SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Searches III

T 79.3: Talk

Wednesday, March 22, 2023, 18:00–18:15, HSZ/0403

Search for excited leptons in the contact interaction and Z decay channels with CMS — •Fabian Nowotny, Thomas Hebbeker, and Kerstin Hoepfner — III. Physikalisches Institut A, RWTH Aachen University

The Standard Model of particle physics does not provide a comprehensive explanation for the observed hierarchy of three generations of fermions, for both leptons and quarks. A possible explanation is delivered by models postulating that quarks and leptons themselves are composite objects. Their constituents are bound by an asymptotically free gauge interaction below a characteristic scale Λ. Such models of compositeness predict the existence of excited lepton (l^⋆) and excited quark (q^⋆) states at the characteristic scale Λ of the new binding interaction. The theory allows the production of excited leptons via contact interactions in conjunction with a Standard Model lepton. Furthermore, the leptons can decay into several final states.
This talk focuses on the contact interaction and Z-boson decay channels, both resulting in l^⋆→ l q q transitions where l represents e and µ. Preliminary results are presented on the Run 2 proton-proton dataset of CMS corresponding to a luminosity of 137.6 fb⁻¹ at a center of mass energy of √s = 13 TeV.