Abstract
FASER$\nu$ at the CERN Large Hadron Collider (LHC) is designed to directly detect collider neutrinos for the first time and study their cross sections at TeV energies, where no such measurements currently exist. In 2018, a pilot detector employing emulsion films was installed in the far-forward region of ATLAS, 480 m from the interaction point, and collected 12.2 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of 13 TeV. We describe the analysis of this pilot run data and the observation of the first neutrino interaction candidates at the LHC. This milestone paves the way for high-energy neutrino measurements at current and future colliders.
Highlights
There has been a long-standing interest in detecting neutrinos produced at colliders [1,2,3,4,5,6], but to date no collider neutrino has ever been directly detected
With respect to the ATLAS interaction point (IP), the TI18 tunnel is symmetric to TI12, where FASERν will be located in Large Hadron Collider (LHC) Run-3
A search for neutrino interactions is presented based on a small emulsion detector installed at the LHC in 2018
Summary
There has been a long-standing interest in detecting neutrinos produced at colliders [1,2,3,4,5,6], but to date no collider neutrino has ever been directly detected. Deployment on the beam collision axis maximizes the flux of all three neutrino flavors and allows FASERν to measure their interaction cross sections in the currently unexplored TeV energy range. An integrated luminosity of 12.2 fb−1 with an uncertainty of 2% measured by the ATLAS experiment [14,15] was collected during four weeks of data taking from September to October with pp collisions at 13-TeV center-of-mass energy. The entire lead module and 15% of the tungsten module were used in the following analysis; the remaining spare films in the tungsten module had data quality problems
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