Pseudo-Dirac Dark Matter Leaves a Trace

Andrea De Simone, Veronica Sanz, and Hiromitsu Phil Sato
Phys. Rev. Lett. 105, 121802 – Published 16 September 2010

Abstract

Pseudo-Dirac dark matter is a viable type of dark matter which originates from a new Dirac fermion whose two Weyl states get slightly split in mass by a small Majorana term. The decay of the heavier to the lighter state naturally occurs over a detectable length scale. Thus, whenever pseudo-Dirac dark matter is produced in a collider, it leaves a clear trace: a visible displaced vertex in association with missing energy. Moreover, pseudo-Dirac dark matter behaves Dirac-like for relic abundance and Majorana-like in direct detection experiments. We provide a general effective field theory treatment, specializing to a pseudo-Dirac bino. The dark matter mass and the mass splitting can be extracted from measurements of the decay length and the invariant mass of the products, even in the presence of missing energy.

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  • Received 20 April 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.121802

© 2010 The American Physical Society

Authors & Affiliations

Andrea De Simone

  • Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

Veronica Sanz and Hiromitsu Phil Sato

  • Department of Physics and Astronomy, York University, Toronto, Ontario, M3J 1P3, Canada

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Issue

Vol. 105, Iss. 12 — 17 September 2010

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