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$\eta_c$ production at the LHC challenges nonrelativistic-QCD factorization
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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.
Forward citations
Cited by 4 Pith papers
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Probing Heavy-Quark Spin Symmetry in Double $J/\psi$ Hadroproduction
A complete O(alpha_s^5) NRQCD calculation for prompt J/psi pair hadroproduction finds LHC data fix one combination of color-octet LDMEs, yielding a set that tests heavy-quark spin symmetry via eta_c 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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How well does nonrelativistic QCD factorization work at next-to-leading order?
A single set of NRQCD color-octet matrix elements fitted to LHC J/psi and eta_c data predicts a wide range of quarkonium observables, including Upsilon(3S) production and low-momentum photoproduction, with residual fa...
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Double heavy quarkonia production with color-octet channels at Z factory and at the CEPC/FCC-ee
Color-octet channels are predicted to dominate many double heavy quarkonium production processes at future Z factories, with relativistic corrections suppressing charmonium rates by roughly a factor of two.
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