Abstract
Results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13TeV are presented. The data were taken with the CMS detector at the LHC and correspond to an integrated luminosity of about 270 nb^{-1}. The correlations are studied over a broad range of pseudorapidity (|η|<2.4) and over the full azimuth (ϕ) as a function of charged particle multiplicity and transverse momentum (p_{T}). In high-multiplicity events, a long-range (|Δη|>2.0), near-side (Δϕ≈0) structure emerges in the two-particle Δη-Δϕ correlation functions. The magnitude of the correlation exhibits a pronounced maximum in the range 1.0<p_{T}<2.0 GeV/c and an approximately linear increase with the charged particle multiplicity, with an overall correlation strength similar to that found in earlier pp data at sqrt[s]=7 TeV. The present measurement extends the study of near-side long-range correlations up to charged particle multiplicities N_{ch}∼180, a region so far unexplored in pp collisions. The observed long-range correlations are compared to those seen in pp, pPb, and PbPb collisions at lower collision energies.
Highlights
Results on two-particle angular correlations for charged particles produced in pp collisions at a centerof-mass energy of 13 TeV are presented
The correlations are studied over a broad range of pseudorapidity and over the full azimuth (φ) as a function of charged particle multiplicity and transverse momentum
In high-multiplicity events, a long-range, near-side (Δφ ≈ 0) structure emerges in the two-particle Δη–Δφ correlation functions
Summary
(Received 11 October 2015; revised manuscript received 25 March 2016; published 27 April 2016). The correlations are studied over a broad range of pseudorapidity (jηj < 2.4) and over the full azimuth (φ) as a function of charged particle multiplicity and transverse momentum (pT). The present measurement extends the study of near-side long-range correlations up to charged particle multiplicities Nch ∼ 180, a region so far unexplored in pp collisions. As the average number of pp interactions per bunch crossing is small in the present data, minimum bias (MB) pp events were selected online by requiring that two proton bunches collide near the center of the CMS detector. The present analysis is based on a sample of events with high-purity primary tracks [29] originating from the pp interaction To obtain this sample, additional requirements are applied.
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