Global fits of the SM and MSSM to electroweak precision data View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1997-12

AUTHORS

W. de Boer, A. Dabelstein, W. Hollik, W. Mösle, U. Schwickerath

ABSTRACT

A program including all radiative corrections to the Minimal Supersymmetric Standard Model (MSSM) at the same level as the radiative corrections to the Standard Model (SM) has been developed and used to perform global fits to all electroweak data from LEP, SLC and the Tevatron and the radiative b → sγ decay from CLEO. Values of the strong coupling constant at the MZ scale and sin2θMS are derived, both in the SM and MSSM.Recent updates on electroweak data, which have been presented at the Warsaw Conference in summer 1996, reduce the too high branching ratio of the Z0 boson into b-quarks in the SM from a 3.2σ to a 1.8σ effect. In addition, the b → sγ decay is 30% below the SM prediction. In the MSSM light stops and light charginos increase Rb and decrease the b → sγ rate, so both observations can be brought into agreement with the MSSM for the same region of parameter space. However, the resulting χ2 value for the MSSM fits is only marginally lower and in addition, the splitting in the stop sector has to be unnaturally high. More... »

PAGES

627-640

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s002880050508

DOI

http://dx.doi.org/10.1007/s002880050508

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1010469398


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