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i am studying Simplified Models for the search of Dark Matter at colliders. In particular there are 2 different kind of models that i am studying that are s-channel and t-channel models. Now, there is something that i don't understand related to the mono-jet process.

Here is a paper that shows some of these models: https://arxiv.org/pdf/1603.08002v2.pdf

s-channel models are models in which the new mediator is exchanged in the s-channel when dealing with Dark Matter annihilation, while in t-channel models is exchanged in the t-channel during this process.

Since we are not able to detect DM, we have to look at processes that involves jets in the output.

If you look at page 22 of the paper i linked, there are some diagrams of these kind of processes for the s-channel. All of them involve loops and i don't understand why. Why a process like the ones for the t-channel in page 28 cannot happen? I read that there are difference in the two models in mono-jet production, but i don't understand why there cannot be tree-level scattering in the s-channel one.

Thank you for the help,

Luca

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# A Mono-jet searches for simplified models

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