Indication for Light Sneutrinos and Gauginos from Precision Electroweak Data

Details Indication for Light Sneutrinos and Gauginos from Precision Electroweak Data Indication for Light Sneutrinos and Gauginos from Precision Electroweak Data

2001-06-04

arxiv.org/abs/hep-ph/0106029v1

JHEP 0106:018,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages LaTex, 9 figures, uses epsfig

Scientific paper

10.1088/1126-6708/2001/06/018

The present Standard Model fit of precision data has a low confidence level, and is characterized by a few inconsistencies. We look for supersymmetric effects that could improve the agreement among the electroweak precision measurements and with the direct lower bound on the Higgs mass. We find that this is the case particularly if the 3.6 sigma discrepancy between sin^2 theta_eff from leptonic and hadronic asymmetries is finally settled more on the side of the leptonic ones. After the inclusion of all experimental constraints, our analysis selects light sneutrinos, with masses in the range 55-80 GeV, and charged sleptons with masses just above their experimental limit, possibly with additional effects from light gauginos. The phenomenological implications of this scenario are discussed.

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