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18 lines
1.0 KiB
18 lines
1.0 KiB
\bottomheading{Vector mediator, processes 800 and 820}
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800~$ V\to({\chi}(p_3)+\bar{\chi}(p_4)) +f(p_5) $ [Vector Mediator] NLO \\
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820~$V\to({\chi}(p_3)+\bar{\chi}(p_4)) +\gamma(p_5)$ [Vector Mediator] NLO
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Processes 800 and 820 produce the
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mono-jet or mono-photon signature through the following vector operator,
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\begin{eqnarray}
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\mathcal{O}_V=\frac{(\overline{\chi}\gamma_{\mu}\chi)(\overline{q}\gamma^{\mu}q)}{\Lambda^2}~,\label{eq:OV}
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\end{eqnarray}
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These processes are available at NLO and include the usual treatment of photons. See for instance the $V\gamma$
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processes ($\sim$ 300) in this
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manual for more details on photon setup in MCFM. As discussed above the code will calculate left and right-handed
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helicity amplitudes and build the
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vector operators from $(L+R)$. Therefore you should ensure that the Left and right-handed couplings are equal in {\tt
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dm\_parameters.DAT}.
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Processes 840 and 845 represent the production of DM plus two jets or DM plus one jet and one photon and are available
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at LO.
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