Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Top quark production I

T 8.3: Talk

Monday, March 15, 2021, 16:30–16:45, Th

Sensitivity studies of differential cross-sections of t-channel single-top-quark production on physics beyond the standard model parameterised by effective field theories — •Mohsen Rezaei Estabragh¹, Wolfgang Wagner¹, Dominic Hirschbuehl¹, Joshua Aaron Reidelsturz¹, and Olga Bessidskaia Bylund² — ¹Bergische Universität Wuppertal, Wuppertal, Germany — ²University of Paris-Saclay

Unique features of the top quark such as its large mass and its decay before hadronisation, providing access to spin information via its decay products, make the top quark a fascinating object of many high energy physics studies, including searches for physics beyond the standard model (BSM). The aim of this study is to consider the sensitivity of t-channel single top-quark production to BSM physics, parameterised in a model-independent way via higher dimension operators in the framework of effective field theory (EFT).

At leading order three EFT operators contribute to t−channel single top-quark production. The presented study investigates the impact of these operators on differential production cross-sections. The operator O_{Φ q}⁽³⁾ modifies the magnitude of the Wtb vertex, while O_qq^(1,3) affects angular distributions of top-quark production. The operator O_tW mainly impacts the decay of top quarks.