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S1A-13 其他数据使用手册 - Diodes（美台）
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arXiv:1311.7260v2 [hep-ph] 21 May 2014
IFT-UAM/CSIC-13-126
FTUAM 13/36
HGU-CAP-027
November 27, 2013
Displaced vertices and long-lived charged particles in the
NMSSM with right-handed sneutrinos
David G. Cerde˜no
1,2,∗
, V´ıctor Mart´ın-Lozano
1,2,†
, Osamu Seto
3,‡
1
Instituto de F´ısica Te´orica UAM/CSIC, Universidad Aut´onoma de Madrid,
Cantoblanco, E-28049, Madrid, Spain
2
Departamento de F´ısica Te´orica, Universidad Aut´onoma de Madrid, Cantoblanco, E-28049,
Madrid, Spain
3
Department of Life Science and Technology, Hokkai-Gakuen University,
Asahimachi, 062-8605, Sapporo, Japan
Abstract
We study LHC signatures of displaced vertices a nd long-lived charged particles within
the context of the Next-to-Minimal Supersymmetric Standard Model with right-handed
(RH) sneutrinos. In this construction the RH neutrino can be produced directly from
Higgs decays or in association with a RH sneutrino when the latter is the lightest su-
persymmetric particle. The RH neutrino is generally long-lived, since its decay width is
proportional to the neutrino Yukawa, a parameter which is predicted to be small. The
RH neutrino late decay can therefore give rise to displaced vertices at the LHC, which
can be identified through the decay products, which involve two leptons (2ℓ + /E
T
) or a
lepton with two jets (ℓjj). We simulate this signal for the current LHC configuration (a
centre of mass of 8 TeV and an integrated luminosity of L = 20 fb
−1
), and a future one
(13 Te V and L = 100 fb
−1
). We show that a region of the parameter space of this model
can be probed and that the RH neutrino mass can be reconstructed from the end-point
of the two-lepton invariant mass distribution or the central value of the mas s distribution
for two jets plus one lepton. Another exotic signature of this cons truction is the produc-
tion of a long-lived sta u. If the stau is the next-to-lightest supersymmetric particle, it
can decay through diagrams involving the small neutrino Yukawa, and would escape the
detector leaving a characteristic trail. We also simulate this signal for various benchmark
points and show that the model can be within the reach of the future run of the LHC.
∗
davidg.cerden o@uam.es
†
victor.martinlozano@uam.es
‡
seto@physics.umn.edu
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