| Report number | arXiv:2507.23552 ; CERN-FASER-CONF-2025-004 |
| Title | Latest neutrino results from the FASER experiment and their implications for forward hadron production |
| Publication | 2025-09-24 |
| Collaboration | FASER collaboration |
| Imprint | 04-07-2025 |
| Number of pages | 10 |
| Note | 10 pages, 2 figures, Presented to the 39th International Cosmic Ray Conference (ICRC2025) |
| Published in: | PoS ICRC2025 (2025) 349 |
| Presented at | 39th International Cosmic Ray Conference (ICRC 2025), Geneva, Switzerland, 14 - 24 Jul 2025, pp.349 |
| DOI | 10.22323/1.501.0349 |
| Subject category | Particle Physics - Experiment |
| Accelerator/Facility, Experiment | CERN LHC ; FASER |
| Keywords | FASERnu ; neutrino flux ; hadronic interaction |
| Abstract | The muon puzzle --- an excess of muons relative to simulation predictions in ultra-high-energy cosmic-ray air showers --- has been reported by many experiments. This suggests that forward particle production in hadronic interactions is not fully understood. Some of the scenarios proposed to resolve this predict reduced production of forward neutral pions and enhanced production of forward kaons (or other particles). The FASER experiment at the LHC is located 480 m downstream of the ATLAS interaction point and is sensitive to neutrinos and muons, which are the decay products of forward charged pions and kaons. In this study, the latest measurements of electron and muon neutrino fluxes are presented using the data corresponding to 9.5 fb$^{-1}$ and 65.6 fb$^{-1}$ of proton-proton collisions with $\sqrt{s}=13.6$ TeV by the FASER$\nu$ and the FASER electronic detector, respectively. These fluxes are compared with predictions from recent hadronic interaction models, including EPOS-LHCr, SIBYLL 2.3e, and QGSJET 3. The predictions are generally consistent with the measured fluxes from FASER, although some discrepancies appear in certain energy bins. More precise flux measurements with additional data will follow soon, enabling validation of pion, kaon, and charm meson production with finer energy binning, reduced uncertainties, and multi-differential analyses. |
| Other source | Inspire |
| Copyright/License | publication: © 2025-2026 The Author(s) (License: CC-BY-NC-ND-4.0) preprint: (License: CC BY-NC-ND 4.0) |
| Submitted by | flxkling@gmail.com |
Record created 2025-06-23, last modified 2026-04-20
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