Measurements of long-range near-side angular correlations in $\sqrt{s_{\text{NN}}}=5$TeV proton-lead collisions in the forward region

Abstract

Two-particle angular correlations are studied in proton-lead collisions at a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\text{NN}}}=5$TeV, collected with the LHCb detector at the LHC. The analysis is based on data recorded in two beam configurations, in which either the direction of the proton or that of the lead ion is analysed. The correlations are measured in the laboratory system as a function of relative pseudorapidity, $\Delta \eta$, and relative azimuthal angle, $\Delta \varphi$, for events in different classes of event activity and for different bins of particle transverse momentum. In high-activity events a long-range correlation on the near side, $\Delta \varphi \approx 0$, is observed in the pseudorapidity range $2.0<\eta <4.9$. This measurement of long-range correlations on the near side in proton-lead collisions extends previous observations into the forward region up to $\eta =4.9$. The correlation increases with growing event activity and is found to be more pronounced in the direction of the lead beam. However, the correlation in the direction of the lead and proton beams are found to be compatible when comparing events with similar absolute activity in the direction analysed.

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-040.html

References in corpus (9)

• PYTHIA 6.4 Physics and Manual
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Observation of long-range elliptic anisotropies in $\sqrt{s}=$13 and 2.76 TeV $pp$ collisions with the ATLAS detector
• Measurement of long-range near-side two-particle angular correlations in pp collisions at sqrt(s) = 13 TeV
• Correlations from hydrodynamic flow in p-Pb collisions
• Explanation of systematics of CMS p+Pb high multiplicity di-hadron data at ${\sqrt{s}}_{\mathrm{NN}}=5.02$ TeV
• Evidence for BFKL and saturation dynamics from di-hadron spectra at the LHC
• Forward-central two-particle correlations in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Ridge Formation Induced by Jets in $pp$ Collisions at 7 TeV

Cited by in corpus (66)

• Evidence for collectivity in pp collisions at the LHC
• Observation of charge-dependent azimuthal correlations in pPb collisions and its implication for the search for the chiral magnetic effect
• Heavy quarks and jets as probes of the QGP
• Open Heavy-Flavor Production in Heavy-Ion Collisions
• Measurement of multi-particle azimuthal correlations in $pp$, $p$+Pb and low-multiplicity Pb+Pb collisions with the ATLAS detector
• Experimental overview on small collision systems at the LHC
• Elliptic flow of charm and strange hadrons in high-multiplicity pPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 8.16 TeV
• Observation of correlated azimuthal anisotropy Fourier harmonics in pp and pPb collisions at the LHC
• Measurements of two-particle correlations in $e^{+}{e}^{-}$ collisions at 91 GeV with ALEPH archived data
• Observation of prompt J/$\psi$ meson elliptic flow in high-multiplicity pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 8.16 TeV
• Neutral pion and $\eta$ meson production in p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV
• Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies
• Effect of non-eikonal corrections on azimuthal asymmetries in the Color Glass Condensate
• Reconstructing the impact parameter of proton-nucleus and nucleus-nucleus collisions
• ${\rm Y}$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\sqrt{{\text{s}}_{\text{NN}}}=5.02$ TeV
• Searches for transverse momentum dependent flow vector fluctuations in Pb-Pb and p-Pb collisions at the LHC
• Observables for possible QGP signatures in central pp collisions
• Multi-Parton Interactions in pp collisions from Machine Learning-based regression
• Pseudorapidity and transverse momentum dependence of flow harmonics in pPb and PbPb collisions
• Bose-Einstein correlations of charged hadrons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Directed flow from C-odd gluon correlations at small $x$
• Quark correlations in the Color Glass Condensate: Pauli blocking and the ridge
• Novel observables for exploring QCD collective evolution and quantum entanglement within individual jets
• Multiparticle correlation studies in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 8.16 TeV
• Correlations and the ridge in the Color Glass Condensate beyond the glasma graph approximation
• Multi-particle production in proton-nucleus collisions in the Color Glass Condensate
• Probing the chiral magnetic wave in pPb and PbPb collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=$ 5.02 TeV using charge-dependent azimuthal anisotropies
• Two-particle azimuthal correlations in $\gamma$p interactions using pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at $\sqrt{s}$ = 13 TeV
• Long-range near-side correlation in $e^{+}{e}^{-}$ Collisions at 183-209 GeV with ALEPH Archived Data
• Nuclear modification factor of neutral pions in the forward and backward regions in $p$-Pb collisions
• Collective flow from AA, pA to pp collisions - Toward a unified paradigm
• Ratios of jet and hadron spectra at LHC energies: measuring high-$p_T$ suppression without a $pp$ reference
• Production of $\Lambda$ and ${\mathrm{K}}_{\mathrm{S}}^0$ in jets in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV
• Gluon density fluctuations in dilute hadrons
• Observation of $\Lambda$ hyperon local polarization in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Measurement of Two-Particle Correlations of Hadrons in $e^{+}{e}^{-}$ Collisions at Belle
• Nonperturbative transverse momentum broadening in dihadron angular correlations in $\sqrt{s_{NN}}=200$ GeV proton-nucleus collisions
• Measurements of azimuthal anisotropies at forward and backward rapidity with muons in high-multiplicity p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Model study on ${\rm Y}(nS)$ modification in small collision systems
• Correlations of azimuthal anisotropy Fourier harmonics with subevent cumulants in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 8.16 TeV
• Evidence for similar collectivity of high transverse momentum particles in pPb and PbPb collisions
• Study of azimuthal anisotropy of ${\rm Y}$(1S) mesons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Particle production and flow-like effects in small systems
• Signature of gluon saturation in forward di-hadron correlations at the Large Hadron Collider
• Particle production as a function of charged-particle flattenicity in pp collisions at $\sqrt{s}$ = 13 TeV
• Investigating the broadening phenomenon in two-particle correlations induced by gluon saturation
• Production of $\eta$ and ${\eta }^{\prime }$ mesons in $pp$ and $p$Pb collisions
• Search for nuclear modifications of B${}^{+}$ meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• New results on collectivity with LHCb
• Observation of long-range collective flow in OO and NeNe collisions and implications for nuclear structure studies
• Elliptic anisotropy measurement of the f${}_0$(980) hadron in proton-lead collisions and evidence for its quark-antiquark composition
• Measurement of forward charged hadron flow harmonics in peripheral PbPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the LHCb detector
• Investigating nonflow contribution subtraction in d-Au collisions with AMPT model
• Mapping the internal structure of hadrons through color and spin effects
• Multiplicity dependence of charm baryon and charm meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Directed flow from parton spin-orbit coupling in $pp$ and $pA$ collisions
• Long-range azimuthal correlations for partially coherent pion emission in proton-proton collisions
• Squeezed back-to-back correlations of $K^{+}$$K^{-}$ in d+Au collisions at $\sqrt{s_{NN}}=200$ GeV and Au+Au collisions at $\sqrt{s_{NN}}=62.4$ GeV
• Exploring hidden sectors with two-particle angular correlations at future $e^{+}{e}^{-}$ colliders
• Ridges in p-A (and pp) collisions
• Impact of soft QCD effects over intrajet azimuthal anisotropies
• Suppression of elliptic anisotropy inside jets: A new perspective for jet quenching
• Energy loss of heavy-flavor quarks in color string medium
• Implications of correlations and fluctuations in small systems
• Highlights from the LHCb experiment