Measurement of forward photon production cross-section in pp collisions at $\sqrt{s}$ = 510 GeV with RHICf detector

TL;DR

This paper reports measurements of inclusive photon production cross-sections in proton-proton collisions at 510 GeV across various pseudorapidity regions, comparing results with theoretical models and higher energy data.

Contribution

First measurement of photon production cross-sections in pp collisions at 510 GeV across multiple pseudorapidity regions, extending previous high-energy results.

Findings

Results are consistent with Feynman scaling law.

Model predictions generally agree within uncertainties.

Some models show weak energy dependence.

Abstract

This study reported the inclusive differential production cross-section of photons in six pseudorapidity regions: 6.1 < $\eta$ < 6.5, 6.5 < $\eta$ < 7.0, 7.0 < $\eta$ <7.5, 7.5 < $\eta$ <8.0, 8.0 < $\eta$ < 8.5, and $\eta$ > 8.5, measured through the RHICf experiment with pp collisions at $\sqrt{s}$ = 510 GeV conducted in June 2017. In addition, the cross-sections in the three regions of the $x_F$-$p_T$ phase space coverage that are same as those of the LHCf results at $\sqrt{s}$ = 7 and 13 TeV were obtained and compared. Considering the uncertainties, the results were observed to be consistent with both the Feynman scaling law and the model predictions of EPOS-LHC, QGSJET-II-04, Sibyll 2.3d, and DPMjet-III 2019.1, although certain models exhibited weak collision energy dependencies.