Resolving the universality and polarization puzzles in J/ψ hadroproduction
Abstract
Prompt J/ψ hadroproduction poses two related puzzles: fixed-order hadronic and e+e- analyses give incompatible constraints on the same color-octet (CO) long-distance matrix element (LDME) combination, and the weak observed polarization is difficult to reproduce together with the yield. We analyze high-pT production in the fragmentation-function formalism with leading-logarithmic threshold resummation in both nonrelativistic QCD (NRQCD) and soft-gluon factorization (SGF). Combining the resummed hadroproduction fit with bounds from resummed e+e- production, we find in both frameworks a common LDME region satisfying the two constraints simultaneously: threshold resummation resolves the universality tension present at fixed order. There, the 1S0[8] contribution is small and the yield is governed by the 3S1[8] and 3PJ[8] channels, whose leading transverse contributions largely cancel. The cancellation amplifies spin-symmetry-breaking transitions in the 3S1[8] channel, so that within a one-parameter spin-flip ansatz a contribution of natural order v4 accommodates both the measured yields and the weak polarization. A similar sensitivity holds for ψ(2S) production.
Related
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- Resolving magnetic order and dynamics with polarized neutron scattering: a practical guide to longitudinal polarization analysis
- Toponium hadroproduction at next-to-next-to-leading order in NRQCD
- Prompt charmonia hadroproduction in High Energy Factorization with tree-level NLO corrections
- Probing Lorentz Symmetry Violation via Hadroproduction in Electroweak Pair Annihilation
BibTeX
@misc{chen2026resolving,
title = {{Resolving the universality and polarization puzzles in $J/ψ$ hadroproduction}},
author = {An-Ping Chen and Jun Guo and Yan-Qing Ma},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.24674},
eprint = {2609.24674},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.24674},
}
RIS
TY - UNPB
TI - Resolving the universality and polarization puzzles in J/ψ hadroproduction
AU - An-Ping Chen
AU - Jun Guo
AU - Yan-Qing Ma
PY - 2026
DA - 2026/09/21
PB - arXiv
DO - 10.48550/arxiv.2609.24674
UR - https://arxiv.org/abs/2609.24674
AB - Prompt J/ψ hadroproduction poses two related puzzles: fixed-order hadronic and e^+e^- analyses give incompatible constraints on the same color-octet (CO) long-distance matrix element (LDME) combination, and the weak observed polarization is difficult to reproduce together with the yield. We analyze high-p_T production in the fragmentation-function formalism with leading-logarithmic threshold resummation in both nonrelativistic QCD (NRQCD) and soft-gluon factorization (SGF). Combining the resummed hadroproduction fit with bounds from resummed e^+e^- production, we find in both frameworks a common LDME region satisfying the two constraints simultaneously: threshold resummation resolves the universality tension present at fixed order. There, the ^1S_0^[8] contribution is small and the yield is governed by the ^3S_1^[8] and ^3P_J^[8] channels, whose leading transverse contributions largely cancel. The cancellation amplifies spin-symmetry-breaking transitions in the ^3S_1^[8] channel, so that within a one-parameter spin-flip ansatz a contribution of natural order v^4 accommodates both the measured yields and the weak polarization. A similar sensitivity holds for ψ(2S) production.
ER -