TY - JOUR

T1 - Higgs sector in a U(1)′ extension of the minimal supersymmetric standard model

AU - Han, Tao

AU - Langacker, Paul

AU - McElrath, Bob

N1 - Funding Information:
We thank V. Barger, J. Erler, J. Gunion, T. Li, and J. Wells, for useful discussions. This work was supported in part by DOE Grants No. DE-FG02-95ER-40896, No. DE-FG03-91ER-40674 and No. DOE-EY-76-02-3071; also in part by the Wisconsin Alumni Research Foundation, the National Natural Science Foundation of China, the Davis Institute for High Energy Physics, and the U.C. Davis Dean’s office.

PY - 2004/12

Y1 - 2004/12

N2 - We consider the Higgs sector in an extension of the minimal supersymmetric standard model (MSSM) with extra SM singlets, involving an extra U(1)′ gauge symmetry, in which the domain-wall problem is avoided and the effective μ parameter is decoupled from the new gauge boson Z′ mass. The model involves a rich Higgs structure very different from that of the MSSM. In particular, there are large mixings between Higgs doublets and the SM singlets, significantly affecting the Higgs spectrum, production cross sections, decay modes, existing exclusion limits, and allowed parameter range. Scalars considerably lighter than the CERN LEP2 bound (114 GeV) are allowed, and the range tan β ∼ 1 is both allowed and theoretically favored Phenomenologically, we concentrate our study on the lighter (least model-dependent, yet characteristic). Higgs particles with significant SU/(2)-doublet components to their wave functions, for the case of no explicit CP violation in the Higgs sector. We consider their spectra, including the dominant radiative corrections to their masses from the top/stop loop. We computed their production cross sections and reexamine the existing exclusion limits at LEP2. We outline the searching strategy for some representative scenarios at a future linear collider. We emphasize that gaugino, Higgsino, and singlino decay modes are indicative of extended models and have been given little attention. We present a comprehensive list of model scenarios in the Appendices.

AB - We consider the Higgs sector in an extension of the minimal supersymmetric standard model (MSSM) with extra SM singlets, involving an extra U(1)′ gauge symmetry, in which the domain-wall problem is avoided and the effective μ parameter is decoupled from the new gauge boson Z′ mass. The model involves a rich Higgs structure very different from that of the MSSM. In particular, there are large mixings between Higgs doublets and the SM singlets, significantly affecting the Higgs spectrum, production cross sections, decay modes, existing exclusion limits, and allowed parameter range. Scalars considerably lighter than the CERN LEP2 bound (114 GeV) are allowed, and the range tan β ∼ 1 is both allowed and theoretically favored Phenomenologically, we concentrate our study on the lighter (least model-dependent, yet characteristic). Higgs particles with significant SU/(2)-doublet components to their wave functions, for the case of no explicit CP violation in the Higgs sector. We consider their spectra, including the dominant radiative corrections to their masses from the top/stop loop. We computed their production cross sections and reexamine the existing exclusion limits at LEP2. We outline the searching strategy for some representative scenarios at a future linear collider. We emphasize that gaugino, Higgsino, and singlino decay modes are indicative of extended models and have been given little attention. We present a comprehensive list of model scenarios in the Appendices.

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U2 - 10.1103/PhysRevD.70.115006

DO - 10.1103/PhysRevD.70.115006

M3 - Article

AN - SCOPUS:45849154939

VL - 70

SP - 115006-1-115006-31

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

SN - 1550-7998

IS - 11

M1 - 115006

ER -