Latest Results from the FASER Experiment

TL;DR

The FASER experiment at the LHC reports new results including dark photon searches, neutrino interaction measurements, and the first observation of electron neutrinos in its detector, utilizing extensive Run 3 data.

Contribution

This paper presents the latest physics results from FASER, including world-leading dark photon exclusion limits and first neutrino interaction measurements with new detection techniques.

Findings

World-leading exclusion limits on dark photons.

First observation of electron neutrinos in FASER.

Double-differential measurement of muon neutrino interactions.

Abstract

We present the latest physics results from the FASER experiment at the LHC. Using $pp$ collision data at $\sqrt{s} = 13.6$ TeV collected during LHC Run 3, FASER reports new results on four fronts: a search for dark photons with an improved analysis strategy using $177~fb^{-1}$ of data, yielding world-leading exclusion limits; neutrino cross section measurements and the first search for charm hadron production in neutrino interactions, both using the FASER$\nu$ emulsion detector with a 681 kg tungsten target and $9.5~fb^{-1}$ of 2022 data; the first observation of $\nu_e$ in the FASER electronic detector at $5.5\sigma$ using $176.8~fb^{-1}$ of data; and the first double-differential measurement of $\nu_\mu$ interactions as a function of energy and rapidity with $186~fb^{-1}$ of data.