Results on two-particle angular correlations for charged particles produced in pp collisions at a center- of-mass energy of 13 TeV 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 (pT). 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 < pT < 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 √s = 7 TeV. 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. The observed long- range correlations are compared to those seen in pp, pPb, and PbPb collisions at lower collision energies.

Measurement of Long-Range Near-Side Two-Particle Angular Correlations in pp Collisions at √s =13 TeV

SOLA, VALENTINA;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;
2016-01-01

Abstract

Results on two-particle angular correlations for charged particles produced in pp collisions at a center- of-mass energy of 13 TeV 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 (pT). 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 < pT < 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 √s = 7 TeV. 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. The observed long- range correlations are compared to those seen in pp, pPb, and PbPb collisions at lower collision energies.
2016
116
17
1
19
http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.116.172302/apsxml
Physics and Astronomy (all)
Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1639571
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