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19 lines
1017 B
19 lines
1017 B
\bottomheading{Scalar mediator, processes 802 and 822}
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802~$ S\to({\chi}(p_3)+\bar{\chi}(p_4)) +f(p_5)$ [Scalar Mediator] NLO \\
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822~$S\to({\chi}(p_3)+\bar{\chi}(p_4)) +\gamma(p_5) $[Scalar Mediator] NLO + F
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Processes 802 and 822 produce the
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mono-jet or mono-photon signature through the following scalar operator,
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\begin{eqnarray}
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\mathcal{O}_S=\frac{\Delta(\overline{\chi}\chi)(\overline{q}q)}{\Lambda^2}~,
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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 vector operators from $(L+R)$. Therefore you
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should ensure that the Left and right-handed couplings are equal in
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{\tt dm\_parameters.DAT}. For these processes $\Delta$ is fixed from
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the value of {\tt [Yukawa Scalar Couplings] } if this is {\tt .true.}
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then $\Delta=m_q/\Lambda$ else $\Delta=1$.
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