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arXiv · 2203.07778

Production and polarization of $S$-wave quarkonia in potential nonrelativistic QCD

Nora Brambilla·Hee Sok Chung·Antonio Vairo·Xiang-Peng Wang
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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.

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Nora Brambilla, Hee Sok Chung, Antonio Vairo, Xiang-Peng Wang. 2022-03-15. Production and polarization of $S$-wave quarkonia in potential nonrelativistic QCD. https://doi.org/10.1103/physrevd.105.l111503

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