Production asymmetry of ντ neutrinos and ν ¯ τ $$ {\overline{\nu}}_{\tau } $$ antineutrinos from a fixed target experiment SHiP
Abstract We discuss how to calculate cross sections as well as rapidity, transverse momentum and energy distributions of ντ and ν ¯ τ $$ {\overline{\nu}}_{\tau } $$ produced from the direct D s ± → ν τ / ν ¯ τ $$ {D}_s^{\pm}\to {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ and chain D s ± → τ + / τ − →...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2020-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP01(2020)116 |
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| Summary: | Abstract We discuss how to calculate cross sections as well as rapidity, transverse momentum and energy distributions of ντ and ν ¯ τ $$ {\overline{\nu}}_{\tau } $$ produced from the direct D s ± → ν τ / ν ¯ τ $$ {D}_s^{\pm}\to {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ and chain D s ± → τ + / τ − → ν τ / ν ¯ τ $$ {D}_s^{\pm}\to {\tau}^{+}/{\tau}^{-}\to {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ decays in p+96 Mo scattering with proton beam Elab = 400 GeV i.e. at s NN $$ {\sqrt{s}}_{NN} $$ = 27.4 GeV. The τ decays are simulated with the help of the Tauola code and include multiple decay channels of τ in amounts proportional to their branching ratios. In our calculations we include D s ± $$ {D}_s^{\pm } $$ from charm fragmentation c → D s + $$ {D}_s^{+} $$ and c ¯ → D s − $$ \overline{c}\to {D}_s^{-} $$ as well as those from subleading fragmentation of strange quarks/antiquarks s → D s − $$ {D}_s^{-} $$ and s ¯ → D s + $$ \overline{s}\to {D}_s^{+} $$ . The s ≠ s ¯ $$ s\ne \overline{s} $$ asymmetry of the strange quark content of proton is included. The different contributions to D s + $$ {D}_s^{+} $$ and ν τ / ν ¯ τ $$ {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ are shown explicitly. We discuss and quantify a not discussed so far effect of asymmetries for production of ντ and ν ¯ τ $$ {\overline{\nu}}_{\tau } $$ caused by subleading fragmentation mechanism and discuss related uncertainties. A potential measurement of the asymmetry is discussed. Estimates of a number of observed ν τ / ν ¯ τ $$ {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ in the ν τ / ν ¯ τ $$ {\nu}_{\tau }/{\overline{\nu}}_{\tau } $$ +208Pb 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. |
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| ISSN: | 1029-8479 |