Decays of the lightest top squark

C. Boehm (1) , A. Djouadi (2) , Y. Mambrini (2)

1 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique
2 PMT - Laboratoire de Physique Mathématique et Théorique

We analyze higher order decay modes of the lightest top squark $\tilde{t}_1$ in the Minimal Supersymmetric extension of the Standard Model (MSSM), where the lightest SUSY particle (LSP) is assumed to be the neutralino $\chi_1^0$. For small $\tilde{t}_1$ masses accessible at LEP2 and the Tevatron, we show that the four-body decay mode into the LSP, a bottom quark and two massless fermions, $\tilde{t}_1 \ra b \chi_1^0 f\bar{f}'$, can dominate in a wide range of the MSSM parameter space over the loop-induced decay into a charm quark and the LSP, $\tilde{t}_1 \ra c \chi_1^0$. This result might affect the experimental searches on this particle, since only the later signal has been considered so far.

Domaines: Physique [physics]; Physique des Hautes Energies - Phénoménologie [hep-ph]

C. Boehm, A. Djouadi, Y. Mambrini. Decays of the lightest top squark. Physical Review D, 2000, 61 (9), ⟨10.1103/PhysRevD.61.095006⟩. ⟨hal-02105263⟩