.
Flechl M.
Friedl M.
Frühwirth R.
Ghete V.M.
Hartl C.
Hörmann N.
Hrubec J.
Jeitler M.
König A.
Krätschmer I.
Liko D.
Matsushita T.
Mikulec I.
Rabady D.
Rad N.
Rahbaran B.
Rohringer H.
Schieck J.
Strauss J.
Treberer-Treberspurg W.
Waltenberger W.
Wulz C.E.
Mossolov V.
Shumeiko N.
Suarez Gonzalez J.
Alderweireldt S.
De Wolf E.A.
Janssen X.
Lauwers J.
Van De Klundert M.
Van Haevermaet H.
Van Mechelen P.
Van Remortel N.
Van Spilbeeck A.
Abu Zeid S.
Blekman F.
D'Hondt J.
Daci N.
De Bruyn I.
Deroover K.
Heracleous N.
Lowette S.
Moortgat S.
Moreels L.
Olbrechts A.
Python Q.
Tavernier S.
Van Doninck W.
Van Mulders P.
Van Parijs I.
Brun H.
Caillol C.
Clerbaux B.
De Lentdecker G.
Delannoy H.
Fasanella G.
Favart L.
Goldouzian R.
Grebenyuk A.
Karapostoli G.
Lenzi T.
Léonard A.
Luetic J.
Maerschalk T.
Marinov A.
Randle-conde A.
Seva T.
Vander Velde C.
Vanlaer P.
Yonamine R.
Zenoni F.
Zhang F.
Cimmino A.
Cornelis T.
Dobur D.
Fagot A.
Garcia G.
Gul M.
Poyraz D.
Salva S.
Schöfbeck R.
Sharma A.
Tytgat M.
Van Driessche W.
Yazgan E.
Zaganidis N.
Bakhshiansohi H.
Beluffi C.
Bondu O.
Brochet S.
Publisher(s)
Elsevier B.V.
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 KS0 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), KS0, 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.
Start page
193
End page
220
Volume
765
Language
English
OCDE Knowledge area
Física de partículas, Campos de la Física
Física atómica, molecular y química
Subjects
Scopus EID
2-s2.0-85007251845
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN of the container
03702693
Sponsor(s)
Individuals have received support from the Marie-Curie program and the European Research Council and EPLANET (European Union); the Leventis Foundation; the Alfred P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS program of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund, the Mobility Plus program of the Ministry of Science and Higher Education, the OPUS program contract 2014/13/B/ST2/02543 and contract Sonata-bis DEC-2012/07/E/ST2/01406 of the National Science Center (Poland); the Thalis and Aristeia programs cofinanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Programa Clarín-COFUND del Principado de Asturias; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); and the Welch Foundation, contract C-1845.
Sources of information:
Directorio de Producción Científica
Scopus