Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 26: Suche nach Supersymmetrie I

T 26.2: Vortrag

Dienstag, 20. März 2018, 16:45–17:00, Philo-HS3

Study on the expected sensitivity of Higgsino pair production at HL-LHC exploiting final states with missing transverse energy, soft leptons and monojet. — •Peter Tornambè — Albert Ludwigs Universität Freiburg

Supersymmetry (SUSY) is one of the most studied theories to extend the Standard Model (SM) beyond the electroweak scale. The ATLAS Collaboration published several SUSY searches with the 2015-2016 dataset which were able to exclude many different simplified models up to high masses. Supersymmetric particles like squarks and gluinos may be too heavy and not accessible by LHC with the current ongoing analysis. Naturalness arguments imply the existence of light electroweakino particles, when they have an high Higgsino component the mass splitting between them is expected to be really small. Due to this, the final products of the decay chain are very soft and the signals from electroweak Higgsino pair production is tipically overwhelmed by the Standard Model backgrounds. This talk will present the current upgrade study to estimate the exclusion power of High Luminosity LHC (HL-LHC), which will run at an energy in the center of mass of 14 TeV, for the natural mass range of a pure Higgsino scenario. Starting from theorethical proposals [arXiv:1409.7058], final states with two soft leptons, missing transverse energy and monojets from initial state radiation are considered in order to improve the ratio between signal and background.