Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC

CMS Collaboration; Philip S Baringer; Alice Bean; Gabriele Benelli; Oleg A Grachov; Michael J Murray; Danny Noonan; Valeria Radicci; Stephen J Sanders; Jeffrey Scott Wood; Victoria Zhukova; V Khachatryan; A. M Sirunyan; A Tumasyan; W Adam; T Bergauer; Yasar Onel

doi:10.1007/JHEP09(2010)091

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Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC

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Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC

CMS Collaboration, Philip S Baringer, Alice Bean, Gabriele Benelli, Oleg A Grachov, Michael J Murray, Danny Noonan, Valeria Radicci, Stephen J Sanders, Jeffrey Scott Wood, …

Journal of high energy physics : JHEP, Vol.2010(9), 91

09/27/2010

DOI: 10.1007/JHEP09(2010)091

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Abstract

This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP09%282010%29091. 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 (η) and azimuthal angle (ϕ). Short-range correlations in Δη, 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 η (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 < |Δη| < 4.8 and Δϕ ≈ 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or pp-bar collisions.

Details

Title: Subtitle: Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
Creators: CMS Collaboration
Philip S Baringer
Alice Bean
Gabriele Benelli
Oleg A Grachov
Michael J Murray
Danny Noonan
Valeria Radicci
Stephen J Sanders
Jeffrey Scott Wood
Victoria Zhukova
V Khachatryan
A. M Sirunyan
A Tumasyan
W Adam
T Bergauer
Yasar Onel - Physics and Astronomy
Resource Type: Journal article
Publication Details: Journal of high energy physics : JHEP, Vol.2010(9), 91
Publisher: Springer-Verlag
DOI: 10.1007/JHEP09(2010)091
ISSN: 1126-6708
eISSN: 1029-8479
Language: English
Date published: 09/27/2010
Academic Unit: Physics and Astronomy
Record Identifier: 9984428677802771

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