Photon-jet ridge at RHIC and the LHC

Abstract

We investigate long range rapidity correlations of pairs of prompt photon and jet in the Color Glass Condensate (CGC) framework in proton-proton and proton-nucleus collisions at RHIC and the LHC. We show that photon-jet correlations exhibit long-range azimuthal collimation at near-side for low transverse momenta of the produced photon and jet in high-multiplicity events. These ridge-like features are strikingly similar to the observed ridge effect for di-hadron correlations at RHIC and the LHC. We show that correlations in the relative rapidity and the relative azimuthal angle between pairs of prompt photon and jet strongly depend on the gluon saturation dynamics at small-x kinematics and such measurements can help to understand the true origin of the observed di-hadron ridge in p+A collisions, and address whether the ridge is a universal phenomenon for all two particle correlations at high energy and high multiplicity events. We also investigate if there is a ridge-like structure for photon-hadron pair correlations at RHIC and the LHC. We found that the hadronization of jet has non-trivial effects on the photon-jet correlations.

15 pages, 12 figures; v2: results unchanged, presentation improved, typos corrected. The version to appear in PRD. arXiv admin note: text overlap with arXiv:1209.0478

References in corpus (48)

• Parton distributions for the LHC
• The Color Glass Condensate
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• Universality of Unintegrated Gluon Distributions at small x
• Quark contribution to the small-$x$ evolution of color dipole
• Triumvirate of Running Couplings in Small-x Evolution
• The ridge in proton-proton collisions at the LHC
• Analysis of combined HERA data in the Impact-Parameter dependent Saturation model
• Novel Collective Phenomena in High-Energy Proton-Proton and Proton-Nucleus Collisions
• Gluon saturation and initial conditions for relativistic heavy ion collisions
• Forward inclusive dijet production and azimuthal correlations in pA collisions
• Update of Parton Distributions at NNLO
• Correlations from hydrodynamic flow in p-Pb collisions
• Solving The High Energy Evolution Equation Including Running Coupling Corrections
• Azimuthal correlations of forward di-hadrons in d+Au collisions at RHIC in the Color Glass Condensate
• kt-factorization for Hard Processes in Nuclei
• Measurement of long-range angular correlation and quadrupole anisotropy of pions and (anti)protons in central $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}$=200 GeV
• Measurements of elliptic and triangular flow in high-multiplicity ${}^3$He$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• 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
• Angular Correlations in Gluon Production at High Energy
• Exclusive vector meson production at high energies and gluon saturation
• Single-inclusive particle production in proton-nucleus collisions at next-to-leading order in the hybrid formalism
• Tomography of high-energy nuclear collisions with photon-hadron correlations
• Long-range pseudorapidity dihadron correlations in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• CGC predictions for p+A collisions at the LHC and signature of QCD saturation
• Gluon saturation and inclusive hadron production at LHC
• Prompt photon production and photon-hadron correlations at RHIC and the LHC from the Color Glass Condensate
• Azimuthal asymmetries and the emergence of "collectivity" from multi-particle correlations in high-energy pA collisions
• Elliptic flow in proton-proton collisions at 7 TeV
• Observation of a "Ridge" correlation structure in high multiplicity proton-proton collisions: A brief review
• Hadron multiplicity in pp and AA collisions at LHC from the Color Glass Condensate
• Gluon saturation and energy dependence of hadron multiplicity in pp and AA collisions at the LHC
• Two-particle correlations in high energy collisions and the gluon four-point function
• Azimuthal anisotropy of direct photons
• Azimuthal Asymmetry of pions in pp and pA collisions
• Two-Gluon Correlations in Heavy-Light Ion Collisions: Energy and Geometry Dependence, IR Divergences, and $k_T$-Factorization
• Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC
• Effect of event selection on jetlike correlation measurement in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV
• Drell-Yan Lepton-Pair-Jet Correlation in pA collisions
• Energy dependence of the ridge in high multiplicity proton-proton collisions
• Direct photons at forward rapidities in high-energy pp collisions
• Hadron production at the LHC: Any indication of new phenomena
• Initial and Final State Interaction Effects in Small-x Quark Distributions
• Di-photon "Ridge" in p+p and p+A collisions at RHIC and the LHC
• Diphoton production in high-energy p+A collisions
• Investigating the high energy QCD approaches for prompt photon production at the LHC
• Azimuthal quadrupole correlation from gluon interference in 200 GeV and 7 TeV p+p collisions

Cited by in corpus (12)

• Phenomenological Review on Quark-Gluon Plasma: Concepts vs. Observations
• Mining for Gluon Saturation at Colliders
• Elliptic flow from color-dipole orientation in pp and pA collisions
• Constraining unintegrated gluon distributions from inclusive photon production in proton-proton collisions at the LHC
• Isolated photon-hadron production in high energy $pp$ and $pA$ collisions at RHIC and LHC
• Prompt double $J/\psi$ production in proton-proton collisions at the LHC
• Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$
• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Directed flow from C-odd gluon correlations at small $x$
• The color dipole picture for prompt photon production in $pp$ and $pPb$ collisions at the CERN-LHC
• DPS in CGC: HBT correlations in double inclusive photon production
• Mapping the internal structure of hadrons through color and spin effects