Tensor-polarized gluon distribution \texorpdfstring{h1TTg}{h1TTg} in the deuteron: QCD evolution and Drell-Yan phenomenology
Abstract
We study the QCD evolution of the tensor-polarized double-helicity-flip gluon distribution h1TTg in the deuteron and its impact on proton-deuteron Drell-Yan production. The nonperturbative input is taken from the spin-1 spectator model and evolved at leading order with the autonomous gluon evolution equation. The uncertainty of the model fit is propagated to the tensor-polarized cross-section difference and the asymmetry AExy using an ensemble of 100 replicas. Compared with the earlier benchmark estimate based on a longitudinally polarized gluon distribution, the evolved spectator-model input gives smaller cross sections in most of the kinematic region and a much stronger decrease of |AExy| with Q2. At sufficiently large center-of-mass energy, the asymmetry varies only slowly with √s, whereas the low-√s and large-Q2 regions probe the poorly constrained large-x tail of the model. We also evolve the tensor-polarized gluon distribution f1LLg in the coupled singlet-gluon system and assess its contribution to the reference cross-section sum. Its effect remains moderate in the kinematic region where the spectator-model prediction is under reasonable control.
Related
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BibTeX
@misc{xie2026tensorpolarized,
title = {{Tensor-polarized gluon distribution \texorpdfstring$h_1TT^g$h1TTg in the deuteron: QCD evolution and Drell-Yan phenomenology}},
author = {Xiupeng Xie and Zhun Lu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.24552},
eprint = {2610.24552},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.24552},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Tensor-polarized gluon distribution \texorpdfstring{h_1TT^g}{h1TTg} in the deuteron: QCD evolution and Drell-Yan phenomenology
AU - Xiupeng Xie
AU - Zhun Lu
PY - 2026
DA - 2026/10/17
PB - arXiv
DO - 10.48550/arxiv.2610.24552
UR - https://arxiv.org/abs/2610.24552
AB - We study the QCD evolution of the tensor-polarized double-helicity-flip gluon distribution h_1TT^g in the deuteron and its impact on proton-deuteron Drell-Yan production. The nonperturbative input is taken from the spin-1 spectator model and evolved at leading order with the autonomous gluon evolution equation. The uncertainty of the model fit is propagated to the tensor-polarized cross-section difference and the asymmetry A_E_xy using an ensemble of 100 replicas. Compared with the earlier benchmark estimate based on a longitudinally polarized gluon distribution, the evolved spectator-model input gives smaller cross sections in most of the kinematic region and a much stronger decrease of |A_E_xy| with Q^2. At sufficiently large center-of-mass energy, the asymmetry varies only slowly with √s, whereas the low-√s and large-Q^2 regions probe the poorly constrained large-x tail of the model. We also evolve the tensor-polarized gluon distribution f_1LL^g in the coupled singlet-gluon system and assess its contribution to the reference cross-section sum. Its effect remains moderate in the kinematic region where the spectator-model prediction is under reasonable control.
ER -