Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/13846
Title: Evidence for collectivity in pp collisions at the LHC
Authors: Khachatryan, V
Sirunyan, AM
Tumasyan, A
Adam, W
Asilar, E
Bergauer, T
Brandstetter, J
Brondolin, E
Dragicevic, M
Erö, J
Flechl, M
Friedl, M
Frühwirth, R
Ghete, VM
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, CE
Mossolov, V
Shumeiko, N
Suarez Gonzalez, J
Alderweireldt, S
De Wolf, EA
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
Keywords: CMS;Physics;Heavy ion;Ridge;Correlation;PP
Issue Date: 2017
Publisher: Elsevier
Citation: Physics Letters, Section B, 765: pp. 193 - 220, (2017)
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.
URI: http://bura.brunel.ac.uk/handle/2438/13846
DOI: http://dx.doi.org/10.1016/j.physletb.2016.12.009
ISSN: 0370-2693
Appears in Collections:Dept of Electronic and Computer Engineering Research Papers

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