5,190 research outputs found
Revisit to Non-decoupling MSSM
Dipole operator requires the helicity
flip in the involving quark states thus the breaking of chiral . On the other hand, the -quark mass generation is also a
consequence of chiral symmetry breaking. Therefore,
in many models, there might be strong correlation between the
and quark Yukawa coupling. We use non-decoupling MSSM model to illustrate
this feature. The light Higgs boson may evade the direct search experiments at
LEPII or Tevatron while the 125 GeV Higgs-like boson is identified as the heavy
Higgs boson in the spectrum. A light charged Higgs is close to the heavy Higgs
boson which is of 125 GeV and its contribution to requires
large supersymmetric correction with large PQ and symmetry breaking. The
large supersymmetric contribution at the same time significantly modifies the
quark Yukawa co upling. With combined flavor constraints
and and direct constraints on Higgs properties, we
find best fit scenarios with light stop of (500 GeV), negative
around -750 GeV and large -term of 2-3 TeV. In addition, reduction in
partial width may also result in large enhancement of
decay branching fraction. Large parameter region in the survival space under
all bounds may be further constrained by if no excess of
is confirmed at LHC. We only identify a small parameter region with
significant decay that is consistent with all bounds and reduced
decay branching fraction.Comment: 18pages, 6 figure
Like-sign Di-lepton Signals in Higgsless Models at the LHC
We study the potential LHC discovery of the Z1 KK gauge boson unitarizing
longitudinal W+W- scattering amplitude. In particular, we explore the decay
mode Z1->t tbar along with Z1-> W+W- without specifying the branching
fractions. We propose to exploit the associated production pp-> W Z1, and
select the final state of like-sign dileptons plus multijets and large missing
energy. We conclude that it is possible to observe the Z1 resonance at a 5
sigma level with an integrated luminosity of 100 inverse fb at the LHC upto 650
GeV for a dominant WW channel, and 560 GeV for a dominant ttbar channel.Comment: 13 pages, 7 figure
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