The Effective Weak Mixing Angle in the MSSM

Details The Effective Weak Mixing Angle in the MSSM The Effective Weak Mixing Angle in the MSSM

1998-01-28

arxiv.org/abs/hep-ph/9801425v3

Phys.Rev. D59 (1999) 015019

Physics

High Energy Physics

High Energy Physics - Phenomenology

36 pages, 9 figures, references added

Scientific paper

10.1103/PhysRevD.59.015019

The predictions of the MSSM are discussed in the light of recent LEP and SLD precision data. The full supersymmetric one loop corrections to the effective weak mixing angle, experimentally determined in LEP and SLD experiments, are considered. It is demonstrated, both analytically and numerically, that, potentially dangerous, large logarithmic sparticle corrections are cancelled. The relative difference factor \Delta k between the mixing angle defined as a ratio of couplings and the experimentally obtained angle is discussed. It is found that \Delta k is dominated by the oblique corrections, while the non-oblique overall supersymmetric EW and SQCD corrections are negligible. The comparison of the MSSM with radiative electroweak symmetry breaking to the LEP+SLD precision data indicates that rather large values of the soft breaking parameter M_{1/2} in the region greater than 500 GeV are preferred.

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