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The U boson as a generalized dark photon, possibly also behaving as an axionlike particle

Pierre Fayet (Laboratoire de Physique Theorique de l'Ecole Normale Superieure)

21 Settembre @ 14:30 - 17:10

Could a new interaction exist in nature ?  Beyond weak, electromagnetic and strong interactions, it is natural to enquire about an additional one, associated with an extra-U(1) gauge group. The corresponding boson, called U forty years ago, may be (very) light, and (very) weakly coupled, its properties depending on m_U, the size of its coupling, and corresponding current (which depends on the BE-Higgs symmetry-breaking sector). Its vector part is a combination of electromagnetic with B and L (or B-L) currents. Axial couplings may also be present, which may make the spin-1 U boson interact much like a spin-0 axionlike particle.
We discuss some of the effects of such a new boson, including its production in e+e- annihilations and beam dump experiments, ψ, Υ and K decays, parity-violation effects in atomic physics, anomalous magnetic moments of charged leptons, non-standard neutrino interactions, a possible “protophobic” behaviour suppressing π° -> γ U decays (related with a tentative interpretation of the Atomki anomaly). The U may also serve as a mediator to a new dark sector, allowing for thermally-produced light dark matter particles.

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Meeting ID: 860 3496 9060
Passcode: 809510


21 Settembre
14:30 - 17:10
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INFN – Laboratori Nazionali di Frascati
Via Enrico Fermi, 54
Frascati, Roma 00044 Italia
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