The fine-tuning price of LEP

Details The fine-tuning price of LEP The fine-tuning price of LEP

1997-12-02

arxiv.org/abs/hep-ph/9712234v2

Phys.Lett.B423:327-336,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures. Two references added, one corrected. A typo corrected

Scientific paper

10.1016/S0370-2693(98)00060-4

We quantify the amount of fine tuning of input parameters of the Minimal Supersymmetric Extension of the Standard Model (MSSM) that is needed to respect the lower limits on sparticle and Higgs masses imposed by precision electroweak measurements at LEP, measurements of $b\to X_s\gamma$, and searches at LEP 2. If universal input scalar masses are assumed in a gravity-mediated scenario, a factor of $\gappeq180$ is required at $\tan\beta\sim1.65$, decreasing to $\sim20$ at $\tan\beta\sim10$. The amount of fine tuning is not greatly reduced if non-universal input scalar Higgs masses are allowed, but may be significantly reduced if some theoretical relations between MSSM parameters are assumed.

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