$J/\psi$ polarization in the CGC+NRQCD approach

Abstract

We compute the $J/\psi$ polarization observables ${\lambda }_{\theta }$, ${\lambda }_{\varphi }$, ${\lambda }_{\theta \varphi }$ in a Color Glass Condensate (CGC) + nonrelativistic QCQ (NRQCD) formalism that includes contributions from both color singlet and color octet intermediate states. Our results are compared to low $p_T$ data on $J/\psi$ polarization from the LHCb and ALICE experiments on proton-proton collisions at center-of-mass energies of $\sqrt{s}=7$ TeV and 8 TeV. Our CGC+NRQCD computation provides a better description of data for $p_T\le 15$ GeV relative to extant next-to-leading (NLO) calculations within the collinear factorization framework. These results suggest that higher order computations in the CGC+NRQCD framework have the potential to greatly improve the accuracy of extracted values of the NRQCD universal long distance matrix elements.

arXiv comment26 pages, 8 figures, accepted for publication in JHEP

References in corpus (78)

• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Computing Quark and Gluon Distribution Functions for Very Large Nuclei
• Heavy quarkonium: progress, puzzles, and opportunities
• Operator expansion for high-energy scattering
• Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum
• Small-x F_2 Structure Function of a Nucleus Including Multiple Pomeron Exchanges
• Nonlinear Gluon Evolution in the Color Glass Condensate: I
• The Color Glass Condensate
• The Wilson renormalization group for low x physics: towards the high density regime
• Nonlinear Gluon Evolution in the Color Glass Condensate: II
• The Wilson renormalization group for low x physics: Gluon evolution at finite parton density
• Color-octet quarkonia production
• Quarkonium Wave Functions at the Origin
• Color-octet quarkonia production II
• NLO evolution of color dipoles
• Evolution at small x_bj: The Color Glass Condensate
• Measurement of J/psi production in pp collisions at sqrt(s)=7 TeV
• Triumvirate of Running Couplings in Small-x Evolution
• J/psi polarization at hadron colliders in nonrelativistic QCD
• High energy pA collisions in the color glass condensate approach II. Quark production
• J/psi (psi') production at the Tevatron and LHC at O(α_s^4v^4) in nonrelativistic QCD
• Reconciling J/psi production at HERA, RHIC, Tevatron, and LHC with NRQCD factorization at next-to-leading order
• J/psi polarization at Tevatron and LHC: Nonrelativistic-QCD factorization at the crossroads
• World data of J/psi production consolidate NRQCD factorization at NLO
• Polarization for Prompt J/psi, psi(2s) production at the Tevatron and LHC
• Measurement of J/Psi and Psi(2S) Polarization in ppbar Collisions at sqrt(s) = 1.8 TeV
• Polarizations of J/psi and psi(2S) Mesons Produced in ppbar Collisions at 1.96 TeV
• Polarization of Prompt J/psi at the Tevatron
• Solving The High Energy Evolution Equation Including Running Coupling Corrections
• CGC predictions for p+Pb collisions at the LHC
• Towards the experimental clarification of quarkonium polarization
• The Color Glass Condensate and High Energy Scattering in QCD
• Predictions for $p+$Pb Collisions at sqrt s_NN = 5 TeV
• Comprehensive description of $J/\psi$ production in proton-proton collisions at collider energies
• Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at sqrt(s) = 7 TeV
• Measurement of $J/\psi$ polarization in $pp$ collisions at $\sqrt{s}=7$ TeV
• J/$\psi$ polarization in pp collisions at $\sqrt{s}=7$ TeV
• Cold Nuclear Matter Effects on J/psi and Upsilon Production at the LHC
• Heavy quark pair production in high energy pA collisions: Quarkonium
• QCD radiative corrections to ${\chi }_{cJ}$ production at hadron colliders
• Heavy quark pair production in high energy pA collisions: Open heavy flavors
• Next-to-eikonal corrections in the CGC: gluon production and spin asymmetries in pA collisions
• Quark pair production in high energy pA collisions: General features
• QCD corrections to J/psi production via color octet states at Tevatron and LHC
