PoS - Proceedings of Science
Volume 316 - XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG4-WG5 Joint Session
Study of tau neutrino production property with measuring open-Charms at 400 GeV proton beam dump
O. Sato*  on behalf of the DsTau Collaboration
Full text: pdf
Pre-published on: September 20, 2018
Published on: November 23, 2018
The property of tau neutrino is not well known, due to difficulty of its production and detection.
The comparison of the neutrino-nucleon cross-section of tau neutrinos and other neutrino flavours is one of the interesting topics.
The tau neutrino cross-section has been measured by the DONUT experiment, but with a large statistical error of $\sim30\%$ and a systematical uncertainty of $\sim50\%$.
The statistics of detected tau neutrinos will be improved by a planned experiment such as SHiP experiment at CERN in near future.
The DsTau collaboration aims to reduce the systematic uncertainty to $10\%$ by measuring the mother particles($Ds$ mesons) of tau neutrinos at the beam source.
$Ds$ mesons are generated by proton interactions with the beam dump target, which decay in sequence $Ds\rightarrow \tau + \nu_{\tau}$ and $\tau\rightarrow\nu_{\tau}+X$.
DsTau will collect 1000 $Ds\rightarrow \tau$ associated events in $2.3 \times 10^{8}$ proton interactions with the tungsten target using the 400 GeV/c proton beam at CERN SPS.
The rate and $x_{F}$ distribution of the $Ds$ production will be measured and the reduction of uncertainty on the tau neutrinos production will be achieved as the result.
Since $Ds$ and tau mass difference is small, the kink angle$(\sim7mrad)$ in the $Ds$ to tau trajectory within a short distance of a few mm decay flight is difficult to detect.
Emulsion Cloud Chambers, ECCs, dedicated structure with tungsten plates and nuclear emulsion plates are used to detect small angle kinks at $Ds$ to tau decays.
Since large number, $10^{5}$ events, of associated charm production will be accumulated and analyzed in ECCs, physics of open-charm could be studied as a byproduct.
The DsTau project introduction and results from small scale test exposure in 2016, 2017 are described.
DOI: https://doi.org/10.22323/1.316.0228
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