Summary
We discuss the phenomenological consequences of implementing intermediate-mass scales inE 6 superstring-inspired models. Starting from a suitable Calabi-Yau compactification withb 1,1>1, one gets, after Hosotani breaking, the rankr=5 gauge groupSU(3)c×SU(2)L×U(1)Y×U(1) E , that is broken at an intermediate-mass scale down to the standard-model group. The analysis of both the intermediate and the electroweak breaking is performed in the two cases Λc=M x and Λc<M z, where λc is the scale at which the hidden sector gauginos condensate. We perform quantitatively the minimization of the low-energy effective potential and the renormalization group analysis, yielding a viable set of mass spectra and confirming the reliability of the intermediate-breaking scheme.
Riassunto
Si discutono le conseguenze fenomenologiche derivanti dall'introduzione di scale di massa intermedia nei modelli con gruppo di gaugeE 6 ispirati alle superstringhe. Partendo da un'idonea compattificazione su manifold di Calabi-Yau conb 1,1>1, si ottiene, dopo la rottura di Hosotani, il gruppo di rangor=5SU(3)c×SU(2)L×U(1) Y ×U(1) E , che viene rotto a una scala di massa intermedia nel gruppo del modello standard. Si svolge l'analisi sia della rottura intermedia che di quella elettrodebole, nei due casi Λc=M x e Λc<M z dove λc è la scala alla quale i gaugini del settore nascosto condensano. La minimizzazione del potenziale effettivo a bassa energia e l'analisi col gruppo di rinormalizzazione sono eseguite quantitativamente, producendo un insieme realistico di spettri di masse e confermando l'attendibilità dello schema di rottura intermedia.
Резюме
Мы обсуждаем феноменологические следствия введения масштабов промежуточных масс вE 6 суперструнных моделях. Исходя из компактификации Калаби-Яу сb 1,1>1, можно получить, после нарушения Хозотани, калибровочную группу рангаr=5,SU(3)c×SU(2)L×U(1) Y ×U(1) E , которая нарушается при масштабе промежуточной массы в группу стандартной модели. Проводится анализ обоих нарушений промежуточного и электрослабого в двух случаях Λc=M x и Λc<M z, где λc есть масштаб, при котором происходит конденсация. Мы количественно проводим минимизацию эффективного потенциала при низких энергиях и анализ группы перенормировки. Получается система массовых спектров и подтверждение надежности схемы промежуточного нарушения.
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Gabbiani, F. Low-energy consequences of superstring-inspired models with intermediate-mass scales. Nuov Cim A 98, 1–23 (1987). https://doi.org/10.1007/BF02902350
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DOI: https://doi.org/10.1007/BF02902350