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Phenomenological Studies on Supersymmetry and the Strong Force

Skands, Peter LU (2004)
Abstract
In this thesis, we first consider the phenomenology of R-parity violating supersymmetric extensions of the Standard Model. Specifically, a large number of Lepton and Baryon Number violating decays of sparticles to particles are implemented in the Pythia event generator. The augmented generator has then been used to study event properties of these models, mainly at the LHC. During these studies, the development of the so-called SuSy Les Houches Accord opened for an easier interfacing between SuSy calculational tools. A first `proof-of-concept' application of the Accord was to input SuSy spectra and decay tables calculated by the SPheno program into Pythia, for the purpose of determining whether experiments at the LHC will be sensitive to a... (More)
In this thesis, we first consider the phenomenology of R-parity violating supersymmetric extensions of the Standard Model. Specifically, a large number of Lepton and Baryon Number violating decays of sparticles to particles are implemented in the Pythia event generator. The augmented generator has then been used to study event properties of these models, mainly at the LHC. During these studies, the development of the so-called SuSy Les Houches Accord opened for an easier interfacing between SuSy calculational tools. A first `proof-of-concept' application of the Accord was to input SuSy spectra and decay tables calculated by the SPheno program into Pythia, for the purpose of determining whether experiments at the LHC will be sensitive to a connection between neutrino mixing and SuSy with bilinear Lepton Number violation.



For the case of Baryon Number violation, an extension of the Lund String Model to colour topologies involving explicit Baryon Numbers is developed, called `junction fragmentation', which enables us to trace the migration of the generated Baryon number in some detail. This model is then itself extended and applied to improve the description of the physics of beam remnants in hadron--hadron collisions, in the context of a new framework for minimum-bias and underlying events. Based on the idea of multiple perturbative parton--parton interactions in hadron collisions, a sophisticated treatment of correlations in impact parameter, flavour, momentum, and colour is introduced. The last step so far in the evolution of this model has been the development of pT-ordered initial- and final-state radiation algorithms, which among other things have enabled us to `interleave' initial-state radiation and multiple interactions into one common sequence of decreasing pT values. Nonetheless, there is still a long way to go before a clear and unique picture of hadron collisions may emerge. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Mangano, Michelangelo, CERN
organization
publishing date
type
Thesis
publication status
published
subject
keywords
R-parity violation, Physics, beam remnants, hadronisation, parton showers, underlying event, Supersymmetry, Fysik, QCD, Fysicumarkivet A:2004:Skands
pages
324 pages
publisher
Peter Skands, Hökvägen 14, 227 32 Lund.,
defense location
Hall F, Theoretical Physics,
defense date
2004-10-08 13:30
ISBN
91-628-6189-1
language
English
LU publication?
yes
id
e06e4107-a802-4232-8574-a83d988fd685 (old id 467328)
date added to LUP
2007-10-13 15:11:05
date last changed
2016-09-19 08:45:13
@misc{e06e4107-a802-4232-8574-a83d988fd685,
  abstract     = {In this thesis, we first consider the phenomenology of R-parity violating supersymmetric extensions of the Standard Model. Specifically, a large number of Lepton and Baryon Number violating decays of sparticles to particles are implemented in the Pythia event generator. The augmented generator has then been used to study event properties of these models, mainly at the LHC. During these studies, the development of the so-called SuSy Les Houches Accord opened for an easier interfacing between SuSy calculational tools. A first `proof-of-concept' application of the Accord was to input SuSy spectra and decay tables calculated by the SPheno program into Pythia, for the purpose of determining whether experiments at the LHC will be sensitive to a connection between neutrino mixing and SuSy with bilinear Lepton Number violation.<br/><br>
<br/><br>
For the case of Baryon Number violation, an extension of the Lund String Model to colour topologies involving explicit Baryon Numbers is developed, called `junction fragmentation', which enables us to trace the migration of the generated Baryon number in some detail. This model is then itself extended and applied to improve the description of the physics of beam remnants in hadron--hadron collisions, in the context of a new framework for minimum-bias and underlying events. Based on the idea of multiple perturbative parton--parton interactions in hadron collisions, a sophisticated treatment of correlations in impact parameter, flavour, momentum, and colour is introduced. The last step so far in the evolution of this model has been the development of pT-ordered initial- and final-state radiation algorithms, which among other things have enabled us to `interleave' initial-state radiation and multiple interactions into one common sequence of decreasing pT values. Nonetheless, there is still a long way to go before a clear and unique picture of hadron collisions may emerge.},
  author       = {Skands, Peter},
  isbn         = {91-628-6189-1},
  keyword      = {R-parity violation,Physics,beam remnants,hadronisation,parton showers,underlying event,Supersymmetry,Fysik,QCD,Fysicumarkivet A:2004:Skands},
  language     = {eng},
  pages        = {324},
  publisher    = {ARRAY(0x8eff4f8)},
  title        = {Phenomenological Studies on Supersymmetry and the Strong Force},
  year         = {2004},
}