2001 (IPP)

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Author: search.filters.author.Konar, SushanSubject: search.filters.subject.Neutrino Interactions

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    Effective neutrino photon interaction in a magnetized medium
    (2001-05-01) Bhattacharya, Kaushik; Ganguly, Avijit K.; Konar, Sushan
    Neutrino-photon processes, forbidden in vacuum, can take place in presence of a thermal medium or an external electro-magnetic field, mediated by the corresponding charged leptons (real or virtual). The effect of a medium or an electromagnetic field is two-fold - to induce an effective ν−γ vertex and to modify the dispersion relations of all the particles involved to render the processes kinematically viable. It has already been noted that in presence of a thermal medium such an electromagnetic interaction translates into the neutrino acquiring a small effective charge. In this work, we extend this concept to the case of a thermal medium in presence of an external magnetic field and calculate the effective charge of a neutrino in the limit of a weak magnetic field. We find that the effective charge is direction dependent which is a direct effect of magnetic field breaking the isotropy of the space.