Novel cross section ratios as possible signals of saturation in ultraperipheral collisions

Kovchegov, Yuri V.; Sun, Huachen; Tu, Zhoudunming

doi:10.1103/PhysRevD.109.094028

Title: Novel cross section ratios as possible signals of saturation in ultraperipheral collisions

Journal Article · 17 May 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.094028 · OSTI ID:2474665

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We propose new cross section ratios in ultraperipheral $A + A$ and $p + A$ collisions (UPCs) as a potential experimental signal of saturation physics. We consider the ratio $R_{1}$ of elastic vector meson photoproduction cross section to the inclusive hadron or jet photoproduction cross section. The ratio can be measured in the $γ + A$ and $γ + p$ collisions taking place in the UPCs. We label the ratios $R_{1} (A)$ and $R_{1} (p)$ , respectively. Constructing the double ratio $R_{UPC} (A) = R_{1} (A) / R_{1} (p)$ , and performing a small- $x$ calculation both in the quasiclassical approximation and by including small- $x$ evolution, we observe that $R_{UPC} (A)$ exhibits a markedly different dependence on the nuclear atomic number inside and outside the saturation region. This result indicates that $R_{UPC} (A)$ and $R_{1} (A)$ measurements in UPCs may help in the experimental searches for the evidence of saturation physics. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0012704; SC0004286

OSTI ID:: 2474665

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 9 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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