Phenomenological Indications of the Scale of Supersymmetry

Ellis, John R.; Olive, Keith A.; Weiglein, Georg; Heinemeyer, Sven

doi:10.1088/1126-6708/2006/05/005

Article
Report number	hep-ph/0602220 ; CERN-PH-TH-2006-028 ; DCPT-06-24 ; IPPP-06-12 ; UMN-TH-2432-06 ; FTPI-MINN-06-05 ; CERN-PH-TH-2006-028 ; DCPT-2006-24 ; IPPP-2006-12 ; UMN-TH-2432
Title	Phenomenological Indications of the Scale of Supersymmetry
Author(s)	Ellis, John R. (CERN) ; Heinemeyer, Sven (Zaragoza U.) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Weiglein, Georg (Durham U., IPPP)
Affiliation	(CERN)
Publication	2006
Imprint	23 Feb 2006
Number of pages	46
In:	JHEP 05 (2006) 005
DOI	10.1088/1126-6708/2006/05/005
Subject category	Particle Physics - Phenomenology
Abstract	Electroweak precision measurements can provide indirect information about the possible scale of supersymmetry already at the present level of accuracy. We update the present-day sensitivities of precision data using the new experimental top-quark mass, m_t = 172.7 \pm 2.9 GeV, within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which there are three independent soft supersymmetry-breaking parameters m_{1/2}, m_0 and A_0. In addition to M_W and sin^2 theta_eff, the analysis is based on (g-2)_\mu, BR(b -> s gamma) and the lightest MSSM Higgs boson mass, M_h. Assuming initially that the lightest supersymmetric particle (LSP) is a neutralino, we display the CMSSM results as functions of m_{1/2}, fixing m_0 so as to obtain the cold dark matter density allowed by WMAP and other cosmological data for specific values of A_0, tan_beta and mu > 0. For a sample value of tan_beta we analyze how the global chi^2 function would change following a possible future evolution of the experimental central value of m_t and its error. In a second step, we extend the analysis to other constrained versions of the MSSM: the NUHM in which the soft supersymmetry-breaking contributions to the Higgs masses are independent and the Higgs mixing parameter mu and the pseudoscalar Higgs mass M_A become additional free parameters compared to the CMSSM, a VCMSSM in which the bilinear soft supersymmetry breaking parameter B_0 = A_0 - m_0, and the GDM in which the LSP is the gravitino. In all scenarios we find indications for relatively light soft supersymmetry-breaking masses, offering good prospects for the LHC and the ILC, and in some cases also for the Tevatron.