The energy spectrum of forward photons measured by the RHICf experiment in s = 510 GeV proton-proton collisions

K. Sato, Y. Itow, H. Menjo, M. Ueno, K. Ohashi, T. Sako, Y. Goto, I. Nakagawa, R. Saidl, J. S. Park, M. H. Kim, B. Hong, K. Tanida, S. Torii, K. Kasahara, N. Sakurai, O. Adriani, R. D'Alessandro, L. Bonechi, E. BertiA. Tricomi

Research output: Contribution to journalConference articlepeer-review


The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at √s = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100% for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90% for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small.

Original languageEnglish
Article number413
JournalProceedings of Science
Publication statusPublished - 2021 Jul 2
Event36th International Cosmic Ray Conference, ICRC 2019 - Madison, United States
Duration: 2019 Jul 242019 Aug 1

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ASJC Scopus subject areas

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