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Production and polarization of $S$-wave quarkonia in potential nonrelativistic QCD
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abstract
Based on the potential nonrelativistic QCD formalism, we compute the nonrelativistic QCD long-distance matrix elements (LDMEs) for inclusive production of $S$-wave heavy quarkonia. This greatly reduces the number of nonperturbative unknowns and brings in a substantial enhancement in the predictive power of the nonrelativistic QCD factorization formalism. We obtain improved determinations of the LDMEs and find cross sections and polarizations of $J/\psi$, $\psi(2S)$, and excited $\Upsilon$ states that agree well with LHC data. Our results may have important implications in pinning down the heavy quarkonium production mechanism.
Forward citations
Cited by 4 Pith papers
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$\psi(2S)$ production in jets using NRQCD
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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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