Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 90: Suche nach Supersymmetrie IV (langlebige Zustände, RPV)

T 90.2: Vortrag

Donnerstag, 3. März 2016, 17:00–17:15, VMP5 HS B2

Prospects of a search for charged stable massive particles in LHC Run-2 pp collisions with the ATLAS detector — •Jochen Jens Heinrich and Sascha Mehlhase — Ludwig-Maximilians-Universität München

Many theories beyond the Standard Model predict the existence of new long-lived heavy charged particles that can be produced in LHC proton–proton collisions at √s=13 TeV. If their lifetimes are large enough to enable them to traverse large parts of the detector before decaying we speak of stable massive particles (SMPs). SMPs do not form extensive showers in the calorimeters and therefore present a muon-like signature that propagates much slower than the speed of light. A direct search for SMPs can be conducted, which provides a largely model independent signature with only a small instrumental background. It also expands coverage in new particle searches, as it is an orthogonal approach to generic new particle searches. SMPs are identified by determining their velocity via measurements of their anomalous ionisation energy losses in the inner tracker and time-of-flight measurements carried out in the calorimeter and muon system. All involved subsystems require extensive calibrations. Status and plans of a full-detector SMP search with the ATLAS detector are presented. Further, a new dedicated slow-muon trigger is introduced that takes the delayed arrival of SMP candidates in the muon system into account by considering two consecutive bunch crossings (BCs). It requires a jet or missing energy in the first BC and a muon signature coming from the delayed SMP in the immediately following BC.