CERN Accelerating science

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Title Long-Range Near-Side Angular Correlations in Proton-Proton Interactions in CMS.
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Author(s) Tonelli, Guido (speaker) (Universita' di Pisa, INFN, CERN) ; Roland, Gunther (speaker) (Massachusetts Institute of Technology (MIT))
Corporate author(s) CERN. Geneva
Imprint 2010-09-21. - Streaming video, 01:25:59:00.
Series (CERN Joint EP/PP & LPCC/EP/PP Seminar)
Lecture note on 2010-09-21T17:00:00
Subject category CERN Joint EP/PP & LPCC/EP/PP Seminar
Abstract The CMS Collaboration 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 7TeV over a broad range of pseudorapidity (η) and azimuthal angle (φ) are presented using data collected with the CMS detector at the LHC. Short-range correlations in ∆η, which are studied in minimum bias events, are characterized using a simple independent cluster parameterization in order to quantify their strength (cluster size) and their extent in η (cluster decay width). Long-range azimuthal correlations are studied more differentially as a function of charged particle multiplicity and particle transverse momentum using a 980nb−1 data set at 7TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particles in intermediate pT’s of 1-3GeV/c, 2.0< |∆η|<4.8 and ∆φ≈0. This is the first observation of such a ridge-like feature in two-particle correlation functions in pp or p-pbar collisions.

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 Record created 2010-09-21, last modified 2022-11-02


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