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T: Fachverband Teilchenphysik
T 71: Supersymmetry: Theory and searches
T 71.10: Vortrag
Donnerstag, 2. April 2020, 18:45–19:00, H-HS VI
Search for compressed mass-spectrum long-lived particles using short disappearing tracks with the ATLAS experiment — •Paul Gessinger1,2 and Stefan Tapprogge2 — 1CERN — 2Johannes Gutenberg-Universität Mainz
In certain Supersymmetry scenarios, the lightest neutalino χ10 and charginos χ1± can become nearly degenerate in mass. At mass splittings as low as Δ m( χ1±, χ10)≈100 MeV, the chargino obtains lifetimes of O(10 ps), which causes it to reach sensitive parts of the ATLAS experiment, before decaying mostly to a neutralino leaving the detector without interacting, and a low momentum charged pion that is difficult to detect. This causes the chargino track to disappear.
The tracking systems and reconstruction algorithms of the ATLAS detector are designed to efficiently detect and reconstruct charged particles crossing all sensor layers. Using specialized reconstruction techniques, it is possible to reconstruct short tracklets, which arise only from hits in the Pixel detector. Previous ATLAS analyses used tracklets consisting of 4 Pixel hits and no hits in the silicon strip detector as disappearing track signatures to search for the aforementioned scenarios in LHC pp-collisions at 13 TeV.
Building on efforts to reconstruct even shorter tracklets with only 3 Pixel hits and to reconstruct the soft charged pion, this talk will present the strategy and report on progress towards a dedicated pure-higgsino search, using established analysis techniques and new developments.