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Abstract: The Dine-Seiberg-Thomas model DSTM is the simplest version of the newphysics beyond the minimal supersymmetric standard model MSSM, in the sensethat its Higgs sector has just two dimension-five operators, which are obtainedfrom the power series of the energy scale for the new physics in the effectiveaction analysis. We study the possibility of spontaneous CP violation in theHiggs sector of the DSTM, which consists of two Higgs doublets. We find thatthe CP violation may be triggered spontaneously by a complex phase, obtained asthe relative phase between the vacuum expectation values of the two Higgsdoublets. At the tree level, for a reasonably established parameter region, themasses of the three neutral Higgs bosons and their corresponding couplingcoefficients to a pair of $Z$ bosons in the DSTM are calculated such that theresults are inconsistent with the experimental constraint by the LEP data.Thus, the LEP2 data exclude the possibility of spontaneous CP violation in theDSTM at the tree level. On the other hand, we find that, for a wide area in theparameter region, the CP symmetry may be broken spontaneously in the Higgssector of the DSTM at the one-loop level, where top quark and scalar top quarkloops are taken into account. The upper bound on the radiatively corrected massof the lightest neutral Higgs boson of the DSTM is about 87 GeV, in thespontaneous CP violation scenario. We confirm that the LEP data does notexclude this numerical result.



Author: S. W. Ham, Seong-a Shim, S. K. OH

Source: https://arxiv.org/







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