Eur. Phys. J. C (2006) 46: 783-789
https://doi.org/10.1140/epjc/s2006-02528-4

Theoretical Physics

Test of lepton flavour violation at the LHC

¹ Institut für Theoretische Physik, Universität Wien, 1090, Vienna, Austria
² Department of Physics, Tokyo Gakugei University, Koganei, Tokyo, 184-8501, Japan
³ Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, 1050, Vienna, Austria
⁴ Instituto de Física Corpuscular/C.S.I.C. , Universitat de Valencia,, Edificio Institutos de Paterna, Apartado de Correos 22085, 46071, Valencia, Spain
⁵ Institut für Theoretische Physik, Universität Zürich, 8057, Zürich, Switzerland

^* e-mail: tkern@hephy.oeaw.ac.at

Received: 28 November 2005
Revised: 13 February 2006
Published online: 12 April 2006

Abstract

We study lepton flavour violating decays of neutralinos and sleptons within the minimal supersymmetric standard model, assuming two and three generation mixings in the slepton sector. We take into account the most recent bounds on flavour violating rare lepton decays. Taking the SPS1a’ scenario as an example, we show that some of the lepton flavour violating branching ratios of neutralinos and sleptons can be sizable (∼5–10%). We study the impact of the lepton flavour violating neutralino and slepton decays on the di-lepton mass distributions measured at the LHC. We find that they can result in novel and characteristic edge structures in the distributions. In particular, double-edge structures can appear in the eτ and μτ mass spectra if is the lightest slepton. The appearance of these remarkable structures provides a powerful test of supersymmetric lepton flavour violation at the LHC.