Orateur
M.
Hayato Ito
(U.Tokyo)
Description
Motivated by new metastable massive particles in a variety of
extensions of the Standard Model (SM), I propose a new analysis
based on Displaced Vertices (DVs) at the LHC. I show that, if
metastable particles are pair-produced, two decay vertices can be
distinguished with the performance of the LHC detectors if they are
separated by $ \ge 100~\mu{\rm m}$. I discuss that the detailed
study of the sub-millimeter DVs may greatly improve the discovery
reach for metastable particles with $100~{\rm \mu m} \le c\tau
\le 10$ mm, which have been regarded as promptly-decaying in
previous analysis. It is also possible to measure the decay length
of such particles, which provides important information to
understand the nature of the new physics. As an illustration, I
apply our method to the metastable gluino searches at the future LHC
experiments. I find that the expected reach for the gluino mass
can be extended by about $300$ GeV for $c\tau_{\tilde{g}} \sim
1$ mm. I also find a gluino with $c\tau_{\tilde{g}} \ge
200~{\rm \mu m}$ can be distinguished from a promptly-decaying one
at a 5-$\sigma$ confidence level in the case a gluino with the mass
of 2 TeV exists.
Author
M.
Hayato Ito
(U.Tokyo)
