The littlest Higgs model is one of the most economical solution to
the hierarchy problem of the standard model. It predicts existence
of new gauge vectors and also new scalars, neutral and charged.
The littlest Higgs model predicts the existence of new scalars
beside a scalar that can be assigned as Higgs scalar of the standard
model. In this thesis, the production of scalars in $e^+e^-$
colliders is studied. The scalar productions associated with
standard model Higgs boson are also analyzed. The effects of the
parameters of the littlest Higgs model to these processes are
examined in detail.
The collider phenomenology of the littlest Higgs model is strongly
dependant on the free parameters of the model, which are the mixing
angles $s,s' / $ and the symmetry breaking scale $f$. The parameters of
the model are strongly restricted when the fermions are charged
under only one $U(1)$ subgroup. In this thesis, by charging fermions
under two $U(1)$ subgroups, the constraints on the symmetry braking
scale and the mixing angles are relaxed.
In the littlest Higgs model, the existence of charged heavy scalars
also displays an interesting feature. By writing a Majorano like
term in the Yukawa Lagrangian, these heavy charged scalars are
allowed to decay in to lepton pairs, violating lepton number and
flavor. In this thesis, the leptonic final states and also the
lepton flavor and number violating final signals are also analyzed.
As a result of these thesis, it is predicted that the scalar
production will be in the reach for a $sqrt{S}=2TeV$ $e^+ e^-$
collider, giving significant number of lepton flavor violating
signals depending on the Yukawa couplings of the flavor violating
term.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12611393/index.pdf |
| Date | 01 December 2009 |
| Creators | Cagil, Ayse |
| Contributors | Zeyrek, Mehmet Tevfik |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | Ph.D. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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