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Recherche des squarks quasi dégénérés avec la LSP dans l'expérience DELPHI au LEP

Abstract : The present work deals with the search of third generation squarks in the framework of the MSSM with R-parity conservation, for small mass differences between these squarks and the LSP. Data collected at centre-of-mass energies front 189 to 209 GeV by DELPHI detector, corresponding to an integrated luminosity of 608 pb-1, are analysed in a search for three topologies.
No evidence for deviations from the, Standard Model expectation is found. For a short lifetime stop a lower limit of 71 GeV/c2 is set for the, mass, independent of the mixing angle. Long-lived stop and sbottom of 97 GeV/c2 and 89 GeV/c2, respectivcly, arc also excluded. For Delta m > 5 GeV/c2 an intermediate lifetime stop with m < 52 GeV/c2 is excluded for all mixing angles; for Delta m > 2 GeV/c2, the, limit is set to 54 GeV/c2 for a loft-handed stop only.
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https://tel.archives-ouvertes.fr/tel-00005441
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Submitted on : Tuesday, March 23, 2004 - 2:55:40 PM
Last modification on : Friday, May 29, 2020 - 4:00:26 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 2:15:31 PM

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  • HAL Id : tel-00005441, version 1

Citation

Jalal Abdallah. Recherche des squarks quasi dégénérés avec la LSP dans l'expérience DELPHI au LEP. Physique des Hautes Energies - Expérience [hep-ex]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00005441⟩

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