Abstract
At the CERN SPS, the DsTau project has been proposed to study tau-neutrino production aiming at providing important information for future ντ measurements. Precise measurement of the ντ cross section would enable a search for new physics effects in ντ charged current interactions. It also has practical implications for neutrino oscillation experiments. The dominant source of ντ is the sequential decay of Ds mesons produced by proton interactions, whose uncertainty dominates current uncertainty in the ντ cross section measurement. The project aims at reducing the systematic uncertainty from about 50% to 10% by measuring the Ds differential production cross section. For this purpose, emulsion detectors with a nanometre-precision readout will be used to detect small kinks of the Ds → τ decay. An emulsion detector has a position resolution of 50 nm, allowing for the detection of Ds → τ → X double kinks in a few millimeter range.
Highlights
Neutrino scattering, wherein the neutrino CC interaction cross sections are measured, can be used to study universality in the interactions of leptons
The main source of error in measuring DONUT’s ντ cross section is a result of systematic uncertainties, whereas 33% of the relative uncertainty is due to the limited number of detected ντ events
Owing to the lack of accurate measurements of the Ds differential production cross section, the DONUT result was not a single value but a ντ cross section as a function of a parameter n, which is responsible for the differential production cross section of Ds, as σνcτonst = 2.51n1.52 × 10−40 cm2 GeV−1
Summary
The DsTau project aims to study tau-neutrino production in high-energy proton interactions The results of this experiment are prerequisite for measuring the ντ charged-current (CC) cross section. In the situation described above, it is vital to measure the differential production cross section of Ds in high-energy proton interactions. It was rarely measured in previous experiments. This direct measurement of Ds → τ decays will provide an inclusive measurement of the Ds production and decay branching ratio to τ (Br (Ds → τ ) = (5.48±0.23)% [15]) This project aims to detect 1,000 Ds → τ decays in 2.3×108 proton interactions in tungsten target to study the differential production cross section of Ds mesons. The detector technology being developed for this project would be useful for future open charm measurements in heavy ion collisions
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