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Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC
Baringer, Philip S. Bean, Alice Benelli, Gabriele Grachov, Oleg A. Murray, Michael J. Noonan, Danny Radicci, Valeria Sanders, Stephen J. Wood, Jeffrey Scott Zhukova, Victoria
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Grachov, Oleg A.
Murray, Michael J.
Noonan, Danny
Radicci, Valeria
Sanders, Stephen J.
Wood, Jeffrey Scott
Zhukova, Victoria
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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 (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.
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This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP09%282010%29091.
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2010-09-27
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Springer-Verlag
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Baringer_9-27-2010.pdf
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Khachatryan, V. et al. (2010). "Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC." Journal of High Energy Physics, 09(2010):091. http://www.dx.doi.org/10.1007/JHEP09(2010)091.