New Results for Light Gravitinos at Hadron Colliders - Tevatron Limits and LHC Perspectives

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dc.creatorKlasen, M.
dc.creatorPignol, G.
dc.date2006-10-13
dc.date2007-05-16
dc.date.accessioned2026-07-07T11:58:52Z
dc.date.available2026-07-07T11:58:52Z
dc.descriptionWe derive Feynman rules for the interactions of a single gravitino with (s)quarks and gluons/gluinos from an effective supergravity Lagrangian in non-derivative form and use them to calculate the hadroproduction cross sections and decay widths of single gravitinos. We confirm the results obtained previously with a derivative Lagrangian as well as those obtained with the non-derivative Lagrangian in the high-energy limit and elaborate on the connection between gauge independence and the presence of quartic vertices. We perform extensive numerical studies of branching ratios, total cross sections, and transverse-momentum spectra at the Tevatron and the LHC. From the latest CDF monojet cross section limit, we derive a new and robust exclusion contour in the gravitino-squark/gluino mass plane, implying that gravitinos with masses below $2\cdot10^{-5}$ to $1\cdot10^{-5}$ eV are excluded for squark/gluino-masses below 200 and 500 GeV, respectively. These limits are complementary to the one obtained by the CDF collaboration, $1.1\cdot 10^{-5}$ eV, under the assumption of infinitely heavy squarks and gluinos. For the LHC, we conclude that SUSY scenarios with light gravitinos will lead to a striking monojet signal very quickly after its startup.
dc.description30 pages, 12 figures. Tevatron limit improved and unitarity limit included. Version to be published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0610160
dc.identifierhttp://arxiv.org/abs/hep-ph/0610160
dc.identifierPhys.Rev.D75:115003,2007
dc.identifierdoi:10.1103/PhysRevD.75.115003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206372
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNew Results for Light Gravitinos at Hadron Colliders - Tevatron Limits and LHC Perspectives
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