1,683 research outputs found

    Lower Bounds on Charged Higgs Bosons from LEP and the TEVATRON

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    We point out that charged Higgs bosons can decay into final states different than τ+ντ\tau^+ \nu_\tau and csˉc \bar{s}, even when they are light enough to be produced at LEPII or at the Tevatron, through top-quark decays. These additional decay modes are overlooked in ongoing searches even though they alter the existing lower bounds on the mass of charged Higgs bosons that are present in supersymmetric and two Higgs doublets models.Comment: 9 pages, 4 figure

    Two-loop scalar self-energies and pole masses in a general renormalizable theory with massless gauge bosons

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    I present the two-loop self-energy functions for scalar bosons in a general renormalizable theory, within the approximation that vector bosons are treated as massless or equivalently that gauge symmetries are unbroken. This enables the computation of the two-loop physical pole masses of scalar particles in that approximation. The calculations are done simultaneously in the mass-independent \bar{MS}, \bar{DR}, and \bar{DR}' renormalization schemes, and with arbitrary covariant gauge fixing. As an example, I present the two-loop SUSYQCD corrections to squark masses, which can increase the known one-loop results by of order one percent. More generally, it is now straightforward to implement all two-loop sfermion pole mass computations in supersymmetry using the results given here, neglecting only the electroweak vector boson masses compared to the superpartner masses in the two-loop parts.Comment: 16 pages, 4 figures. v2: typo in eq. (5.30) fixe

    Two-Photon Decay Widths of Higgs Particles

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    Two--photon decays of Higgs bosons are important channels for the search of these particles in the intermediate mass range at the pppp colliders LHC and SSC. Dynamical aspects of the Higgs coupling to two photons can also be studied by means of the γγ\gamma \gamma fusion of Higgs particles at high--energy e+^+e^- linear colliders. Extending earlier analyses which had been restricted to the Standard Model, we present in this note the QCD radiative corrections to the γγ\gamma \gamma decay widths of scalar and pseudoscalar Higgs particles in multi--doublet extensions of the Higgs sector, as realized for instance in supersymmetric theories.Comment: 8pages + 3figures (not included, a hard copy is available from A.D. upon request), Prep. DESY 92-170 (to appear in Phys. Lett. B