Speaker
Description
Large Hadron Collider (LHC) produces many energetic mesons with energies of several TeV in the very forward region of the collisions. The LHC forward (LHCf) experiment measures $\pi^0$, $\eta$, $K^0_s$ as well as single photons and neutrons with two detectors called as LHCf-Arm1 and Arm2, which were installed 140 m away from the ATLAS interaction point and cover the pseudorapidity region of η > 8.4. Each detector has two compact sampling and positioning calorimeters with the acceptances of $20\times20$ mm$^2$ and $40 \times 40$ mm$^2$ for Arm1 and $25 \times 25$ mm$^2$ and $32 \times 32$ mm$^2$ for Arm2. The calorimeter consists of tungsten, 16 GSO scintillator layers and 4 position sensitive layers of X-Y GSO-bar hodoscopes in Arm1 and silicon strip detectors in Arm2.
The LHCf conducted operation in 2015 and 2022 with pp collision at $\sqrt{s}$ = 13 and 13.6 TeV. In the obtained data, many photon pair events were found, and many of them were from decays of pi0 and eta with energies of > 0.6 TeV and > 3 TeV, respectively. In this presentation, we report the performance of $\pi^0$ and $\eta$ measurement as well as some results of their production cross-section. Additionally we discuss about possibility of $K^0_s$ measurement detecting four photon events from $K^0_s$ decay of $K^0_s \rightarrow 2\,\pi^0 \rightarrw 4 \gamma.