Single spin asymmetry in forward p A collisions from the Pomeron-odderon interference

Benić, Sanjin; Vivoda, Eric Andreas

doi:10.1103/PhysRevD.111.094027

Title: Single spin asymmetry in forward $p A$ collisions from the Pomeron-odderon interference

Journal Article · 15 May 2025 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.111.094027 · OSTI ID:2566893

Benić, Sanjin;

Working in the hybrid framework of the high energy $p A$ collisions we identify a new contribution to transverse single spin asymmetry (SSA). The phase necessary for the SSA is provided by the Pomeron-odderon interference in the dense nuclear target. The complete formula for the $p A \to h X$ polarized cross section also contains the transversity distribution for the polarized projectile as well as the real part of the twist-three fragmentation function. We numerically estimate the asymmetry $A_{N}$ and its nuclear dependence. Based on a model computation we find that $A_{N}$ can be a percent level in the forward and low- $P_{h ⊥}$ region. For large nuclei we find significant suppression, with $A_{N} \propto A^{- 7 / 6}$ parametrically. As a notable feature we find a node of $A_{N}$ as a function of the $P_{h ⊥}$ around the values of the initial saturation scale that could be used to test this mechanism experimentally. Published by the American Physical Society 2025

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Sponsoring Organization:: USDOE

OSTI ID:: 2566893

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 111; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Unified Picture for Single Transverse-Spin Asymmetries in Hard-Scattering Processes Ji, Xiangdong; Qiu, Jian-Wei; Vogelsang, Werner Physical Review Letters, Vol. 97, Issue 8 https://doi.org/10.1103/PhysRevLett.97.082002	journal	August 2006
Electron-Ion Collider: The next QCD frontier: Understanding the glue that binds us all Accardi, A.; Albacete, J. L.; Anselmino, M. The European Physical Journal A, Vol. 52, Issue 9 https://doi.org/10.1140/epja/i2016-16268-9	journal	September 2016
Elastic differential cross-section $${\mathrm{d}}\sigma /{\mathrm{d}}t$$ at $$\sqrt{s}=2.76\hbox { TeV}$$ and implications on the existence of a colourless C-odd three-gluon compound state Antchev, G.; Aspell, P.; Atanassov, I. The European Physical Journal C, Vol. 80, Issue 2 https://doi.org/10.1140/epjc/s10052-020-7654-y	journal	February 2020
Transverse spin observables in hard-scattering hadronic processes within collinear factorization Pitonyak, Daniel International Journal of Modern Physics A, Vol. 31, Issue 32 https://doi.org/10.1142/S0217751X16300490	journal	November 2016
The Color Glass Condensate Gelis, Francois; Iancu, Edmond; Jalilian-Marian, Jamal Annual Review of Nuclear and Particle Science, Vol. 60, Issue 1 https://doi.org/10.1146/annurev.nucl.010909.083629	journal	November 2010