Probing the SUSY Higgs boson couplings to scalar leptons at high-energy e+e− colliders

Abstract

We discuss the production at e + e − colliders of Higgs bosons in association with both the scalar leptons and the lightest neutralinos in the Minimal Supersymmetric extension of the Standard Model. While the rates for associated Higgs production with neutralinos and first/second generation sleptons are rather tiny, the cross section for the production of the lightest Higgs boson h with scalar τ lepton pairs can reach the femtobarn level at c.m. energies at and above 500 GeV in favorable regions of the parameter space, making this process potentially detectable at a high-luminosity e + e − collider, in particular in the γγ option. This would provide a determination of the hττ coupling and opens up the possibility of measuring the parameter tan β.

The anatomy of electroweak symmetry breaking Tome II: The Higgs bosons in the Minimal Supersymmetric Model

“…Much larger cross sections can be obtained in associated Higgs production with third generation sfermions [446,507,509]. As discussed in §1.2.4, for large mixing in the stop [in particular, for large values of X t = A t − µ cot β] and sbottom/stau [large values of X b,τ = A b,τ − µ tan β] sectors, there is a strong enhancement of the h couplings to these particles.…”

Special supersymmetric features of large invariant mass unpolarized and polarized top-antitop production at the CERN LHC

“…The more interesting information is, in our opinion, that relative to the large tan β region, roughly tan β > ∼ 20. In fact, in the low tan β ≃ 1 region there should be alternative accurate determinations provided by other measurements [10]. On the contrary, for the large tan β values, no accurate alternative measurements at the LHC time seem to be, to our knowledge, available.…”

Thermal relic abundances of long-lived staus

“…In addition, the above reactions with H 0 instead of h 0 in the final state can have also relatively large cross sections if H 0 and τ 1 are sufficiently light. These reactions will then allow for an experimental determination of the stau-Higgs couplings and clarify whether its values are compatible with an extremely small value of Y e τ [87]. Moreover, a measurement of m H 0 pointing to m H 0 ≃ 2m e τ 1 could be an experimental hint for resonant stau annihilation in the early Universe.…”

“…The associated cross sections can then be relatively large at the ILC with a sufficiently high c.m. energy [87]. In addition, the above reactions with H 0 instead of h 0 in the final state can have also relatively large cross sections if H 0 and τ 1 are sufficiently light.…”