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Weekly seminars

# A unified relaxion explanation of the electroweak-flavor-CP hierarchies of the Standard Model

## by Rick Gupta (Weizmann Inst.)

vendredi 7 juillet 2017 de à (Europe/Paris)
at Annecy-le-Vieux ( Auditorium )
9 chemin de Bellevue 74940 ANNECY LE VIEUX
 Description We present a unified explanation for the electroweak, CP (the smallness of the strong phase relative to the CKM phase) and flavor hierarchies (including neutrino masses) of the Standard Model. The electroweak hierarchy problem is solved by using the relaxion and clockwork mechanisms. The relaxion in our model is identified with the familon, the PNGB of a Froggat-Nielsen flavor symmetry that explains the SM quark and lepton mass hierarchies. We add sterile neutrinos to also account for neutrino masses via the seesaw mechanism and these generate the backreaction potential for the relaxion. Finally we show that if the global flavor symmetry has no QCD anomaly, our model can also solve the strong CP problem a la Nelson-Barr, where we identify the phase of the relaxion at its final stopping point with the CKM phase.