Tag: physics
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Presentations about FASER
Invitations for conference talks by the FASER Collaboration should be sent to the Co-Spokepersons: Jonathan Feng (UC Irvine), jlf AT uci.edu Brian Petersen (CERN), Brian.Petersen AT cern.ch Meetings, Conferences and Workshops Seminars 2 January 2026
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Neutrino program
Since their discovery at a nuclear reactor in 1956, neutrinos have been detected from a variety of sources: beam dump experiments, cosmic ray interactions in the atmosphere, the Sun, the Earth, supernovae, and other astrophysical bodies outside our galaxy. The detection of neutrinos from these many sources has led to profound insights across the fields…
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BSM program
FASER searches for highly displaced signals from light and extremely weakly interacting particles that can be copiously produced in proton-proton collisions at the LHC. The existence of such new particles beyond the Standard Model (BSM) of elementary particles is a core theoretical prediction of many models of fundamental interactions trying to solve some of the…
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FASER neutrino detector
To date, no neutrino produced at a particle collider has ever been detected, despite the fact that colliders are copious sources of neutrinos. In LHC Run 3 during 2021-23 at 14 TeV center-of-mass energy, roughly 1011 electron neutrinos, 1012 muon neutrinos, and 109 tau neutrinos (along with comparable numbers of anti-neutrinos) will be produced in…
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Trigger and data acquisition
Decays of new light, long-lived particles inside FASER will trigger the detector to store information about the event in the data acquisition (DAQ) system. For redundancy and to detector efficiency measurements, all scintillator layers as well as the calorimeter provide triggering functionality. The scintillator trigger threshold is below that of a single minimum ionizing particle,…
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Tracker
The FASER tracker has been designed to separate and detect two high-energy, oppositely charged tracks originating from a common vertex in the decay volume. For this purpose, three tracking stations are employed, which are separated by two 1 m-long magnets deflecting the charged particle trajectories. The first tracking station is situated right after the decay…
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Magnets
To achieve sufficient separation of pairs of oppositely charged, high-energy Standard Model particles originating from decays of new physics particles, FASER is equipped with strong magnets designed and manufactured by the CERN magnet group to fulfill technical requirements dictated by the architecture of the TI12 tunnel. FASER uses 0.55 T permanent dipole magnets (see Fig.…
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Scintillators
The FASER experiment has four scintillator stations that are used to veto charged particles entering the decay volume from the direction of the ATLAS IP. These are used for both triggering and inducing preshowers. The first two stations are the veto stations located in front of the dipole magnets and are primarily used to suppress…
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Detector environment
The LHC infrastructure naturally shields the FASER location in tunnel TI12 from most particles produced at the ATLAS IP. The remaining high-energy particles that can reach FASER are muons and neutrinos. Although most of the high-energy muons are deflected by the LHC magnets, some of them can still reach FASER. This is especially true for…