The polarized photon distribution function

Daniel de Florian; Lucas Palma Conte; Gabriel Fernando Volonnino

doi:10.1140/epjc/s10052-024-13294-4

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2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2024) 84: 905
https://doi.org/10.1140/epjc/s10052-024-13294-4

Regular Article - Theoretical Physics

The polarized photon distribution function

Daniel de Florian, Lucas Palma Conte^b and Gabriel Fernando Volonnino

International Center for Advanced Studies (ICAS), ICIFI and ECyT-UNSAM, 25 de Mayo y Francia, (1650) San Martín, Pcia, Buenos Aires, Argentina

^b lpalmaconte@unsam.edu.ar

Received: 18 June 2024
Accepted: 23 August 2024
Published online: 6 September 2024

Abstract

We employ the LuxQED approach to compute the polarized photon PDF (photon pPDF). This approach expresses the pPDF in terms of the structure functions $g_{1}$ $$g_1$$ and $g_{2}$ $$g_2$$ . Different models for the structure functions are employed according to the parameter space region. The resulting pPDF is approximately of the order of x times the unpolarized PDF. The relative uncertainty in the photon pPDF reaches up to 50% for $x \sim 10^{- 3}$ $x \sim 10^{-3}$ , decreasing to approximately 10% for higher values of x. The computation of the photon pPDF will be essential for improving the precision of polarized calculations and will have fundamental implications for studies at the future Electron-Ion Collider (EIC).

© The Author(s) 2024

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