Unitarisation of EFT amplitudes for dark matter searches at the LHC

Nicole F. Bell, Giorgio Busoni*, Archil Kobakhidze, David M. Long, Michael A. Schmidt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We propose a new approach to the LHC dark matter search analysis within the effective field theory framework by utilising the K-matrix unitarisation formalism. This approach provides a reasonable estimate of the dark matter production cross section at high energies, and hence allows reliable bounds to be placed on the cut-off scale of relevant operators without running into the problem of perturbative unitarity violation. We exemplify this procedure for the effective operator D5 in monojet dark matter searches in the collinear approximation. We compare our bounds to those obtained using the truncation method and identify a parameter region where the unitarisation prescription leads to more stringent bounds.

Original languageEnglish
Article number125
JournalJournal of High Energy Physics
Volume2016
Issue number8
DOIs
Publication statusPublished - 1 Aug 2016
Externally publishedYes

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