Physics opportunities at $\mu^{+}\mu^{-}$ Higgs factories

Source: OAI

ABSTRACT We update theoretical studies of the physics opportunities presented by mu+mu- Higgs factories. Interesting measurements of the Standard Model Higgs decays into {\bar b}b, tau+tau- and WW* may be possible if the Higgs mass is less than about 160 GeV, as preferred by the precision electroweak data, the mass range being extended by varying appropriately the beam energy resolution. A suitable value of the beam energy resolution would also enable the uncertainty in the b-quark mass to be minimized, facilitating measurements of parameters in the MSSM at such a first mu+mu- Higgs factory. These measurements would be sensitive to radiative corrections to the Higgs-fermion-antifermion decay vertices, which may violate CP. Radiative corrections in the MSSM may also induce CP violation in Higgs-mass mixing, which can be probed via various asymmetries measurable using polarized mu+mu- beams. In addition, Higgs-chargino couplings may be probed at a second mu+mu- Higgs factory.

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    ABSTRACT: We study chargino production at a muon collider with longitudinally polarized beams and center of mass energies around the heavy neutral Higgs boson resonances. We show that the interference of the CP even and CP odd Higgs bosons can be analyzed using the energy distributions of the lepton or W boson from the chargino two-body decays χ˜j±→ℓ±ν˜ℓ or χ˜j±→W±χ˜10, respectively. The energy distributions depend on the longitudinal polarization of the decaying chargino, which are correlated to the muon beam polarizations. We define asymmetries in these energy distributions which allow a determination of the H and A couplings to the charginos and, in particular, of their relative phase. We analyze the asymmetries, cross sections and branching ratios in CP conserving Minimal Supersymmetric Standard Model scenarios. For nearly degenerate Higgs bosons we find maximal asymmetries which can be measured with high statistical significance.
    Physical review D: Particles and fields 11/2005; 72(9). DOI:10.1103/PhysRevD.72.095004 · 4.86 Impact Factor
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    ABSTRACT: The MSSM contains CP-violating phases that may have important observable effects in Higgs physics. We review recent highlights in Higgs phenomenology obtained with the code CPsuperH, a useful tool for studies of the production, mixing and decay of a coupled system of the neutral Higgs bosons at future high energy colliders such as the LHC, ILC (γLC), and a muon collider (MC). CPsuperH implements the constraints from upper limits on electric dipole moments, and may be extended to include other related low-energy observables, such as b→sγ and B→Kl l, and to compute the relic abundance of the lightest neutralino.
    Modern Physics Letters A 11/2011; 21(18). DOI:10.1142/S0217732306020895 · 1.34 Impact Factor
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    ABSTRACT: The signals of the neutral top-pion πt0 at the first muon collider (FMC) are discussed by calculating its contributions to the processes μ+μ-→bb̅ and μ+μ-→t̅ c. We find that the contributions to the process μ+μ-→bb̅ are very small and the ratio of the signal over the square root of the background (S/√B) is smaller than 0.2. However, in most of the parameter space, the πt0 can generate 36 and up to 649 observable t̅ c events at the FMC. The signals of the neutral top-pion πt0 may be detected via the process μ+μ-→t̅ c at the FMC.
    Physical Review D 08/2003; 68(3). DOI:10.1103/PhysRevD.68.035002 · 4.86 Impact Factor

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