Naturally Large Tan $β$

Details Naturally Large Tan $β$ Naturally Large Tan $β$

1993-08-15

arxiv.org/abs/hep-ph/9308277v1

Phys.Lett.B316:516-520,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages (uses harvmac), UCSD/PTH 93-24, MIT-CTP-2230

Scientific paper

10.1016/0370-2693(93)91037-N

We show that if there are only two Higgs doublets in the supersymmetric standard model, large $\tan\beta$ requires a fine tuning in the parameters of the Lagrangian of order ($1/\tan\beta$), which cannot be explained by any approximate symmetry. With an extended Higgs sector, large $\tan\beta$ can be natural. We give an explicit example with four doublets in which it is possible to achieve large $\tan\beta$ as a result of an approximate symmetry, without any light superpartners. The approximate symmetry can be extended to explain all the hierarchies in the quark mass matrix.

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