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Heavy Quarkonium Physics
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Heavy Quarkonium Physics
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This report is the result of the collaboration and research effort of the Quarkonium Working Group over the last three years. It provides a comprehensive overview of the state of the art in heavy-quarkonium theory and experiment, covering quarkonium spectroscopy, decay, and production, the determination of QCD parameters from quarkonium observables, quarkonia in media, and the effects on quarkonia of physics beyond the Standard Model. An introduction to common theoretical and experimental tools is included. Future opportunities for research in quarkonium physics are also discussed.
Forward citations
Cited by 13 Pith papers
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Next-to-next-to-leading-order QCD corrections to ${}^3S_1^{(8)}$ gluon fragmentation function for quarkonium
First NNLO QCD calculation of the ³S₁⁽⁸⁾ gluon fragmentation function in NRQCD, yielding positive substantial corrections and endpoint logarithms for threshold resummation.
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Observation of a $B_c^{*+}$ meson with the ATLAS detector
First observation of the B_c^{*+} meson with mass difference 64.5 MeV from the ground-state B_c^+ at >8 sigma significance using ATLAS data.
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Next-to-next-to-leading-order QCD corrections to ${}^3S_1^{(8)}$ gluon fragmentation function for quarkonium
First NNLO QCD short-distance coefficients for the ³S₁⁽⁸⁾ gluon fragmentation function are obtained numerically to high precision, with analytic endpoint logarithms reconstructed for threshold resummation.
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First measurement of the masses of the $\Upsilon_1(1D)$ and $\Upsilon_3(1D)$ states and the energy dependence of the cross sections for $e^+e^-\to\Upsilon_J(1D)\eta$ and $e^+e^-\to\Upsilon_J(1D)\pi^+\pi^-$
First evidence for Υ1(1D) (4.8σ) and Υ3(1D) (3.0σ), Υ2(1D) mass 10167.0±1.0±0.2 MeV/c², mass splittings Δm12=11.8±1.5±0.4 and Δm23=7.6±2.4±0.6 MeV/c², plus energy-dependent Born cross sections.
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Revisiting relativistic corrections to inclusive $J/\psi$ production at B factories: Complete expansion for three-body quarkonium production
Full final-state kinematic expansion yields scheme-independent O(v²) corrections of about −14.6% (cc̄) and +12% (non-cc̄) for inclusive J/ψ at B factories, yet tension with Belle data remains.
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Radiative decays $J/\psi,\,\psi(2S)\rightarrow\gamma\eta^{(\prime)}$ in perturbative QCD with relativistic corrections
Order-q² relativistic corrections in pQCD roughly double J/ψ→γη(') rates and favor a smaller mixing angle, while ψ(2S) rates overshoot data and may require coherent ηc mixing.
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Precision Study of Semileptonic and Non-Leptonic $B_c$ Decays to $\eta_c$ and P Wave Charmonia
Data-constrained NRQCD form factors yield R(χ_c0)=0.185(3), R(χ_c1)=0.147(26), R(h_c)=0.068(2) and related B_c branching fractions for P-wave charmonia.
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Toward Precision Fragmentation of $\Omega_{3Q}$ Baryons: The OMG3Q1.1 Framework
The OMG3Q1.1 framework delivers the first uncertainty-quantified set of fragmentation functions for all-heavy Ω_{3Q} baryons via diquark-inspired inputs, HF-NRevo evolution, and replica-based error estimation.
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Extraction of charmonium branching fractions from $J/\psi\to\gamma\eta_c$ radiative decays
Proposes new photon line shape and branching fraction extraction method for J/psi to gamma eta_c, claiming compatibility between PDG data correlations and lattice QCD widths via profile scan.
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Prospects for observing the ${\eta}_{t}$ ${\to}$ $W^{+}W^{-}$ decay at the HL-LHC
With two scenarios for f_ηt, tens of ηt→W+W-→ℓℓ'νν̄ dilepton events may be observable at HL-LHC given >3×10^7 ηt, offering a clean complementary search channel.
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Measurement of the $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) differential cross sections in pp collisions at $\sqrt{s}$ = 13.6 TeV
First CMS measurement of Υ(1S), Υ(2S), and Υ(3S) differential cross sections at √s=13.6 TeV, extending the pT reach from 100 to 200 GeV.
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Inclusive diffractive heavy quarkonium photoproduction in pp, pA and AA collisions
NRQCD-based calculation extended via resolved pomeron model yields predictions for inclusive diffractive heavy quarkonium photoproduction at LHC, with resolved processes contributing up to 44% in pp collisions for Υ r...
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Absorption of 1$P$-wave heavy charmonium $\chi_{c1}(1P)$ in nuclei
Calculations of excitation functions, momentum spectra, and transparency ratios for χ_c1(1P) on 12C and 184W nuclei demonstrate sensitivity to different absorption cross-section scenarios, proposed for extraction via ...
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