Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Abstract

A phenomenological analysis is presented of recent two-particle angular correlation data on relative pseudorapidity ($\eta$) and azimuth reported by the Compact Muon Solenoid (CMS) Collaboration for $\sqrt{s}$ = 7 TeV proton-proton collisions. The data are described with an empirical jet-like model developed for similar angular correlation measurements obtained from heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). The same-side (small relative azimuth), $\eta$-extended correlation structure, referred to as the {\em ridge}, is compared with three phenomenological correlation structures suggested by theoretical analysis. These include additional angular correlations due to soft gluon radiation in $2\to 3$ partonic processes, a one-dimensional same-side correlation ridge on azimuth motivated for example by color-glass condensate models, and an azimuth quadrupole similar to that required to describe heavy ion angular correlations. The quadrupole model provides the best overall description of the CMS data, including the ridge, based on ${\chi }^2$ minimization in agreement with previous studies. Implications of these results with respect to possible mechanisms for producing the CMS same-side correlation ridge are discussed.

11 pages, 2 figures, 1 table

References in corpus (20)

• The Color Glass Condensate
• Observation of Long-Range Near-Side Angular Correlations in Proton-Proton Collisions at the LHC
• Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
• Hydrodynamic Models for Heavy Ion Collisions
• The ridge in proton-proton collisions at the LHC
• Centrality dependence of charged hadron and strange hadron elliptic flow from sqrt(s_NN) = 200 GeV Au+Au collisions
• The "Ridge" in Proton-Proton Scattering at 7 TeV
• Measuring Shear Viscosity Using Transverse Momentum Correlations in Relativistic Nuclear Collisions
• On the Origin of the "Ridge" phenomenon induced by Jets in Heavy Ion Collisions
• Elliptic flow in proton-proton collisions at 7 TeV
• Cluster properties from two-particle angular correlations in p+p collisions at $\sqrt{s}$ = 200 and 410 GeV
• Azimuthal Asymmetry of pions in pp and pA collisions
• Evolution of minimum-bias parton fragmentation in nuclear collisions
• Centrality evolution of $p_t$ and $y_t$ spectra from Au-Au collisions at $\sqrt{s_{NN}}=200$ GeV
• Ridge Structure associated with the Near-Side Jet in the (Delta phi)-(Delta eta) Correlation
• The RHIC azimuth quadrupole: "perfect liquid" or gluonic radiation?
• Ridge Formation Induced by Jets in $pp$ Collisions at 7 TeV
• Azimuth Quadrupole Systematics in Au-Au Collisions
• Anisotropic flows from initial state of a fast nucleus
• Gluon correlations in the glasma

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• Possible Implication of a Single Nonextensive $p_T$ Distribution for Hadron Production in High-Energy $pp$ Collisions
• Photon-jet ridge at RHIC and the LHC
• Di-photon "Ridge" in p+p and p+A collisions at RHIC and the LHC
• On the rapidity dependence of the average transverse momentum in hadronic collisions
• Signature of the Fragmentation of a Color Flux Tube
• Azimuthal quadrupole correlation from gluon interference in 200 GeV and 7 TeV p+p collisions
• Event-by-Event Study of Space-Time Dynamics in Flux-Tube Fragmentation