Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Top-Physik I

T 35.8: Talk

Tuesday, March 26, 2019, 17:45–18:00, S10

Search for tH production via FCNC in the H->bb decay channel — •Arunika Sahu — Bergische Universitaet Wuppertal

Processes involving flavour-changing neutral currents (FCNC) are highly suppressed in the top-quark sector. Any observations of such processes would therefore be a signal for physics beyond the Standard Model. The FCNC contributions in pp->tH process comes from qtH and qtg interactions at leading order. We assume the qtg coupling contributions to be negligible and consider only qtH coupling contributions. In the presented analysis, we search for the pp -> tH process, involving ctH and utH FCNC vertices. Final states are considered in which the top quark decays semi-leptonically and the Higgs boson decays into a pair. The challenging tt+bb (cc) background is estimated via dedicated control regions. Neural networks are employed to separate signal and background events in the signal region.