Closing in on Asymmetric Dark Matter I

March-Russell, John, Unwin, James and west, Stephen

(2012)

March-Russell, John, Unwin, James and west, Stephen (2012) Closing in on Asymmetric Dark Matter I. Submitted

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Abstract

It is argued that experimental constraints on theories of asymmetric dark matter (ADM) almost certainly require that the DM be part of a richer hidden sector of interacting states of comparable mass or lighter. A general requisite of models of ADM is that the vast majority of the symmetric component of the DM number density must be removed in order to explain the observed relationship $\Omega_B\sim\Omega_{DM}$ via the DM asymmetry. Demanding the efficient annihilation of the symmetric component leads to a tension with experimental limits if the annihilation is directly to Standard Model (SM) degrees of freedom. A comprehensive effective operator analysis of the model independent constraints on ADM from direct detection experiments and LHC monojet searches is presented. Notably, the limits obtained essentially exclude models of ADM with mass 1GeV$\lesssim m_{DM} \lesssim$ 100GeV annihilating to SM quarks via heavy mediator states. This motivates the study of portal interactions between the dark and SM sectors mediated by light states. Resonances and threshold effects involving the new light states are shown to be important for determining the exclusion limits.

Information about this Version

This is a Draft version
This version's date is: 21/3/2012
This item is not peer reviewed

Link to this Version

https://repository.royalholloway.ac.uk/items/56a5414f-f3af-5673-f459-0b3adc3cc9ea/1/

Item TypeJournal Article
TitleClosing in on Asymmetric Dark Matter I
AuthorsMarch-Russell, John
Unwin, James
west, Stephen
DepartmentsFaculty of Science\Physics
Research Groups and Centres\Physics\Low Temperature Physics

Identifiers

Deposited by Research Information System (atira) on 24-May-2012 in Royal Holloway Research Online.Last modified on 24-May-2012

Notes

18+6 pages, 18 figures


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