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Quarkonium production serves as a vital testing ground for quantum chromodynamics (QCD), offering critical insights into both perturbative and nonperturbative dynamics. In the nonrelativistic QCD (NRQCD) factorization framework, inclusive production cross sections of quarkonia are expressed as products of perturbatively calculable short-distance coefficients (SDCs) and nonperturbative long-distance matrix elements (LDMEs), which are hypothesized to be universal across production processes. For three decades, the validation of LDME universality has been central to understanding quarkonium production mechanisms. However, different groups extracted dramatically different sets of the three color-octet LDMEs of J/psi, and none of them can describe all the data at LHC, HERA, LEP and Belle, challenging the universality of LDMEs. In this talk, we will report our recent progress on factorizing the LDMEs into products of wave functions and gluonic correlators based on the potential NRQCD (pNRQCD) effective theory and comprehensive phenomenogical study on inclusive quarkonium prductions. We show that most of the data can be well described in the framwork of NRQCD factorization and those still evade a consistent discription coincide with “extenstions” of endpoint regions.
About the speaker:
Xiang-Peng Wang got his PhD from Hamburg University in 2018. He conducted his first postdoc research in Argonne National Lab in collaboration with Geoffrey Bodwin working on next-to-leading power factorization related to quarkonium exclusive production. He went back to Germany in September 2021 and started his second postdoc position in collaboration with Nora Brambilla working on quarkonium production mechnism using pNRQCD effective theory and pertrubative gradient flow to provide input for precise lattice computations. He joined the institute of Particle Physics of Central China Normal University in March 2025.
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Prof. Jian Wang