Abstract
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 R1 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 R1(A) and R1(p), respectively. Constructing the double ratio RUPC(A)=R1(A)/R1(p), and performing a small-x calculation both in the quasiclassical approximation and by including small-x evolution, we observe that RUPC(A) exhibits a markedly different dependence on the nuclear atomic number inside and outside the saturation region. This result indicates that RUPC(A) and R1(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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