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The first results of the study of high-energy electron neutrino (𝜈𝑒) and muon neutrino (𝜈𝜇) charged-current interactions in the FASER⁢𝜈 emulsion-tungsten detector of the FASER experiment at the LHC are presented. A 128.8 kg subset of the FASER⁢𝜈 volume was analyzed after exposure to 9.5 fb−1 of √𝑠=13.6 TeV 𝑝⁢𝑝 data. Four (eight) 𝜈𝑒 (𝜈𝜇) interaction candidate events are observed with a statistical significance of 5.2⁢𝜎 (5.7⁢𝜎). This is the first direct observation of 𝜈𝑒 interactions at a particle collider and includes the highest-energy 𝜈𝑒 and 𝜈𝜇 ever detected from an artificial source. The interaction cross section per nucleon 𝜎/𝐸𝜈 is measured over an energy range of 560–1740 GeV (520–1760 GeV) for 𝜈𝑒 (𝜈𝜇) to be (1.2+0.8 −0.7)×10−38 cm2 GeV−1 [(0.5±0.2)×10−38 cm2 GeV−1], consistent with standard model predictions. These are the first measurements of neutrino interaction cross sections in those energy ranges.

First Measurement of

ν_{e}

and

ν_{μ}

Interaction Cross Sections at the LHC with FASER’s Emulsion Detector

https://doi.org/10.1103/PhysRevLett.133.021802

Abraham, Roshan Mammen; Anders, John; Antel, Claire; Ariga, Akitaka; Ariga, Tomoko; Atkinson, Jeremy; Bernlochner, Florian U; Boeckh, Tobias; Boyd, Jamie; Brenner, Lydia; et al (July 2024, Physical Review Letters)

The first results of the study of high-energy electron neutrino (

ν_{e}

) and muon neutrino (

ν_{μ}

) charged-current interactions in the

FASER ν

emulsion-tungsten detector of the FASER experiment at the LHC are presented. A 128.8 kg subset of the

FASER ν

volume was analyzed after exposure to

9.5 {fb}^{- 1}

\sqrt{s} = 13.6 TeV

p p

data. Four (eight)

ν_{e}

(

ν_{μ}

) interaction candidate events are observed with a statistical significance of

5.2 σ

(

5.7 σ

). This is the first direct observation of

ν_{e}

interactions at a particle collider and includes the highest-energy

ν_{e}

and

ν_{μ}

ever detected from an artificial source. The interaction cross section per nucleon

σ / E_{ν}

is measured over an energy range of 560–1740 GeV (520–1760 GeV) for

ν_{e}

(

ν_{μ}

) to be

({1.2}_{- 0.7}^{+ 0.8}) \times 10^{- 38} {cm}^{2} {GeV}^{- 1}

[

(0.5 \pm 0.2) \times 10^{- 38} {cm}^{2} {GeV}^{- 1}

], consistent with standard model predictions. These are the first measurements of neutrino interaction cross sections in those energy ranges. Published by the American Physical Society2024

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