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10 lines
810 B
10 lines
810 B
\midheading{$e^-e^+ \nu_{\mu} \bar\nu_{\mu} $-pair production via WBF, processes 220,2201,222,2221}
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The {\it weak} processes ({\tt nproc=220,222}) occur in $O(\alpha^6)$,
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whereas the {\it strong} processes ({\tt nproc=2201,2221}) occur in $O(\alpha^4 \alpha_S^2)$.
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These processes can currently only be calculated at lowest order.
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\begin{eqnarray}
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&220 & f(p_1)+f(p_2) \to Z(e^-(p_3),e^+(p_4))Z(\mu-(p_5),\mu+(p_6)))+f(p_7)+f(p_8), [WBF] \nonumber \\
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&222 & f(p_1)+f(p_2) \to Z(e^-(p_3),e^+(p_4))Z(\nu_\mu(p_5),\bar{\nu}_\mu(p_6)))+f(p_7)+f(p_8) [WBF] \nonumber \\
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&2201 & f(p_1)+f(p_2) \to Z(e^-(p_3),e^+(p_4))Z(\mu^-(p_5),\mu^+(p_6)))+f(p_7)+f(p_8) [strong] \nonumber \\
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&2221 & f(p_1)+f(p_2) \to Z(e^-(p_3),e^+(p_4))Z(\nu_\mu(p_5),\bar{\nu}_\mu(p_6)))+f(p_7)+f(p_8) [strong] \nonumber
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\end{eqnarray}
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