Speaker
Description
The study of neutrino properties in the precision era of oscillation physics requires a superior
knowledge of the flux, flavor, and energy of neutrino beams. The NP06/ENUBET experiment is
designing a facility in which large angle leptons produced in kaon decays are monitored in a segmented
calorimeter instrumenting the decay tunnel walls. The pion component of the neutrino flux can be
monitored through muon stations after the hadron dump. Such complete beam diagnostics will bring
the systematics on the neutrino flavor and flux to the percent level. Furthermore, the narrow
momentum width (8.5 GeV/c +-10%) of the beam provides a precise measurement ($\mathcal{O}
$(10%)) of the neutrino energy on an event by event basis, thanks to its correlation with the radial
position of the interaction at the neutrino detector. ENUBET is therefore an ideal facility for a high
precision neutrino cross-section measurement at the GeV scale and the study of non-standard neutrino
models.
This contribution presents a new improved design of the proton target as well as the meson transfer
line. These improvements ensure a larger neutrino flux while preserving a purity in the lepton
monitoring similar to the one previously achieved. We report the final design of the ENUBET
demonstrator for the instrumented decay tunnel, which has been determined based on the results
obtained during the 2016-2018 test-beam campaign. This model will be exposed to particle beams in
2022 to prove the scalability and performance of the detector technology. We also discuss studies on
the design of an alternative secondary beamline with a broad momentum range (4, 6, 8.5 GeV/c), that
could enhance the physics reach of the facility.
Finally, we outline the progress on the full simulation of the ENUBET facility and the lepton
reconstruction, towards the full assessment of neutrino flux systematics.