Resurrecting no-scale supergravity phenomenology

John Ellis, Azar Mustafayev, Keith A. Olive

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


In the context of phenomenological models in which the soft supersymmetry-breaking parameters of the MSSM become universal at some unification scale, Min, above the GUT scale, MGUT, it is possible that all the scalar mass parameters m0, the trilinear couplings A0 and the bilinear Higgs coupling B0 vanish simultaneously, as in no-scale supergravity. Using these no-scale inputs in a renormalisation-group analysis of the minimal supersymmetric SU(5) GUT model, we pay careful attention to the matching of parameters at the GUT scale. We delineate the region of Min, m1/2 and tan β where the resurrection of no-scale supergravity is possible, taking due account of the relevant phenomenological constraints such as electroweak symmetry breaking, mh,b→sγ, the neutralino cold dark matter density Ωχh2 and gμ-2. No-scale supergravity survives in an L-shaped strip of parameter space, with one side having m1/2≳200 GeV, the second (orthogonal) side having Min≳5×1016 GeV. Depending on the relative signs and magnitudes of the GUT superpotential couplings, these may be connected to form a triangle whose third side is a hypotenuse at larger Min, m1/2 and tan β, whose presence and location depend on the GUT superpotential parameters. We compare the prospects for detecting sparticles at the LHC in no-scale supergravity with those in the CMSSM and the NUHM.

Original languageEnglish (US)
Pages (from-to)219-233
Number of pages15
JournalEuropean Physical Journal C
Issue number1
StatePublished - 2010


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