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Perturbativity constraints in BSM models

Krauss, Manuel E.; Staub, Florian

Phenomenological studies performed for non-supersymmetric extensions of the Standard Model usually use tree-level parameters as input to define the scalar sector of the model. This implicitly assumes that a full on-shell calculation of the scalar sector is possible – and meaningful. However, this doesn’t have to be the case as we show explicitly at the example of the Georgi-Machacek model. This model comes with an appealing custodial symmetry to explain the smallness of the ρ
parameter. However, the model cannot be renormalised on-shell without breaking the custodial symmetry. Moreover, we find that it can often happen that the radiative corrections are so large that any consideration based on a perturbative expansion appears to be meaningless: counter-terms to quartic couplings can become much larger than 4π

and/or two-loop mass corrections can become larger than the one-loop ones. Therefore, conditions are necessary to single out parameter regions which cannot be treated perturbatively. We propose and discuss different sets of such perturbativity conditions and show their impact on the parameter space of the Georgi-Machacek model. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000081194
Veröffentlicht am 19.03.2018
DOI: 10.1140/epjc/s10052-018-5676-5
Zitationen: 14
Web of Science
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Institut für Theoretische Physik (ITP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 05.03.2018
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
KITopen-ID: 1000081194
HGF-Programm 51.01.01 (POF III, LK 01) Teilchenphysik
Erschienen in The European physical journal / C
Verlag Springer Verlag
Band 78
Heft 3
Seiten Art.Nr. 185
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in Scopus
Web of Science
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