Lepton universality in tau-neutrino (ντ) scattering has been poorly tested. More precise measurement of the ντ cross section would enable a search for new physics effects in ντ-nucleon CC interactions. Such measurement also has practical importance for next-generation neutrino oscillation experiments and astrophysical ντ observations. The DsTau project has been proposed at CERN SPS to study tau-neutrino production with the aim of providing important data for future ντ measurements. For ντ cross section measurements, the practical method of producing an artificial ντ beam employs the sequential decay of Ds mesons produced in high-energy proton interactions. However, there has been no experimental measurement of the Ds differential production cross section in fixed-target experiments using proton beams, which leads to a large systematic uncertainty on the ντ flux estimation. The DsTau project aims to reduce this uncertainty in the current cross section measurement from about 50% to 10% by measuring the Ds differential production cross section. For this purpose, emulsion detectors with a 50-nm spatial resolution will allow the detection of Ds → τ → X double kinks in a few mm range. Results from the beam tests conducted in 2016-2017 are presented together with a prospect for the pilot run in 2018 and the physics run in 2021.
|Journal||Proceedings of Science|
|Publication status||Published - 2019|
|Event||39th International Conference on High Energy Physics, ICHEP 2018 - Seoul, Korea, Republic of|
Duration: Jul 4 2018 → Jul 11 2018
All Science Journal Classification (ASJC) codes