## “School of Particles”

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Paper   IPM / Particles / 11565
School of Particles and Accelerator
Title:   Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
Author(s):
 1 Hessamaddin Arfaei 2 Hamed Bakhshiansohi 3 Seyed Mohsen Etesami 4 Ali Fahim 5 Majid Hashemi 6 Abideh Jafari 7 Mohsen Khakzad 8 A Mohammadi 9 Mojtaba Mohammadi Najafabadi 10 Saeid Paktinat Mehdiabadi 11 Batool Safarzadeh 12 Maryam Zeinali
Status:   Published
Journal: JHEP
No.:  091
Vol.:  1009
Year:  2010
Pages:   34
Supported by:  IPM
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 (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple ïndependent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 inverse nb data set at 7 TeV. In high multiplicity events, a pronounced structure emerges in the two-dimensional correlation function for particle pairs with intermediate transverse momentum of 1-3 GeV/c, 2.0< - Delta(eta) - <4.8 and Delta(phi) near 0. This is the first observation of such a long-range, near-side feature in two-particle correlation functions in pp or p p-bar collisions.

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