Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 2: Search for new particles 1 (LHC)

T 2.7: Talk

Monday, March 4, 2024, 17:30–17:45, Geb. 20.30: 1.067

Search for excited leptons in the contact interaction and Z decay channels with CMS — •Fabian Nowotny, Kerstin Hoepfner, and Thomas Hebbeker — 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. Subsequently the excited 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.

Keywords: Excited; Lepton; Search; Compositeness