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friis |
1.1 |
The dominant (There are also some rare decays to kaons, but these are not
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| 2 |
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considered here.) hadronic decays of taus consist of a varying number of
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| 3 |
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charged and neutral pions. The neutral pions undergo prompt decay to photon
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pairs. These decays proceed through intermediate resonances, given in
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table~\ref{table:decay_modes}. Each of these decay modes uniquely maps to a
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tau final state multiplicity, and each resonance has a different invariant
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mass. This implies that the problem of hadronic tau identification can be
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reframed from a global search for collimated hadrons under the tau mass and
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ensemble of searches for single production of the various decay resonances
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given in table~\ref{table:decay_modes}. In this paper, we present a novel
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| 11 |
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algorithm, the ``Tau Neural Classifier'' (TaNC) which uses this approach to
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improve on traditional tau-ID strategies.
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\begin{table}
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\caption{Visible products of hadronic tau decays}
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\centering
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\begin{tabular}{ l c r r }
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Visible Decay Products & Resonance & Mass (M$e$V/$c^2$) & Fraction \\
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\hline
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| 20 |
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$\pi^{-}$ & n/a & 135 & fixme \\
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| 21 |
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$\pi^{-}\pi^0$ & $\rho$ & 770 & fixme \\
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| 22 |
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$\pi^{-}\pi^0\pi^0$ & $a1$ & 1200 & fixme \\
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| 23 |
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$\pi^{-}\pi^{-}\pi^{+}$ & $a1$ & 1200 & fixme \\
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| 24 |
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$\pi^{-}\pi^{-}\pi^{+}\pi^0$ & $a1$ & 1200 & fixme \\
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| 25 |
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\hline
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Total & & & 65\% \\
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| 27 |
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\end{tabular}
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| 28 |
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\label{table:decay_modes}
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| 29 |
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\end{table}
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