Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 68: Neue Physik: Wimps, Monopole, Allgemeine Suchen
T 68.1: Vortrag
Mittwoch, 11. März 2015, 16:45–17:00, L.09.21 (HS 13)
WIMP search at the International Linear Collider — •Moritz Habermehl1,2, Andrii Chaus2, and Jenny List2 — 1Universität Hamburg, Germany — 2DESY Hamburg, Germany
Weakly Interacting Massive Particles (WIMPs, χ) are candidates for dark matter. At an electron-positron collider, the coupling of WIMPs to leptons can be probed. A study of direct WIMP pair production at the ILC and the prospects of measuring the parameters of the new particles will be presented. With an initial state radiation (ISR) photon associated to the process (e+e−→χχγ) WIMPs can be searched for without making assumptions on further new particles. As the WIMPs leave the detector unobserved the signal consits of a single photon with missing energy (γ + E/). The clean environment of lepton colliders with small systematics of electroweak backgrounds allows a precise study of such a mono-photon signal. With this method different mediator types can be tested using the effective operator approach. Exclusion ranges and discovery prospects are presented for the whole ILC energy range (250 GeV - 1 TeV) testing WIMP masses from 1 GeV to ≲ √s/2. Alternatively, an expected cross-section for e+e−→χχγ can be derived from the assumption that the observed relic density originates from the reverse process χχ→ SM particles. This study shows that WIMP pair production would be observable if the fraction χχ→ e+e−/χχ→ SM≈O(1%). The requirements on the detector design and on the accelerator parameters are studied. Examples are effects of the beam energy spectrum and the potential of polarised beams which leads to increased signal-to-background ratios for many of the coupling types studied.