https://doi.org/10.1051/epjconf/202532000043
Performance of hadronic shower measurement with LHCf and ATLAS ZDC detectors
Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
* e-mail: kobayashi.haruka.m7@s.mail.nagoya-u.ac.jp
Published online: 7 March 2025
Ultrahigh-energy cosmic rays are measured by using air showers that generate many particles through hadronic interactions. Therefore understanding hadronic interactions is essential, especially for particle production in the very forward region, which contribute to the shower development. The collaboration of LHCf and ATLAS ZDC located behind the LHCf detector realize the precise measurement of neutrons in the very forward region of ATLAS collision point for studies of one pion exchange and diffractive events with pp collision at √s = 13.6 TeV. Herein, we present the performance of the LHCf + ATLAS ZDC joint operation studied using a beam test with 350 GeV proton beams at the SPS in 2021. We confirmed the good energy resolution of 22% compared to the LHCf stand alone measurement of 46%. In addition, we measured the uniformty of the reconstructed energy and the energy resolution. We confirmed that the uniformty of the reconstructed energy was less than 4%, and the energy resolution was uniform except for the edge region.
© The Authors, published by EDP Sciences, 2025
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