Production of ${\nu }_{\tau }$ neutrinos and ${\overline{\nu }}_{t}au$ antineutrinos -- elaborate calculation for a fixed target experiment SHiP

Abstract

We discuss cross sections for ${\nu }_{\tau }$ and ${\overline{\nu }}_{\tau }$ production from the direct $D_s^{\pm }\to {\nu }_{\tau }/{\overline{\nu }}_{\tau }$ and chain $D_s^{\pm }\to {\tau }^{+}/{\tau }^{-}\to {\nu }_{\tau }/{\overline{\nu }}_{\tau }$ decays in $p{+}^{96}\mathrm{Mo}$ scattering with proton beam $E_{\mathrm{lab}}$ = 400 GeV \textit{i.e.} at ${\sqrt{s}}_{NN}$ = 27.4 GeV. In our calculations we include $D_s^{\pm }$ from charm fragmentation $c\to D_s^{+}$ and $\bar{c}\to D_s^{-}$ as well as those from subleading fragmentation of strange quarks/antiquarks $s\to D_s^{-}$ and $\bar{s}\to D_s^{+}$. The different contributions to $D_s^{\pm }$ and ${\nu }_{\tau }/{\overline{\nu }}_{\tau }$ production rates are shown explicitly. Estimates of a number of observed ${\nu }_{\tau }/{\overline{\nu }}_{\tau }$ in the ${\nu }_{\tau }/{\overline{\nu }}_{\tau }{+}^{208}\mathrm{Pb}$ reaction, with 2m long target are given.

Comments: talk given by R. Maciula at the 40th International Conference on High Energy physics - ICHEP2020, July 28 - August 6, 2020, Prague, Czech Republic (virtual meeting)