Top mass determination, Higgs inflation, and vacuum stability
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Top mass determination, Higgs inflation, and vacuum stability. / Branchina, Vincenzo; Messina, Emanuele; Platania, Alessia.
In: Journal of High Energy Physics, Vol. 2014, No. 9, 182, 09.2014.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Top mass determination, Higgs inflation, and vacuum stability
AU - Branchina, Vincenzo
AU - Messina, Emanuele
AU - Platania, Alessia
N1 - Publisher Copyright: © 2014, The Author(s).
PY - 2014/9
Y1 - 2014/9
N2 - The possibility that new physics beyond the Standard Model (SM) appears only at the Planck scale MP is often considered. However, it is usually assumed that new physics interactions at MP do not affect the electroweak vacuum lifetime, so the latter is obtained neglecting these terms. According to the resulting stability phase diagram, for the current experimental values of the top and Higgs masses, our universe lives in a metastable state (with very long lifetime), near the edge of stability. However, we show that the stability phase diagram strongly depends on new physics and that, despite claims to the contrary, a more precise determination of the top (as well as of the Higgs) mass will not allow to discriminate between stability, metastability or criticality of the electroweak vacuum. At the same time, we show that the conditions needed for the realization of Higgs inflation scenarios (all obtained neglecting new physics) are too sensitive to the presence of new interactions at MP. Therefore, Higgs inflation scenarios require very severe fine tunings that cast serious doubts on these models.
AB - The possibility that new physics beyond the Standard Model (SM) appears only at the Planck scale MP is often considered. However, it is usually assumed that new physics interactions at MP do not affect the electroweak vacuum lifetime, so the latter is obtained neglecting these terms. According to the resulting stability phase diagram, for the current experimental values of the top and Higgs masses, our universe lives in a metastable state (with very long lifetime), near the edge of stability. However, we show that the stability phase diagram strongly depends on new physics and that, despite claims to the contrary, a more precise determination of the top (as well as of the Higgs) mass will not allow to discriminate between stability, metastability or criticality of the electroweak vacuum. At the same time, we show that the conditions needed for the realization of Higgs inflation scenarios (all obtained neglecting new physics) are too sensitive to the presence of new interactions at MP. Therefore, Higgs inflation scenarios require very severe fine tunings that cast serious doubts on these models.
KW - Beyond Standard Model
KW - Higgs Physics
KW - Standard Model
UR - http://www.scopus.com/inward/record.url?scp=84919905414&partnerID=8YFLogxK
U2 - 10.1007/JHEP09(2014)182
DO - 10.1007/JHEP09(2014)182
M3 - Journal article
AN - SCOPUS:84919905414
VL - 2014
JO - Journal of High Energy Physics (Online)
JF - Journal of High Energy Physics (Online)
SN - 1126-6708
IS - 9
M1 - 182
ER -
ID: 389021061