Kavli Affiliate: Jia Liu
| First 5 Authors: Qing-Hong Cao, Jinhui Guo, Jia Liu, Yan Luo, Xiao-Ping Wang
| Summary:
Recently, the vector-like leptons (VLLs) as a simple extension to the
standard model (SM) have attracted widespread attention both in theory and
experiments. The present collider searches mainly focus on the studies of their
prompt decays, which prefer a relatively large coupling. In this paper, we
concentrate on searches for long-lived signatures of the singlet VLLs $F$ or
their accompanying scalar particles $phi$ both in the hadronic and electronic
colliders. The long-lived signatures are naturally induced from small chiral
mass mixing between VLLs and SM leptons. Two specific models distinguished by
whether the VLLs couple to scalar particles are introduced to realize the
aforementioned features. For long-lived VLLs case, we find that with the kink
track method the sensitivities at future HL-LHC with $sqrt{s}=14~text{TeV}$
can reach the regions for VLL mass $m_F in [200,1100]~text{GeV}$ and the mass
mixing parameter $theta_L in [10^{-10},3times 10^{-8}]$. For the long-lived
accompanying scalar particle case, by fixing VLLs or scalar mass, or the mass
ratio between VLL and the accompanying scalar, we explore the projected
sensitivities through the time delay and displaced vertex strategies, which can
probe the regions for $m_F in [200,1200]~text{GeV}$ and coupling
$ytheta_Lin [10^{-11},10^{-6}]$. Furthermore, we also explore the long-lived
accompanying scalars at the future CEPC provided that the VLLs can couple to
the SM first-generation leptons. We find that CEPC has good performances for
$m_phi < 120~text{GeV}$ and $m_F<1200~text{GeV}$. These long-lived searches
are complementary to previous studies, which opens the door towards the smaller
coupling regions.
| Search Query: ArXiv Query: search_query=au:”Jia Liu”&id_list=&start=0&max_results=3