Speaker
Diego Guadagnoli
(LAPTh Annecy)
Description
New particles $\phi$ in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating b− and $\tau$−factories such as Belle II. A typical search topology involves pair-produced $\tau$s (or mesons), one of which decaying to visibles plus the $\phi$, and the other providing a tag. One crucial impediment of these searches is the limited ability to reconstruct the parents’ separate boosts. We construct a novel strategy for such searches. We find an improvement by a factor close to 3 in the branching-ratio upper limit for $\tau \to e \phi$, with respect to the currently expected limit, assuming $m_\phi \le $ 1 MeV.
Author
Diego Guadagnoli
(LAPTh Annecy)
