Speaker
Description
We explore the fundamental mechanisms governing exotic-matter formation through the TQ4Q2.0 collinear, variable-flavor-number-scheme fragmentation functions for fully heavy tetraquarks in three quantum configurations: scalar ($0^{++}$), axial vector ($1^{+-}$), and tensor ($2^{++}$). Short-distance inputs at the initial scale are constructed within nonrelativistic QCD factorization and include all parton-initiated channels. Scale evolution is performed via the threshold-aware HF-NRevo framework. A comprehensive uncertainty analysis is carried out by consistently combining nonperturbative contributions from color-composite long-distance matrix elements (LDMEs) with perturbative heavy-flavor-fragmentation missing higher-order uncertainties (F-MHOUs). Among the accessible configurations, the axial-vector channel stands out as a particularly sensitive probe of the proton's intrinsic charm component, especially in proton-proton collisions at LHC and FCC energies. The release of the next-generation TQ4Q2.0 fragmentation set provides a robust quantitative baseline for experimental searches of fully heavy tetraquarks across an extended kinematic domain. Overall, our study advances the interplay between hadronic structure, precision QCD, and exotic spectroscopy, offering new avenues to investigate unexplored facets of QCD and potential windows onto physics beyond the Standard Model.
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