Abstract
The neutrino factory is a facility for future precision studies of neutrino oscillations. A so-called near detector is essential for reaching the required precision for a neutrino oscillation analysis. The main task of the near detector is to measure the flux of the neutrino beam. Such a high intensity neutrino source like a neutrino factory provides also the opportunity for precision studies of various neutrino interaction processes in the near detector. We discuss the design concepts of such a detector. Results of simulations of a high resolution scintillating fiber tracker show that such a detector is capable of determining the neutrino flux normalization with an uncertainty of less than 1% by measuring pure leptonic interactions. Reconstruction of the neutrino energy in each event and a flux estimation based on the shapes of the neutrino energy spectra are discussed. A full setup of the near detector, consisting of a high granularity vertex detector, high resolution tracker, and muon catcher is also presented. Finally, a method to extrapolate the measured near detector flux to the far detector is shown, demonstrating that it is able to extract the correct values of ${\ensuremath{\theta}}_{13}$ and the $CP$ violation phase $\ensuremath{\delta}$ without any significant bias and with high accuracy.
Highlights
SUBTRACTIONIt is evident that an absolutely clean sample of signal events cannot be selected with a reasonable efficiency by employing selection cuts only
We have proposed a conceptual design for the tracker part of the neutrino factory near detector
An idealized detector geometry and simplified signal digitization was used in the Monte Carlo (MC) simulation
Summary
Neutrino-electron interaction cross sections are straightforward to calculate in the standard model [4]. There are two pure leptonic neutrino interactions that produce an energetic muon in the final state:. There are four pure leptonic neutrino reactions of interest, which are referred to as elastic scattering (ES), producing an energetic electron:. The angular spread comes mainly from the intrinsic scattering angle $4 mrad in these processes, while the neutrino beam divergence and solid angle covered by the detector make little contribution. This kinematic property can be used as another event selection criterion. NEUTRINO FACTORY NEAR DETECTOR separation between signal and background for all neutrinoelectron scattering processes, provided the lepton angle and energy are measured with sufficient precision.
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