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T: Fachverband Teilchenphysik

T 37: Search for New Particles 2

T 37.2: Talk

Tuesday, March 22, 2022, 16:30–16:45, T-H22

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

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 2018 proton-proton dataset corresponding to a luminosity of 59.8 fb⁻¹ at a center of mass energy of √s = 13 TeV.