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24 lines
1.4 KiB
24 lines
1.4 KiB
\bottomheading{Pseudo scalar mediator, processes 803 and 823}
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803~$ PS\to({\chi}(p_3)+\bar{\chi}(p_4)) +f(p_5)$ [Pseudo Scalar Mediator] NLO \\
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823~$ PS\to({\chi}(p_3)+\bar{\chi}(p_4)) +\gamma(p_5) $[Pseudo Scalar Mediator] NLO + F
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Processes 803 and 823 produce the
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mono-jet or mono-photon signature through the following pseudo-scalar operator,
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\begin{eqnarray}
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\mathcal{O}_{PS}=\frac{m_q(\overline{\chi}\gamma_5\chi)(\overline{q}\gamma_5q)}{\Lambda^3}\label{eq:OPS}~.
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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 pseudo scalar 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 scalar and pseudo
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scalar 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. For these processes $\Delta$ is fixed from the value of {\tt
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[Yukawa Scalar Couplings] } if this is {\tt .true.} then
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$\Delta=m_q/\Lambda$ else $\Delta=1$.
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