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T: Teilchenphysik
T 402: Higgs I
T 402.8: Vortrag
Mittwoch, 12. März 2003, 15:45–16:00, FO7
Determining tanβ with Neutral and Charged Higgs Bosons at a Future e+e− Linear Collider — •André Sopczak1, Jack Gunion2, Tao Han3, and Jing Jiang4 — 1Lancaster University, UK — 2Univ. of California, Davis, CA — 3Univ. of Wisconsin, Madison, WI — 4Argonne National Laboratory, Argonne, IL
The ratio of neutral Higgs field vacuum expectation values, tanβ, is one of the most important parameters to be determined 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 √s=500 GeV and L=2000 fb−1 at a future linear collider (LC), we show that a very accurate determination of tanβ will be possible for low and high tanβ 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< mA < 200 GeV, we find that the rate for the process e+e−→ bbA→ bb bb provides a good determination of tanβ at high tanβ. In the MSSM Higgs sector, in the sample case of mA=200 GeV, we find that the rates for e+e−→ bbA+bbH→ bb bb and for e+e−→ HA→ bb bb provide a good determination of tanβ at high and low tanβ, respectively. We also show that the direct measurement of the average total widths of the h and A in e+e−→ HA→ bb bb events provides an excellent determination of tanβ at large values. In addition, the charged Higgs boson process e+e−→ H+H−→ tb t b has been studied. The sensitivity to tanβ at the LHC is briefly compared.