Can I read Lepton pair emission in the top quark decay $t \to bW^+\ell^-\ell^+$ on EtoBox?

Lepton pair emission in the top quark decay $t \to bW^+\ell^-\ell^+$ by Quintero, Nestor; Diaz-Cruz, J. Lorenzo; Castro, Gabriel Lopez is a scholarly article available to read on EtoBox.

What is Lepton pair emission in the top quark decay $t \to bW^+\ell^-\ell^+$ about?

The heaviness of the top quark makes its 2-body decay mode $t \to bW^+$ to be dominant, at such level that hardly any other decay mode reaches a detectable branching ratio (BR) within the SM. Here we study the decay $t \to bW^+\ell^-\ell^+$ ($\ell=e, \mu, \tau$), which diverges for massless leptons, and it can reach a BR $\sim \mathcal{O}(10^{-5}\sim 10^{-6})$ for reasonable values of the low energy cut in the lepton-pair invariant mass. This rate surpasses almost any other rare decays such as $t \to cX$ ($X=\gamma,Z,g,H, W^+W^-$), and thus offers the possibility of being detectable. Furthermore, the estimate of this channel is relevant because it can mimic the signal arising from the lepton number violating decay $t\to bW^-\ell^+\ell^+$, when the $W$ boson decays into lepton channels.

Author

Quintero, Nestor; Diaz-Cruz, J. Lorenzo; Castro, Gabriel Lopez

Published

2014

Language

EN