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T: Fachverband Teilchenphysik
T 62: Cosmic Rays III
T 62.8: Vortrag
Mittwoch, 18. März 2026, 18:00–18:15, KS 00.006
Forward Photon Measurement in Proton-Oxygen Run at the LHC with the LHCf Experiment — •Vlera Hajdini, Prof. Dr. Cigdem Issever, and Dr. Clara Leitgeb — Physics Insitute, Humboldt University of Berlin
The Large Hadron Collider forward (LHCf) experiment plays a fundamental role in Ultra High Energetic Cosmic Ray (UHECR) physics by providing tuning data for the hadronic interaction models used for Extensive Air Shower (EAS) simulations. LHCf measures neutral particles (γ, π0, n) in the very forward region (η>8.4) produced at the ATLAS interaction point (IP1), using two sampling calorimeters, Arm1 and Arm2, installed 140 m on both sides of the IP1.
In July 2025, LHCf participated in the first proton-Oxygen (p-O) collision run at the LHC, collecting data at √sNN=9.6 TeV. Forward particle production in p-O collisions is particularly relevant for UHECR studies, as it reproduces one of the projectile-target combinations characteristic of atmospheric interactions initiated by primary cosmic rays.
With a photon energy resolution of about 2% and a position resolution better than 40 µm, LHCf is well suited to investigate forward photon production with high precision. This contribution presents the current status of the photon analysis in p-O collisions.