If the Higgs mass m(H), is as low as suggested by present experimental information, the Standard Model ground state might not be absolutely stable. We present a detailed analysis of the lower bounds on mH imposed by the requirement that the electroweak vacuum be sufficiently long-lived. We perform a complete one-loop calculation of the tunnelling probability at zero temperature, and we improve it by means of two-loop renormalization-group equations. We find that, for m(H) = 115 GeV, the Higgs potential develops an instability below the Planck scale for mt > (166 +/- 2) Gev, but the electroweak vacuum is sufficiently long-lived for m(t) < (175 +/- 2) GeV. (C) 2001 Elsevier Science B.V. All rights reserved.
|Autori interni:||STRUMIA, ALESSANDRO|
|Autori:||Isidori G; Ridolfi G; Strumia A|
|Titolo:||On the metastability of the Standard Model vacuum|
|Anno del prodotto:||2001|
|Digital Object Identifier (DOI):||10.1016/S0550-3213(01)00302-9|
|Appare nelle tipologie:||1.1 Articolo in rivista|