CERN Accelerating science

Preprint
Report number	hep-ph/0604180 ; CERN-PH-TH-2006-068 ; DCPT-2006-48 ; FTPI-MINN-2006-12 ; IPPP-2006-24
Title	Indications of the CMSSM Mass Scale from Precision Electroweak Data
Author(s)	Ellis, Jonathan Richard ; Heinemeyer, S ; Olive, Keith A ; Weiglein, Georg
Affiliation	(CERN)
Publication	2006
Imprint	21 Apr 2006
Number of pages	16
Presented at	2nd International Linear Collider Physics and Detector Workshop and 2nd ILC Accelerator Workshop, Snowmass, CO, USA, 14 - 27 Aug 2005
Subject category	Particle Physics - Phenomenology
Abstract	We discuss the sensitivities of present-day electroweak precision data to the possible scale of supersymmetry within the constrained minimal supersymmetric extension of the Standard Model (CMSSM). Our analysis is based on M_W, sin^2 theta_eff, (g-2)_mu, BR(b -> s gamma), and the lightest MSSM Higgs boson mass, M_h. We display the impact of the recent reduction in m_t from 178.0 +- 4.3 GeV to 172.7 +- 2.9 GeV on the interpretation of the precision observables. We show the currently preferred values of the CMSSM mass scale m_{1/2} based on a global chi^2 fit, assuming that the lightest supersymmetric particle (LSP) is a neutralino, and 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. The recent reduction in m_t reinforces previous 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. Finally, we discuss the sensitivity of the global chi^2 function to possible future evolution in the experimental central value of m_t and its error.
Other source	Inspire