Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Suche nach Dunkler Materie 1 (LHC)

T 10.6: Vortrag

Montag, 27. März 2017, 18:00–18:15, VSH 116

Search for dark matter in events with a Z boson and missing transverse energy at CMS — •Andreas Albert, Thomas Hebbeker, and Arnd Meyer — III. Physikalisches Institut A, RWTH Aachen University, Aachen

Understanding the origin of dark matter (DM) is one of the most pressing tasks in physics today. As ample astrophysical evidence has shown, DM occupies a significant fraction of the cosmological energy budget, for which the standard model of particle physics cannot account. If DM consists of particles, it may be produced in particle collisions.

A search for dark matter in proton-proton collision events with a center-of-mass energy of 13 TeV at the CERN LHC is presented. The analysis is based on a dataset corresponding to an integrated luminosity of approximately 36/fb collected in the CMS experiment in 2016. Since hypothetical DM particles would not be directly detectable in CMS, events with large missing transverse energy (MET) are selected. Additionally, a muon or electron pair compatible with the decay of a Z boson from initial state radiation is required in order to select a well-defined topology. A shape analysis of the MET spectrum then allows to search for a signal.

In addition to DM production, the search can be interpreted in terms of other new physics phenomena producing undetectable particles, such as unparticles and gravitons.

Following an introduction to the analysis concepts, recent developments in the used experimental techniques and results of the analysis are presented.