26-30 July 2021
Europe/Berlin timezone

Measuring TeV neutrinos with FASERnu in the LHC Run-3

28 Jul 2021, 09:50


Parallel session talk Neutrino Physics T04: Neutrino Physics


Tomoko Ariga (Kyushu University (JP))


The FASER$\nu$ detector at the LHC has been designed to study neutrinos at the highest man-made energies. The detector will be located 480 m downstream of the ATLAS interaction point, and will take data starting in 2022. With FASER$\nu$, the three-flavor neutrino cross-sections will be measured in the currently unexplored energy range between 360 GeV and 5 TeV. In particular, tau-neutrino and electron-neutrino cross sections will be measured at the highest energy ever.

In 2018 we performed a pilot run with the aims of measuring particle fluxes at the proposed detector location and of possibly detecting neutrino interactions for the first time at the LHC. We installed a 30-kg lead/tungsten emulsion detector and collected data of 12.2 fb$^{-1}$. The analysis of this data has yielded several neutrino interaction candidates, excluding the no-signal hypothesis at the 2$\sigma$ level. We have also studied the charged particle flux (mainly muons) in regard to the characterization of the unprecedented collider neutrino beamline.

During Run-3 of the LHC starting from 2022, we will deploy an emulsion detector with a target mass of 1.1 tons, coupled with the FASER magnetic spectrometer. This would yield roughly 1,300 $\nu_e$, 9,000 $\nu_{\mu}$, and 30 $\nu_{\tau}$ interacting in the detector. Here we present the status and plan of FASER$\nu$, as well as the neutrino detection in the 2018 data.

Collaboration / Activity FASER Collaboration

Primary author

Tomoko Ariga (Kyushu University (JP))

Presentation Materials