Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 5: Suche nach Neuen Teilchen I
T 5.8: Vortrag
Montag, 25. März 2019, 17:50–18:05, H07
Search for pair-produced leptoquarks decaying into quarks of the third and leptons of the first or second generation with the ATLAS experiment at √s=13 TeV — •Volker Austrup and Frank Ellinghaus — Bergische Universität Wuppertal
Motivated by similarities between the quark and lepton sectors in the Standard Model, leptoquarks (LQs) are hypothetical bosons that are assumed to couple to quarks and leptons at the same time.
First proposed in the 1980s, the initial model includes couplings only within one generation.
However, hints at flavor anomalies recently observed by various experiments such as LHCb, BaBar, and Belle have sparked interest in extended models with LQs coupling to quarks and leptons of different generations.
In this talk, the status of a search for pair-produced up-type (q=+2/3 e) and down-type (q=−1/3 e) LQs decaying into quarks of the third and leptons of the first or second generation is presented.
For this analysis, the final state of interest is LQu LQu → t ν + b e/µ and LQd LQd → t e/µ + b ν.
With a high momentum lepton and large missing transverse energy, this channel provides good separation between signal and background processes.
An overview of the analysis strategy, including the definition of signal and control regions, is given.
The studies shown are based on pp-collision data at a centre-of-mass energy of √s=13 TeV measured by the ATLAS experiment at the LHC between 2015 and 2018.