• Quarkonium Production in an Improved Color Evaporation Model
• Forward $J/\psi$ production in proton-nucleus collisions at high energy
• Inelastic photoproduction of polarised $J/\psi$
• A complete NLO calculation of the $J/\psi$ and ${\psi }^{\prime }$ production at hadron colliders
• Large mass Q-Qbar production from the Color Glass Condensate
• $J/\psi$ production and suppression in high energy proton-nucleus collisions
• Fragmentation contributions to hadroproduction of prompt $J/\psi$, ${\chi }_{cJ}$, and $\psi (2S)$ states
• High Gluon Densities in Heavy Ions Collisions
• Centrality and pT dependence of J/psi suppression in proton-nucleus collisions from parton energy loss
• Measurement of the ratio of prompt ${\chi }_c$ to $J/\psi$ production in $pp$ collisions at $\sqrt{s}=7$ TeV
• Quarkonium production in high energy proton-nucleus collisions: CGC meets NRQCD
• Next-to-next-to-eikonal corrections in the CGC
• Rotation-invariant relations in vector meson decays into fermion pairs
• Heavy Quarkonium Production at Low Pt in NRQCD with Soft Gluon Resummation
• Probing gluon saturation with next-to-leading order photon production at central rapidities in proton-nucleus collisions
• A new approach to quarkonium polarization studies
• Probing nonrelativistic QCD factorization in polarized J/psi photoproduction at next-to-leading order
• Impact parameter dependence of the nuclear modification of J/psi production in d+Au collisions at sqrt(S_NN) = 200 GeV
• Measurement of the relative rate of prompt ${\chi }_{c0}$, ${\chi }_{c1}$ and ${\chi }_{c2}$ production at $\sqrt{s}=7$TeV
• Event engineering studies for heavy flavor production and hadronization in high multiplicity hadron-hadron and hadron-nucleus collisions
• Transverse momentum distribution of Upsilon production in hadronic collisions
• $\psi (2S)$ versus $J/\psi$ suppression in proton-nucleus collisions from factorization violating soft color exchanges
• Constraining unintegrated gluon distributions from inclusive photon production in proton-proton collisions at the LHC
• Spin correlations in polarizations of P-wave charmonia ${\chi }_{cJ}$ and impact on $J/\psi$ polarization
• Particle production in high-energy collisions beyond the shockwave limit
• Inclusive prompt photon production in electron-nucleus scattering at small x
• High energy pA collisions in the Color Glass Condensate approach
• Color-Octet ${\psi }^{\prime }$ Production at Low $p_{\perp }$
• Measurement of the inclusive J/$\psi$ polarization at forward rapidity in pp collisions at $\sqrt{s}=8$ TeV
• Universal Suppression of Heavy Quarkonium Production in pA Collisions at Low Transverse Momentum
• Fragmentation functions of polarized heavy quarkonium
• Forward Heavy Quarkonium Productions at the LHC
• Angular distribution and rotations of frame in vector meson decays into lepton pairs
• Rotation-invariant observables in polarization measurements

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• Measurement of inclusive J/$\psi$ polarization in p+p collisions at $\sqrt{s}$ = 200 GeV by the STAR experiment
• Exotic tetraquarks at the HL-LHC with JETHAD: A high-energy viewpoint
• The complete study on polarization of ${\rm Y}(nS)$ hadroproduction at QCD next-to-leading order
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• Direct quarkonium-plus-gluon production in DIS in the Color Glass Condensate
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• Quarkonium Polarization in Medium from Open Quantum Systems and Chromomagnetic Correlators
• Triply Heavy $\Omega$ Baryons with JETHAD: A High-Energy Viewpoint
• $J/\psi$ and $\psi$(2S) polarization in proton-proton collisions at energies available at the CERN Large Hadron Collider using PYTHIA8
• BFKL Pomeron loop contribution in diffractive photoproduction and inclusive hadroproduction of $J/\psi$ and ${\rm Y}$
• Tetraquark-Jet Systems at the High-Luminosity LHC
• $J/\psi$ polarization in large-$P_T$ semi-inclusive deep-inelastic scattering at the EIC