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Searches for New Physics in Single Photon Events and a Search for Charginos at the DELPHI Experiment

Ask, Stefan LU (2004)
Abstract (Swedish)
Popular Abstract in Swedish

Den teoretiska beskrivningen av materians minsta beståndsdelar, den så kallade standardmodellen (SM), överenstämmer med oerhörd noggrannhet med de många och avancerade partikelfysik-experiment som utförts världen över. Trots denna överenstämmelse finns problematiska aspekter hos SM som gör att den inte kommer kunna beskriva fysikaliska fenomen vid högre energier, som ännu inte kunnat utforskas experimentellt. För en problemfri teoretisk modell krävs att ytterligare partiklar, utöver de tillhörande SM, existerar och de skulle i så fall ge upphov till nya fenomen som endast kan observeras i experiment vid dagens kraftfullaste partikel-acceleratorer. Denna avhandling beskriver sökandet efter dessa... (More)
Popular Abstract in Swedish

Den teoretiska beskrivningen av materians minsta beståndsdelar, den så kallade standardmodellen (SM), överenstämmer med oerhörd noggrannhet med de många och avancerade partikelfysik-experiment som utförts världen över. Trots denna överenstämmelse finns problematiska aspekter hos SM som gör att den inte kommer kunna beskriva fysikaliska fenomen vid högre energier, som ännu inte kunnat utforskas experimentellt. För en problemfri teoretisk modell krävs att ytterligare partiklar, utöver de tillhörande SM, existerar och de skulle i så fall ge upphov till nya fenomen som endast kan observeras i experiment vid dagens kraftfullaste partikel-acceleratorer. Denna avhandling beskriver sökandet efter dessa nya partiklar inom två olika analyser vid DELPHI experimentet på CERN, enfoton-analysen och chargino-analysen. DELPHI var ett av de bäst lämpade experimenten för denna typ av studier och inom de två analyserna letades efter fenomen från supersymmetriska partiklar, extra dimensioner samt nya neutrino-växelverkningar. Inga tecken på nya fenomen observerades och resultaten användes därför till att begränsa möjligheterna för de utvidgade modellerna av SM. Detta ger viktig information om vad som fortfarande kan vara en korrekt beskrivning av universum på partikelnivå och om vilka vägar som är de mest relevanta för det fortsatta sökandet. (Less)
Abstract
A search for new physics using events with a single photon and missing energy has been made at the DELPHI experiment together with a search for charginos. The results were based on data collected up to and including the final year of 2000. An integrated luminosity of 650 pb^-1 was used in the single photon analysis and 450 pb^-1 in the chargino search. Center-of-mass energies up to 209 GeV were explored. Searches have been made for supersymmetry as well as for extra dimensions and non standard neutrino interactions. Since no signs of a signal have been observed in any of the searches the results have been used to set exclusion limits and to constrain the theoretical parameter spaces. The search results using single and acoplanar photon... (More)
A search for new physics using events with a single photon and missing energy has been made at the DELPHI experiment together with a search for charginos. The results were based on data collected up to and including the final year of 2000. An integrated luminosity of 650 pb^-1 was used in the single photon analysis and 450 pb^-1 in the chargino search. Center-of-mass energies up to 209 GeV were explored. Searches have been made for supersymmetry as well as for extra dimensions and non standard neutrino interactions. Since no signs of a signal have been observed in any of the searches the results have been used to set exclusion limits and to constrain the theoretical parameter spaces. The search results using single and acoplanar photon events from the four LEP experiments have also been combined within the searches for supersymmetry and extra dimensions. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Ass. Prof McPherson, Rob
organization
publishing date
type
Thesis
publication status
published
subject
keywords
quantum field theory, DELPHI, single photon events, LEP, chargino search, supersymmetry, extra dimensions, Elementary particle physics, non standard neutino interactions., Elementarpartikelfysik, kvantfältteori, Fysicumarkivet A:2004:Ask
pages
208 pages
publisher
Experimental High-Energy Physics
defense location
Lecture hall B
defense date
2004-12-10 14:15
ISBN
91-628-6321-5
language
English
LU publication?
yes
id
acee1961-3a42-4698-b28a-5fbb1331c43f (old id 21743)
date added to LUP
2007-05-28 09:10:18
date last changed
2016-09-19 08:45:09
@phdthesis{acee1961-3a42-4698-b28a-5fbb1331c43f,
  abstract     = {A search for new physics using events with a single photon and missing energy has been made at the DELPHI experiment together with a search for charginos. The results were based on data collected up to and including the final year of 2000. An integrated luminosity of 650 pb^-1 was used in the single photon analysis and 450 pb^-1 in the chargino search. Center-of-mass energies up to 209 GeV were explored. Searches have been made for supersymmetry as well as for extra dimensions and non standard neutrino interactions. Since no signs of a signal have been observed in any of the searches the results have been used to set exclusion limits and to constrain the theoretical parameter spaces. The search results using single and acoplanar photon events from the four LEP experiments have also been combined within the searches for supersymmetry and extra dimensions.},
  author       = {Ask, Stefan},
  isbn         = {91-628-6321-5},
  keyword      = {quantum field theory,DELPHI,single photon events,LEP,chargino search,supersymmetry,extra dimensions,Elementary particle physics,non standard neutino interactions.,Elementarpartikelfysik,kvantfältteori,Fysicumarkivet A:2004:Ask},
  language     = {eng},
  pages        = {208},
  publisher    = {Experimental High-Energy Physics},
  school       = {Lund University},
  title        = {Searches for New Physics in Single Photon Events and a Search for Charginos at the DELPHI Experiment},
  year         = {2004},
}