LHC Dark Matter Working Group: Next-generation spin-0 dark matter models

• Published in: PHYSICS OF THE DARK UNIVERSE Vol. 27; no. C; p. 100351
• Main Authors: Abe, Tomohiro, Afik, Yoav, Albert, Andreas, Anelli, Christopher R., Barak, Liron, Bauer, Martin, Behr, J. Katharina, Bell, Nicole F., Boveia, Antonio, Brandt, Oleg, Busoni, Giorgio, Carpenter, Linda M., Chen, Yu-Heng, Doglioni, Caterina, Elliot, Alison, Fujiwara, Motoko, Genest, Marie-Helene, Gerosa, Raffaele, Gori, Stefania, Gramling, Johanna, Grohsjean, Alexander, Gustavino, Giuliano, Hahn, Kristian, Haisch, Ulrich, Henkelmann, Lars, Hisano, Junji, Huitfeldt, Anders, Ippolito, Valerio, Kahlhoefer, Felix, Landsberg, Greg, Lowette, Steven, Maier, Benedikt, Maltoni, Fabio, Muehlleitner, Margarete, No, Jose M., Pani, Priscilla, Polesello, Giacomo, Price, Darren D., Robens, Tania, Rovelli, Giulia, Rozen, Yoram, Sanderson, Isaac W., Santos, Rui, Sevova, Stanislava, Sperka, David, Sung, Kevin, Tait, Tim M.P., Terashi, Koji, Ungaro, Francesca C., Vryonidou, Eleni, Yu, Shin-Shan, Wu, Sau Lan, Zhou, Chen
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.01.2020; Elsevier
• Subjects: Fysik; High Energy Physics - Experiment; High Energy Physics - Phenomenology; Natural Sciences; Naturvetenskap; Physical Sciences; Physics; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Subatomic Physics; Subatomär fysik; dark matter: coupling; parameter space; experimental results; coherence; dark matter: interaction; signature; dark matter: direct detection; transverse energy: missing-energy; CMS; CERN LHC Coll; spin: 0; dark matter: production; dark matter: mediation; upper limit; interpretation of experiments; ATLAS; doublet; new physics: search for; pseudoscalar; dark matter: relic density; dark matter: spin
• ISSN: 2212-6864; 2212-6864
• DOI: 10.1016/j.dark.2019.100351

Dark matter (DM) simplified models are by now commonly used by the ATLAS and CMS Collaborations to interpret searches for missing transverse energy (ETmiss). The coherent use of these models sharpened the LHC DM search program, especially in the presentation of its results and their comparison to DM direct-detection (DD) and indirect-detection (ID) experiments. However, the community has been aware of the limitations of the DM simplified models, in particular the lack of theoretical consistency of some of them and their restricted phenomenology leading to the relevance of only a small subset of ETmiss signatures. This document from the LHC Dark Matter Working Group identifies an example of a next-generation DM model, called 2HDM+a, that provides the simplest theoretically consistent extension of the DM pseudoscalar simplified model. A comprehensive study of the phenomenology of the 2HDM+a model is presented, including a discussion of the rich and intricate pattern of mono-X signatures and the relevance of other DM as well as non-DM experiments. Based on our discussions, a set of recommended scans are proposed to explore the parameter space of the 2HDM+a model through LHC searches. The exclusion limits obtained from the proposed scans can be consistently compared to the constraints on the 2HDM+a model that derive from DD, ID and the DM relic density.