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21 lines
1.2 KiB
21 lines
1.2 KiB
\bottomheading{Axial vector mediator, processes 801 and 821}
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801~$ A\to({\chi}(p_3)+\bar{\chi}(p_4)) +f(p_5)$ [Axial Vector Mediator] NLO \\
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821~$A\to({\chi}(p_3)+\bar{\chi}(p_4)) +\gamma(p_5) $[Axial Vector Mediator] NLO + F
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Processes 801 and 821 produce the
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mono-jet or mono-photon signature through the following axial-vector operator,
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\begin{eqnarray}
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\mathcal{O}_A=\frac{(\overline{\chi}\gamma_{\mu}\gamma_5\chi)(\overline{q}\gamma^{\mu}\gamma_5q)}{\Lambda^2}~,\label{eq:OA}
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\end{eqnarray}
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These processes are available at NLO and include the usual treatment
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of photons. See for instance the $V\gamma$ processes ($\sim$ 300) in
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this manual for more details on photon setup in MCFM. As discussed
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above the code will calculate left and right-handed helicity
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amplitudes and build the axial vector operators from $(L-R)$. By
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default the code will enforce the right handed couplings to equal to
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the negative of the left handed couplings, if this is not
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already the case in {\tt dm\_parameters.DAT}. Therefore the user does
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not have to change this file when switching between vector and axial
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vector operators. Processes 841 and 846 represent the production of
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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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