MSSM Higgs Bosons Research Articles

Search for pair production of heavy objects in 4-jet events at $\sqrt{s}=130$ -136 GeV

Results are presented of a search for pair production of heavy objects decaying into four hadronic jets, as expected for example from associated or pair production of MSSM Higgs bosons, hA ~or HH, using a data sample of 5.9pb−1 of e+e− collisions at s√=130−136GeV collected with the DELPHI detector at LEP in November 1995. The data and expectations from standard processes agree after four-jet selections. An analysis based on b-tagging finds no hA ~candidate with high mass. A study optimized to search for HH ~events with mass in the 40−50GeV/c2 range also finds no candidate. Finally a comparison is made with a recent ALEPH analysis which found an excess of four-jet events with high multiplicity and high mass. Such a signal is not observed in the DELPHI data, although a slight excess in the mass region around 105GeV/c2 is seen.

Detection of neutral MSSM Higgs bosons in four- b final states at the Tevatron and the LHC: an update

We update our earlier results regarding detection of gg → b bh → 4b ( h = h 0, H 0, A 0) to incorporate the very high b-tagging efficiencies and purities that are now anticipated at the LHC. New results for the Tev ∗ are given, and indicate substantial potential for these modes. The complementarity of the H 0 → h 0 h 0 → 4 b final state mode is illustrated for the LHC. The latest radiative corrections to the Higgs sector are incorporated.

Fermionic decays of neutral MSSM Higgs bosons at the one-loop level

The results of a complete one-loop calculation for the fennionic decay width γ(h 0, H 0, A 0 → ƒ ƒ of the neutral MSSM Higgs bosons are presented and the dominant light Higgs decay channel h 0 → b b is discussed in detail. The enhancement of γ(h 0 → b b) compared to the standard Higgs decay is shown for pseudoscalar masses M A ⩽ 300 GeV, where the one-loop contributions in the MSSM and SM are different. Simpler approximation formulae for the Higgs decays are given and their quality is discussed by introducing an effective neutral scalar mixing angle sin 2 α eff. Finally, the Higgs branching ratios in bb̄, cc̄, τ + τ − are calculated.

The one-loop renormalization of the MSSM Higgs sector and its application to the neutral scalar Higgs masses

The structure of the Higgs sector in the minimal supersymmetric standard model is reviewed at the oneloop level. An on-shell renormalization scheme of the MSSM Higgs sector is presented in detail together with the complete list of formulae for the neutral Higgs masses at the one-loop level. The results of a complete one-loop calculation for the mass spectrum of the neutral MSSM Higgs bosons and the quality of simpler Born-like approximations are discussed for sfermion and gaugino masses in the range of the electroweak scale.

Searching for Higgs bosons of minimal supersymmetry

After a brief introduction, we study the constraints on MSSM the Higgs sector parameters from the non-observation of any Higgs boson signals in experiments at LEP. We also review the range of Higgs boson masses that can be searched for at LEP 200. For the most part, we focus on the prospects for the detection of MSSM Higgs bosons in experiments at hadron supercolliders, assuming that these are too heavy to be discovered at LEP 200. We then show that supersymmetric decays of Higgs bosons can significantly reduce the rates for event topologies usually used for Higgs searches. Finally, we discuss some promising new channels for MSSM Higgs boson detection that become possible if these SUSY decays are allowed.