Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
- V. Khachatryan
- A. M. Sirunyan
- A. Tumasyan
- W. Adam
- T. Bergauer
- M. Dragicevic
- J. Erö
- C. Fabjan
- M. Friedl
- R. Frühwirth
- V. M. Ghete
- J. Hammer
- S. Hänsel
- C. Hartl
- M. Hoch
- N. Hörmann
- J. Hrubec
- M. Jeitler
- G. Kasieczka
- W. Kiesenhofer
- M. Krammer
- D. Liko
- I. Mikulec
- M. Pernicka
- H. Rohringer
- R. Schöfbeck
- J. Strauss
- A. Taurok
- F. A. Teischinger
- W. Waltenberger
- G. Walzel
- E. Widl
- C.-E. Wulz
- V. Mossolov
- N. Shumeiko
- J. Suarez Gonzalez
- L. Benucci
- L. Ceard
- E. A. De Wolf
- X. Janssen
- T. Maes
- L. Mucibello
- S. Ochesanu
- B. Roland
- R. Rougny
- M. Selvaggi
- H. Van Haevermaet
- P. Van Mechelen
- N. Van Remortel
- V. Adler
- S. Beauceron
- S. Blyweert
- J. D’Hondt
- O. Devroede
- A. Kalogeropoulos
- J. Maes
- M. Maes
- S. Tavernier
- W. Van Doninck
- P. Van Mulders
- I. Villella
- E. C. Chabert
- O. Charaf
- B. Clerbaux
- G. De Lentdecker
- V. Dero
- A. P. R. Gay
- G. H. Hammad
- T. Hreus
- P. Marage
- C. Vander Velde
- P. Vanlaer
- J. Wickens
- S. Costantini
- M. Grünewald
- B. Klein
- A. Marinov
- D. Ryckbosch
- F. Thyssen
- M. Tytgat
- L. Vanelderen
- P. Verwilligen
- S. Walsh
- N. Zaganidis
- S. Başeğmez
- G. Bruno
- J. Caudron
- J. De Favereau De Jeneret
- C. Delaere
- P. Demin
- D. Favart
- A. Giammanco
- G. Grégoire
- J. Hollar
- V. Lemaı̂tre
- O. Militaru
- S. Ovyn
- D. Pagano
- A. Pin
- K. Piotrzkowski
- AMA. Meyer
- STS. Tosi
- GAG. A. Alves
- LML. Mundim
- AMA. Meyer
- STS. Tosi
- GAG. A. Alves
- LML. Mundim
- SNSergio Ferraz Novaes
- JSJ. B. Singh
- SPSandra S. Padula
Journal of High Energy Physics · 2010 · Springer Nature
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Abstract
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity () and azimuthal angle (). Short-range correlations in , which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 nb -1 data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate p T of 1-3 GeV/c, 2.0 < || < 4.8 and 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or pp collisions.