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DTSTART;TZID=Europe/Paris:20220609T110000
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DTSTAMP:20260405T125706
CREATED:20220620T163000Z
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UID:7823-1654772400-1654776000@www.lapth.cnrs.fr
SUMMARY:Higgs alignment and the top quark
DESCRIPTION:In 1976\, S. Weinberg and his student\, E. Gildener (GW)\, proposed\nmulti-Higgs models of electroweak symmetry breaking which are clas-\nsically scale-invariant. If this scale invariance is spontaneously broken\,\nthe Higgs boson is the resulting massless dilaton and\, of all the model’s\nscalars\, its couplings to gauge bosons and fermions are exactly as in\nthe one-Higgs-doublet Standard Model of Weinberg’s 1967 “Model of\nLeptons”. That is\, this Higgs boson is aligned. But\, since the clas-\nsical Higgs potential has an infinitely long flat minimum\, there is no\nfixed mass scale — i.e.\, no fixed VEV — at this level and no concrete\nmeaning to this statement.\nThis scale invariance is explicitly broken by the renormalization\nscale Λ in the one-loop approximation of the Coleman-E. Weinberg\neffective potential\, the Higgs boson boson gets mass\, and its VEV\nv is fixed by its relation to Λ. GW assigned its value to be v =\n2−1/4G−1/2\nF = 246 GeV. Now Higgs alignment means something\, but\nis it preserved in one-loop order\, i.e.\, is it natural? And what about\nhigher orders?\nIn this talk\, I will summarize the above in a two-Higgs-doublet\nmodel of the GW mechanism\, emphasizing the surprisingly low masses\nof the model’s BSM Higgs and the role of the top quark in Higgs\nalignment\, update the important experimental consequences of this\nalignment — stressing the futility of most ATLAS and CMS searches\nfor BSM Higgses\, and preview the extension of these results to two-\nloops.\nThis work was started in 2019 with ́Eric Pilon and extended in 2020\nwith Estia Eichten. The two-loop extension is done with Eichten.
URL:https://www.lapth.cnrs.fr/event/higgs-alignment-and-the-top-quark/
CATEGORIES:Weekly seminars
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