The ENUBET Beamline

The ENUBET ERC project (2016-2021) is studying a narrow band neutrino beam where lepton production can be monitored at single particle level in an instrumented decay tunnel. This would allow to measure $\nu_{\mu}$ and $\nu_{e}$ cross sections with a precision improved by about one order of magnitude compared to present results. In this proceeding we describe a first realistic design of the hadron beamline based on a dipole coupled to a pair of quadrupole triplets along with the optimisation guidelines and the results of a simulation based on G4beamline. A static focusing design, though less efficient than a horn-based solution, results several times more efficient than originally expected. It works with slow proton extractions reducing drastically pile-up effects in the decay tunnel and it paves the way towards a time-tagged neutrino beam. On the other hand a horn-based transferline would ensure higher yields at the tunnel entrance. The first studies conducted at CERN to implement the synchronization between a few ms proton extraction and a horn pulse of 2-10 ms are also described.Comment: Poster presented at NuPhys2018 (London 19-21 December 2018). 4 pages, 3 figure

Testbeam performance of a shashlik calorimeter with fine-grained longitudinal segmentation

An iron- plastic-scintillator shashlik calorimeter with a 4.3 X0 longitudinal segmentation was tested in November 2016 at the CERN East Area facility with charged particles up to 5 GeV . The performance of this detector in terms of electron energy resolution, linearity, response to muons and hadron showers are presented in this paper and compared with simulation. Such a fine-grained longitudinal segmentation is achieved using a very compact light readout system developed by the SCENTT and ENUBET Collaborations, which is based on fiber-SiPM coupling boards embedded in the bulk of the detector. We demonstrate that this system fulfills the requirements for neutrino physics applications and discuss performance and additional improvements

ENUBET: the first monitored neutrino beam

The main source of systematic uncertainty on neutrino cross section measurements at the GeV scale originates from the poor knowledge of the initial flux. The goal of the ENUBET project is to cut down this uncertainty to 1\% by monitoring the charged leptons produced in association with neutrinos, through the instrumentation of the decay region of a conventional narrow-band neutrino beam. In this contribution we discuss the final design of the horn-less beamline, that allows for a 1\% measurement of νe and νμ cross sections in about 3 years of data taking at CERN-SPS using ProtoDUNE as far detector, together with the particle identification performance. We also present for the first time the impact of the lepton monitoring in the reduction of the hadroproduction systematic on the neutrino flux. Finaly, we give an overwiev of the current status of the final demonstrator to be tested with charged particles at CERN in October 2022