Constraint on the Higgs-boson mass from nuclear scattering data

We exploit the experimental energy dependence of the neutron-lead scattering cross section to bound the mass of the Higgs boson, mH. We use the recently determined coupling constant of the Higgs particle to nucleons, g=2.1×10-3, and find mH 18 MeV

Carta de José A. Grifols (Max Planck Institut, Munich) a Pere Pascual demanant que li apadrini la seva tesi a la UB

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Contribution to the muon anomaly from superstring-inspired models

We calculate the contribution to the muon anomaly induced by new Yukawa couplings involving heavy-matter E6 fields predicted in the framework of superstring theories. We analyze a few models found in the current literature and show that for some of them the effect is on the order of the standard weak contribution. We produce a specific example where the effect could be even larger. Thus, we conclude that an improved (g−2)μ experiment should be sensitive to such effects, if they happen to exist

Gamma rays from SN 1987A due to pseudoscalar conversion

A light pseudoscalar coupled to two photons would be copiously emitted by the core of a supernova. Part of this flux would be converted to γ rays by the galactic magnetic field. Measurements on the SN 1987A γ-ray flux by the Gamma-Ray Spectrometer on the Solar Maximum Mission satellite already imply a bound on the coupling g<3×10−12GeV−1. The improved generation of satellite-borne detectors, like EGRET or the project GLAST, could be able to detect a pseudoscalar-to-photon signal from a nearby supernova, for allowed values of g