Light bottom squark and gluino confront electroweak precision measurements

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dc.creatorCho, Gi-Chol
dc.date2002-04-30
dc.date2002-06-24
dc.date.accessioned2026-07-07T10:33:03Z
dc.date.available2026-07-07T10:33:03Z
dc.descriptionWe address the compatibility of a light sbottom (mass $2\sim 5.5 \gev$) and a light gluino (mass $12\sim 16 \gev$) with electroweak precision measurements. Such light particles have been suggested to explain the observed excess in the $b$ quark production cross section at the Tevatron. The electroweak observables may be affected by the sbottom and gluino through the SUSY-QCD corrections to the $Zbb$ vertex. We examine, in addition to the SUSY-QCD corrections, the electroweak corrections to the gauge boson propagators from the stop which are allowed to be light from the SU(2)$_L$ symmetry. We find that this scenario is strongly disfavored from electroweak precision measurements unless the heavier sbottom mass eigenstate is lighter than $180\gev$ and the left-right mixing in the stop sector is sufficiently large. This implies that one of the stops should be lighter than about $98\gev$.
dc.description4 pages, revtex, 2 figures. Reference added, version to appear in Phys.Rev.Lett
dc.identifierhttps://arxiv.org/abs/hep-ph/0204348
dc.identifierhttp://arxiv.org/abs/hep-ph/0204348
dc.identifierPhys.Rev.Lett.89:091801,2002
dc.identifierdoi:10.1103/PhysRevLett.89.091801
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178974
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLight bottom squark and gluino confront electroweak precision measurements
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