${\eta }_c$ production at the LHC challenges nonrelativistic-QCD factorization

Abstract

We analyze the first measurement of ${\eta }_c$ production, performed by the LHCb Collaboration, in the nonrelativistic-QCD (NRQCD) factorization framework at next-to-leading order (NLO) in the strong-coupling constant ${\alpha }_s$ and the relative velocity $v$ of the bound quarks including the feeddown from $h_c$ mesons. Converting the long-distance matrix elements (LDMEs) extracted by various groups from $J/\psi$ yield and polarization data to the ${\eta }_c$ case using heavy-quark spin symmetry, we find that the resulting NLO NRQCD predictions greatly overshoot the LHCb data, while the color-singlet model provides an excellent description.

5 pages, 2 figures, minor changes, note regarding arXiv:1411.7350 [hep-ph] added, accepted for publication in Physical Review Letters

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Cited by in corpus (18)

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• Associated production of a quarkonium and a Z boson at one loop in a quark-hadron-duality approach
• Measurement of the ${\eta }_c(1S)$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV
• Polarization of prompt $J/\psi$ and ${\rm Y}$(1S) production in the color evaporation model
• Phenomenological NLO analysis of eta(c) production at the LHC in the collider and fixed-target modes
• Fully-heavy structures in the invariant mass spectrum of $J/\psi \psi (3686)$, $J/\psi \psi (3770)$, $\psi (3686)\psi (3686)$, and $J/\psi {\rm Y}(1S)$ at hadron colliders
• Energy Dependence of Direct-Quarkonium Production in pp Collisions from Fixed-Target to LHC Energies: Complete One-Loop Analysis
• Relativistic corrections to $J/\psi$ polarization in photo- and hadroproduction
• HELAC-Onia 2.0: an upgraded matrix-element and event generator for heavy quarkonium physics
• Inclusive diffractive ${\eta }_{\mathrm{c}}$ production in pp, pA and AA modes at the LHC
• Kinematic distributions of the ${\eta }_c$ photoproduction in $ep$ collisions within the nonrelativistic QCD framework
• ${\eta }_c$ production associated with light hadrons at the B-factories and the future super B-factories
• Study of charmonium production using decays to hadronic final states with the LHCb experiment
• NLO QCD Corrections to Inclusive Charmonium and $B_c$ Meson Production in $W^{+}$ Decays
• ${\eta }_Q$ meson photoproduction in ultrarelativistic heavy ion collisions
• Bottomonia production in p+p collisions under NRQCD formalism