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

Abstract

We 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 $2\cdot 10^{-5}$ to $1\cdot 10^{-5}$ 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.

arXiv comment30 pages, 12 figures. Tevatron limit improved and unitarity limit included. Version to be published in Phys. Rev. D

References in corpus (30)

• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Theories with Gauge-Mediated Supersymmetry Breaking
• Constraining Warm Dark Matter candidates including sterile neutrinos and light gravitinos with WMAP and the Lyman-alpha forest
• SuSpect: a Fortran Code for the Supersymmetric and Higgs Particle Spectrum in the MSSM
• The Snowmass Points and Slopes: Benchmarks for SUSY Searches
• Thermal Production of Gravitinos
• Squark and Gluino Production at Hadron Colliders
• The Implementation of the Minimal Supersymmetric Standard Model in FeynArts and FormCalc
• SDECAY: a Fortran code for the decays of the supersymmetric particles in the MSSM
• Search for supersymmetry with a light gravitino at the Fermilab Tevatron and CERN LEP colliders
• Effects of the Gravitino on the Inflationary Universe
• Signals of a superlight gravitino at hadron colliders when the other superparticles are heavy
• Signals of a superlight gravitino at e^+ e^- colliders when the other superparticles are heavy
• On the effective interactions of a light gravitino with matter fermions
• Search for Large Extra Dimensions in the Monojet + Missing ET Channel at D0
• Goldstino Couplings to Matter
• Search for Large Extra Dimensions in the Production of Jets and Missing Transverse Energy in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV
• Aspects of spontaneously broken N = 1 global supersymmetry in the presence of gauge interactions
• On the Interactions of Light Gravitinos
• Single-photon signals at LEP in supersymmetric models with a light gravitino
• Goldstino Decoupling in Spontaneously Broken Supergravity Theories
• Effective Lagrangians and Light Gravitino Phenomenology
• New Collider Bound on Light Gravitino Mass
• Interactions of a Single Goldstino
• On the muon anomalous magnetic moment in models with a superlight gravitino
• Light-Gravitino Production at Hadron Colliders
• Limits on Gravitino Production and New Processes with Large Missing Transverse Energy in p-pbar Collisions at sqrt(s)=1.8 TeV
• Nonlinear Supersymmetric Effective Lagrangian and Goldstino Interactions at High Energies

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• Light Gravitinos at Colliders and Implications for Cosmology
• Flavour Violation in Gauge-Mediated Supersymmetry Breaking Models: Experimental Constraints and Phenomenology at the LHC
• The $F$-term Problem and other Challenges of Stringy Quintessence
• SUSY dark matter(s)
• Supersymmetric Monojets at the Large Hadron Collider
• Signals of a superlight gravitino at the LHC
• HELAS and MadGraph with goldstinos
• Soft gluon resummation for associated gluino-gaugino production at the LHC
• Multi-photon signal in supersymmetry comprising non-pointing photon(s) at the LHC
• Associated production of light gravitinos in e^+e^- and e^-γcollisions
• Closing in on compressed gluino-neutralino spectra at the LHC