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Abstract
| The ratio of neutral Higgs field vacuum expectation values, tan beta , is one of the most important parameters to determine in either the minimal supersymmetric standard model (MSSM) or a general type-II two-Higgs doublet model (2HDM). Assuming an energy and integrated luminosity of square root s=500 GeV and L=2000 fb/sup -1/ at a future linear collider (LC), we show that a very accurate determination of tan beta will be possible for low and high tan beta values by measuring the production rates of Higgs bosons and reconstructing Higgs boson decays. In particular, based on a TESLA simulation, and assuming no other light Higgs bosons and 100<or=m/sub A/<or=200 GeV, we find that the rate for the process e/sup +/e/sup -/ to bbA to bbbb provides a good determination of tan beta at high tan beta . In the MSSM Higgs sector, in the sample case of m/sub A/=200 GeV, we find that the rates for e/sup +/e/sup -/ to bbA+bbH to bbbb and for e/sup +/e/sup -/ to HA to bbbb provide a good determination of tan beta at high and low tan beta , respectively. We also show that the direct measurement of the average total widths of the H and A in e/sup +/e /sup -/ to HA to bbbb events provides an excellent determination of tan beta at large values. In addition, the charged Higgs boson process e/sup +/e/sup -/ to H/sup +/H/sup -/ to tbtb has been studied. The sensitivity to tan beta at the LHC obtained directly from heavy Higgs boson production is briefly compared to the LC results. (64 refs). |