23-28 June 2014
Amsterdam
Europe/Zurich timezone

Using Energy Peaks to Count Dark Matter Particles in Decays

23 Jun 2014, 14:45
15m
Room 3 (Tuschinski Theatre)

Room 3

Tuschinski Theatre

Presentation Particle Physics Particle Physics

Speaker

Roberto Franceschini (E)

Description

We study the determination of the symmetry that stabilizes a dark matter (DM) candidate produced at colliders. Our question is motivated per se, and by several alternative symmetries that appear in models that provide a DM particle. To this end, we devise a strategy to determine whether a heavy mother particle decays into one visible massless particle and one or two DM particles. The counting of DM particles in these decays is relevant to distinguish the minimal choice of Z2 from a Z3 stabilization symmetry, under which the heavy particle and the DM are charged and the visible particle is not. Our method is novel in that it chiefly uses the peak of the energy spectrum of the visible particle and only secondarily uses the MT2 endpoint of events in which the heavy mother particles are pair-produced. We present new theoretical results concerning the energy distribution of the decay products of a three-body decay, which are crucial for our method. To demonstrate the feasibility of our method in investigating the stabilization symmetry, we apply it in distinguishing the decay of a bottom quark partner into a b quark and one or two DM particles. The method can be applied generally to distinguish two- and three-body decays, irrespective of DM.

Primary author

Co-authors

Doojin Kim (University of Maryland) Kaustubh Agashe (University of Maryland) Kyle Wardlow (University of Maryland)

Presentation Materials