-channel dark matter simplified models and unitarity

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• 作者：Christoph Englert^a ; ^{christoph.englert@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; Matthew McCullough^b ; ^{matthew.mccullough@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; Michael Spannowsky^c ; ^{michael.spannowsky@durham.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Collider dark matter
• 刊名：Physics of the Dark Universe
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：14
• 期：Complete
• 页码：48-56
• 全文大小：710 K

文摘

The ultraviolet structure of s$s$-channel mediator dark matter simplified models at hadron colliders is considered. In terms of commonly studied s$s$-channel mediator simplified models it is argued that at arbitrarily high energies the perturbative description of dark matter production in high energy scattering can break down. This is analogous to the well documented breakdown of an EFT description of dark matter collider production. With this in mind, to diagnose whether or not the use of simplified models at the LHC is valid, perturbative unitarity of the scattering amplitude in the processes relevant to LHC dark matter searches is studied. The results are as one would expect: at the LHC and future proton colliders the simplified model descriptions of dark matter production are in general valid. As a result of the general discussion, a simple class of ‘Fermiophobic Scalar’ simplified models is proposed, in which a scalar mediator couples to electroweak vector bosons. The Fermiophobic simplified model is well motivated and exhibits interesting collider and direct detection phenomenology.