# ICHEP 2020

28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

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

31 Jul 2020, 11:15
15m
virtual conference

#### virtual conference

Talk 02. Neutrino Physics

### Speakers

Rafal Maciula (Institute of Nuclear Physics PAN) Antoni Szczurek (Institute of Nuclear Physics)

### Description

We discuss how to calculate cross sections as well as rapidity, transverse momentum and energy distributions of $\nu_{\tau}$ and ${\overline \nu}_{\tau}$ produced 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. Both direct neutrinos and neutrinos from $\tau$ lepton decays (chain decays) are included. The $\tau$ decays are simulated with the help of the \textsc{Tauola} code and include large number of decay channels. 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 $s \ne \bar s$ asymmetry of the strange quark content of proton is included. The different contributions to $D_s^{\pm}$ and $\nu_{\tau} / {\overline \nu}_{\tau}$ are shown explicitly. We discuss and quantify a not discussed so far effect of asymmetries for production of $\nu_{\tau}$ and ${\overline \nu}_{\tau}$ caused by (helicity) polarization of $\tau^{\pm}$ from the first (weak) decay $D_s^{\pm} \to \tau^{\pm}$. We try to estimate also effect of the production asymmetry caused by subleading fragmentation mechanism and discuss related uncertainties. A potential measurement of the asymmetry is discussed. 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 with the help of the NuWro program. We refer also to the production of the high-energy (anti)neutrinos in the atmosphere.

R. Maciuła, A. Szczurek, J. Zaremba and I. Babiarz,
"Production asymmetry of $\nu_{\tau}$ neutrinos and ${\overline \nu}_{\tau}$ antineutrinos from a fixed target experiment SHiP"
J. High Energy Phys. 01, 116 (2020).

### Primary authors

Rafal Maciula (Institute of Nuclear Physics PAN) Antoni Szczurek (Institute of Nuclear Physics)