Narrow Results

This talk is an attempt to present the current accelerator field status and assured prospects for elementary particle physics. The discussed subject is so rich that many interesting and important components of the picture are inevitably missing. The talk is updated version of my talk at HEP2005 International Europhysics Conference on High Energy Physics in Lisboa, Portugal.

The generation of neutrino beams at proton accelerators is a difficult scientific and engineering problem. To obtain narrow directional neutrino beams for experiments, intense extracted proton beams are used, secondary particles ($\pi$ and $K$ mesons) are generated at an external target. Further, to obtain parallel beams of these neutrino parent particles, high-current electromagnetic lenses are used. In this work, a surprisingly simple method based on a crystal focusing device has been proposed to obtain neutrino beams. Neutrino fluxes are calculated in comparison with the traditional scheme.

The knowledge of the initial flux in conventional neutrino beams represents the main limitation for a precision (1%) measurement of ${\nu }_e$ and ${\nu }_{\mu }$ cross-sections. The ENUBET ERC project is studying a facility based on a narrow-band beam capable of constraining the neutrino fluxes normalization through the monitoring of the associated charged leptons in an instrumented decay tunnel. In particular, the identification of large-angle positrons from $K_{e3}$ decays at single-particle level can reduce the ${\nu }_e$ flux uncertainty at the level of 1%. This setup would allow for an unprecedented measurement of the ${\nu }_e$ cross-section at the GeV scale. Such an experimental input would be highly beneficial to reduce the budget of systematic uncertainties in the next long baseline oscillation experiments. The ENUBET Collaboration presented at ICNFP 2020 the advances in the design and simulation of the hadron beamline, the optimization and performances of a 20 m long focusing transfer line, the design of an horn-based beamline, the results in terms of particle identification in the decay tunnel, and the final design of the ENUBET demonstrator for the instrumented decay tunnel.

This talk is an attempt to present the current accelerator field status and assured prospects for elementary particle physics. The discussed subject is so rich that many interesting and important components of the picture are inevitably missing. The talk is updated version of my talk at HEP2005 International Europhysics Conference on High Energy Physics in Lisboa, Portugal.