Measuring the Dark Force at the LHC

Details Measuring the Dark Force at the LHC Measuring the Dark Force at the LHC

2009-02-02

arxiv.org/abs/0902.0006v2

Phys.Rev.Lett.103:051801,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures; final version for PRL

Scientific paper

10.1103/PhysRevLett.103.051801

A long-range ``dark force'' has recently been proposed to mediate the dark matter (DM) annihilation. If DM particles are copiously produced at the Large Hadron Collider (LHC), the light dark force mediator will also be produced through radiation. We demonstrate how and how precise we can utilize this fact to measure the coupling constant of the dark force. The light mediator's mass is measured from the ``lepton jet'' it decays to. In addition, the mass of the DM particle is determined using the MT2 technique. Knowing these quantities is critical for calculating the DM relic density.

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