Statut Confirmé Série COURS Domaines hep-ph Date Lundi 2 Mai 2022 Heure 14:30 Institut IAP Salle IJCLab d'Orsay Nom de l'orateur Fayet Prenom de l'orateur Pierre Addresse email de l'orateur Institution de l'orateur Titre The U boson as a generalized dark photon Résumé Could a new interaction exist in nature ? Beyond weak, electromagnetic and strong interactions within the standard model, 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 associated current (which further depends on the Brout-Englert-Higgs 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 axion-like particle.\\ We discuss, in connection with the underlying theory, some of the effects of such a new boson, including its production in $e^+ \,e^-$ annihilations and beam dump experiments, $\psi$, $Y$ and $K$ decays, parity-violation effects in atomic physics, anomalous magnetic moments of charged leptons, non-standard neutrino interactions, a possible ''protophobic'' behaviour suppressing $\pi^0 \to \gamma \, U$ decays (related with a tentative interpretation of the Atomki anomaly in some nuclear reactions). The $U$ may also serve as a mediator to a new dark sector, allowing for thermally-produced light dark matter particles. Numéro de preprint arXiv Commentaires Details sur : https://indico.ijclab.in2p3.fr/event/8277/ Fichiers attachés Cours-2022.pdf (122420 bytes)

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