One-point charge correlator as a probe for the odderon
Abstract
We propose the one-point charge correlator (OPCC) in transversely polarized deep inelastic scattering as a new probe of the spin-dependent odderon. The OPCC is an infrared and collinear safe observable constructed solely from the charge and angular information of final-state charged particles. Because the charge weight is odd under charge conjugation, the contribution of the C-even pomeron to the OPCC vanishes identically in the small-x eikonal limit, whereas the contribution of the C-odd spin-dependent odderon survives. We define a transverse single-spin asymmetry by normalizing the spin-dependent OPCC to the unpolarized charged-hadron one-point energy correlator. At small x, this asymmetry reduces to a ratio of spin-dependent odderon and pomeron contributions. We provide illustrative estimates of this asymmetry for Electron-Ion Collider kinematics within the small-x dipole framework with Balitsky--Kovchegov evolution to guide experimental studies. Dedicated measurements of the OPCC asymmetry with a transversely polarized proton beam would provide new quantitative constraints on the currently unconstrained spin-dependent odderon.
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BibTeX
@misc{cao2026onepoint,
title = {{One-point charge correlator as a probe for the odderon}},
author = {Haotian Cao and Zhong-Bo Kang and Diego Padilla and Jani Penttala},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12064},
eprint = {2609.12064},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759397v1},
}
RIS
TY - UNPB
TI - One-point charge correlator as a probe for the odderon
AU - Haotian Cao
AU - Zhong-Bo Kang
AU - Diego Padilla
AU - Jani Penttala
PY - 2026
DA - 2026/09/10
PB - HAL
DO - 10.48550/arxiv.2609.12064
UR - https://hal.science/hal-05759397v1
AB - We propose the one-point charge correlator (OPCC) in transversely polarized deep inelastic scattering as a new probe of the spin-dependent odderon. The OPCC is an infrared and collinear safe observable constructed solely from the charge and angular information of final-state charged particles. Because the charge weight is odd under charge conjugation, the contribution of the C-even pomeron to the OPCC vanishes identically in the small-x eikonal limit, whereas the contribution of the C-odd spin-dependent odderon survives. We define a transverse single-spin asymmetry by normalizing the spin-dependent OPCC to the unpolarized charged-hadron one-point energy correlator. At small x, this asymmetry reduces to a ratio of spin-dependent odderon and pomeron contributions. We provide illustrative estimates of this asymmetry for Electron-Ion Collider kinematics within the small-x dipole framework with Balitsky--Kovchegov evolution to guide experimental studies. Dedicated measurements of the OPCC asymmetry with a transversely polarized proton beam would provide new quantitative constraints on the currently unconstrained spin-dependent odderon.
ER -