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Evidence for collectivity in pp collisions at the LHC

Journal articles  - Journal Article
Sirunyan, AM; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Erö, J; Escalante Del Valle, A; Frühwirth, R; Jeitler, M; Krammer, N; Liko, D ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
February 10, 2017
Published version (DOI)

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.

Duke Scholars

Seog Oh
Author Seog Oh Physics
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Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2016.12.009

ISSN

0370-2693

Publication Date

February 10, 2017

Volume

765

Start / End Page

193 / 220

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
 

Citation

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Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., … Alves, G. A. (2017). Evidence for collectivity in pp collisions at the LHC. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 765, 193–220. https://doi.org/10.1016/j.physletb.2016.12.009
Sirunyan, A. M., A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, A. Escalante Del Valle, et al. “Evidence for collectivity in pp collisions at the LHC.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 765 (February 10, 2017): 193–220. https://doi.org/10.1016/j.physletb.2016.12.009.
Sirunyan AM, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, et al. Evidence for collectivity in pp collisions at the LHC. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2017 Feb 10;765:193–220.
Sirunyan, A. M., et al. “Evidence for collectivity in pp collisions at the LHC.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 765, Feb. 2017, pp. 193–220. Scopus, doi:10.1016/j.physletb.2016.12.009.
Sirunyan AM, Tumasyan A, Adam W, Bergauer T, Dragicevic M, Erö J, Escalante Del Valle A, Frühwirth R, Jeitler M, Krammer N, Lechner L, Liko D, Madlener T, Mikulec I, Pitters FM, Rad N, Schieck J, Schöfbeck R, Spanring M, Templ S, Waltenberger W, Wulz CE, Zarucki M, Chekhovsky V, Litomin A, Makarenko V, Suarez Gonzalez J, Darwish MR, de Wolf EA, Di Croce D, Janssen X, Kello T, Lelek A, Pieters M, Rejeb Sfar H, van Haevermaet H, van Mechelen P, van Putte S, van Remortel N, Blekman F, Bols ES, Chhibra SS, D’Hondt J, de Clercq J, Lontkovskyi D, Lowette S, Marchesini I, Moortgat S, Morton A, Python Q, Tavernier S, van Doninck W, van Mulders P, Beghin D, Bilin B, Clerbaux B, de Lentdecker G, Dorney B, Favart L, Grebenyuk A, Kalsi AK, Makarenko I, Moureaux L, Pétré L, Popov A, Postiau N, Starling E, Thomas L, Vander Velde C, Vanlaer P, Vannerom D, Wezenbeek L, Cornelis T, Dobur D, Gruchala M, Khvastunov I, Niedziela M, Roskas C, Skovpen K, Tytgat M, Verbeke W, Vermassen B, Vit M, Bruno G, Bury F, Caputo C, David P, Delaere C, Delcourt M, Donertas IS, Giammanco A, Lemaitre V, Mondal K, Prisciandaro J, Taliercio A, Teklishyn M, Vischia P, Wertz S, Wuyckens S, Alves GA. Evidence for collectivity in pp collisions at the LHC. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2017 Feb 10;765:193–220.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2016.12.009

ISSN

0370-2693

Publication Date

February 10, 2017

Volume

765

Start / End Page

193 / 220

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences