Joint Bayesian Inference for Extraction of Charmonium Long Distance Matrix Elements Using PYTHIA
Abstract
We present a joint Bayesian extraction of the nonrelativistic QCD long-distance matrix elements (LDMEs) for J/ψ, ψ(2S), and χc production, using short-distance coefficients and feed-down structure implemented in PYTHIA 8.317. Rather than fitting each charmonium state separately, we construct channel-resolved responses that link parent production to daughter feed-down and infer all LDMEs simultaneously from 286 prompt charmonium measurements in pp collisions at √s=5.02-13 TeV at the LHC. The extracted LDMEs provide a good description of the data, with an overall χ2/ndf=1.18. We also provide a positivity-constrained set that can be used directly as PYTHIA input. Using the extracted LDMEs, we predict prompt J/ψ and ψ(2S) cross sections at high transverse momentum in pp collisions at √s=200 GeV, which can be tested with RHIC data.
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BibTeX
@misc{liu2026joint,
title = {{Joint Bayesian Inference for Extraction of Charmonium Long Distance Matrix Elements Using PYTHIA}},
author = {Yubo Liu and Rongrong Ma},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.08463},
eprint = {2611.08463},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.08463},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Joint Bayesian Inference for Extraction of Charmonium Long Distance Matrix Elements Using PYTHIA
AU - Yubo Liu
AU - Rongrong Ma
PY - 2026
DA - 2026/11/05
PB - arXiv
DO - 10.48550/arxiv.2611.08463
UR - https://arxiv.org/abs/2611.08463
AB - We present a joint Bayesian extraction of the nonrelativistic QCD long-distance matrix elements (LDMEs) for J/ψ, ψ(2S), and χ_c production, using short-distance coefficients and feed-down structure implemented in PYTHIA 8.317. Rather than fitting each charmonium state separately, we construct channel-resolved responses that link parent production to daughter feed-down and infer all LDMEs simultaneously from 286 prompt charmonium measurements in pp collisions at √s=5.02-13 TeV at the LHC. The extracted LDMEs provide a good description of the data, with an overall χ^2/ndf=1.18. We also provide a positivity-constrained set that can be used directly as PYTHIA input. Using the extracted LDMEs, we predict prompt J/ψ and ψ(2S) cross sections at high transverse momentum in pp collisions at √s=200 GeV, which can be tested with RHIC data.
ER -