Technicolor and new matter generations
Julkaistu sarjassa
Research report / Department of Physics, University of JyväskyläTekijät
Päivämäärä
2010Oppiaine
FysiikkaThis work consists of an overview part and three research papers. The subject of
this work is a class of models for dynamical electroweak symmetry breaking, and
new generations of fermionic matter. An introductory overview of the standard
model of electroweak interactions is given, as well as an overview of some of the
recent developments in the field of walking technicolor models.
We study some recently proposed models for dynamical electroweak symmetry
breaking, namely the minimal walking technicolor (MWT) and next to
minimal walking technicolor (NMWT) model. We show that, as a result of cancellation
of the global and gauge anomalies associated with the technicolor sector,
a non sequential SM-like matter generation may naturally arise. We study
the effects of this new matter generation on electroweak and flavor observables
and derive constraints for the masses of the new fermions. We show that the new
fermions may have a significant impact on the physics of the composite Higgs
boson of the technicolor theory. We present the resulting decay branching ratios
and production cross sections of the composite Higgs boson. We also find that
the fermions themselves should be visible in the LHC experiment, and outline
basic search strategies.
We construct a model framework for the origin of fermion masses, in which a
technicolor sector is accompanied by a scalar boson. In this bottom-up-approach
the scalar represents the low energy spectrum of the yet unkown full gauge theory
responsible for fermion masses. We construct a low energy effective Lagrangian
and use electroweak and flavor precision observables, as well as direct detection
limits, to constrain the parameters of the model. We find that the low energy
particle spectrum of the model consists of one light and one heavy Higgs-like
scalar, accompanied by three massive technipions.
We find that all of the models studied in this work are viable in the light of
all existing electroweak and flavor precision data. The LHC experiment will be
able to give crucial information on the subject, and possibly confirm or rule out
some of the models studied in this work.
...
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Julkaisija
University of JyväskyläISBN
978-951-39-4052-2ISSN Hae Julkaisufoorumista
0075-465XJulkaisuun sisältyy osajulkaisuja
- Artikkeli I: Antipin, O., Heikinheimo, M., & Tuominen, K. (2009). Natural fourth generation of leptons. JHEP, (0910), 018. DOI: 10.1088/1126-6708/2009/10/018
- Artikkeli II: Antola, M., Heikinheimo, M., Sannino, F., & Tuominen, K. (2010). Unnatural Origin of Fermion Masses for Technicolor. Journal of High Energy Physics, 1003, 50. DOI: 10.1007/jhep03(2010)050
- Artikkeli III: Antipin, O., Heikinheimo, M., & Tuominen, K. (2010). The Next Generation. Journal of High Energy Physics, 1007, 52. DOI: 10.1007/JHEP07(2010)052
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