Suppression of diffraction in DIS on nuclei and dynamical mechanism of leading twist nuclear shadowing

2024/11/15 by Guzey, V.
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2411.10103

Abstract

Using the leading twist approach (LTA) to nuclear shadowing (NS), we calculate the ratio of the diffractive-to-total DIS cross sections R_{\rm diff/tot} for a heavy nucleus and proton and confirm that R_{\rm diff/tot} ≈ 0.5-1 in contrast with R_{\rm diff/tot} ≈ 1.5-2 in the dipole model. We show that the magnitude of R_{\rm diff/tot} is controlled by an effective dipole cross section so that R_{\rm diff/tot} → 1 in the black disk limit. We also argue that strong leading twist NS as well as the dilute nuclear density deplete nuclear enhancement of the saturation scale leading to Q_sA²(b=0)/Q_sp²(b=0) ∼ 1.

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