# Long-Range Near-Side Angular Correlations in Proton-Proton Interactions in CMS.

- Institution: CERN
- Department: CERN Joint EP/PP & LPCC/EP/PP Seminar
- Taught by: Guido Tonelli, Gunther Roland
- Year: 2010
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3008456)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

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.

EVO Universe, password "seminar"; Phone Bridge ID: 2330444 Password: 5142.

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## Lectures

1. [Long-Range Near-Side Angular Correlations in Proton-Proton Interactions in CMS.](https://invisiblenetwork.ai/learn/cern/3008456/b4b2b0f6dd14), 1 h 26 min (CERN's player)