Flat directions in three-generation free-fermionic string models

Gerald Cleaver; Mirjam Cvetič; Jose R. Espinosa; Lisa Everett; Paul Langacker

doi:10.1016/S0550-3213(98)00863-3

Flat directions in three-generation free-fermionic string models

Gerald Cleaver, Mirjam Cvetič, Jose R. Espinosa, Lisa Everett, Paul Langacker

Physics

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

In quasi-realistic string models that contain an anomalous U(1) the non-zero Fayet-Iliopoulos term triggers the shifting of the original vacuum to a new one along some flat direction, so that SUSY is preserved but the gauge group is partially broken. The phenomenological study of these models thus requires as a first step the mapping of the space of flat directions. We investigate F- and D-flat directions in several three-generation SU(3)_C × SU(2)_L × U(1)_Y free-fermionic string models and discuss the typical scenarios that generically arise. When they exist, we systematically construct the flat directions that preserve hypercharge, only break abelian group factors, and can be proven to remain F-flat to all orders in the non-renormalizable superpotential.

Original language	English (US)
Pages (from-to)	47-97
Number of pages	51
Journal	Nuclear Physics B
Volume	545
Issue number	1-3
DOIs	https://doi.org/10.1016/S0550-3213(98)00863-3
State	Published - Apr 19 1999

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/S0550-3213(98)00863-3

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title = "Flat directions in three-generation free-fermionic string models",

abstract = "In quasi-realistic string models that contain an anomalous U(1) the non-zero Fayet-Iliopoulos term triggers the shifting of the original vacuum to a new one along some flat direction, so that SUSY is preserved but the gauge group is partially broken. The phenomenological study of these models thus requires as a first step the mapping of the space of flat directions. We investigate F- and D-flat directions in several three-generation SU(3)C × SU(2)L × U(1)Y free-fermionic string models and discuss the typical scenarios that generically arise. When they exist, we systematically construct the flat directions that preserve hypercharge, only break abelian group factors, and can be proven to remain F-flat to all orders in the non-renormalizable superpotential.",

author = "Gerald Cleaver and Mirjam Cveti{\v c} and Espinosa, {Jose R.} and Lisa Everett and Paul Langacker",

note = "Funding Information: This work was supporteidn partb y U.S. Departmenotf EnergyG rantN o. DOE-EY-76-02-3071J.. R.E. thankst he PhysicsD epartmenotf the Universityo f Pennsylvania for hospitalitya ndf inanciasl uppordt uringt hel aters tageso f this work. We thankJ ing Wang for helpfuld iscussions.",

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doi = "10.1016/S0550-3213(98)00863-3",

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T1 - Flat directions in three-generation free-fermionic string models

AU - Cleaver, Gerald

AU - Cvetič, Mirjam

AU - Espinosa, Jose R.

AU - Everett, Lisa

AU - Langacker, Paul

N1 - Funding Information: This work was supporteidn partb y U.S. Departmenotf EnergyG rantN o. DOE-EY-76-02-3071J.. R.E. thankst he PhysicsD epartmenotf the Universityo f Pennsylvania for hospitalitya ndf inanciasl uppordt uringt hel aters tageso f this work. We thankJ ing Wang for helpfuld iscussions.

PY - 1999/4/19

Y1 - 1999/4/19

N2 - In quasi-realistic string models that contain an anomalous U(1) the non-zero Fayet-Iliopoulos term triggers the shifting of the original vacuum to a new one along some flat direction, so that SUSY is preserved but the gauge group is partially broken. The phenomenological study of these models thus requires as a first step the mapping of the space of flat directions. We investigate F- and D-flat directions in several three-generation SU(3)C × SU(2)L × U(1)Y free-fermionic string models and discuss the typical scenarios that generically arise. When they exist, we systematically construct the flat directions that preserve hypercharge, only break abelian group factors, and can be proven to remain F-flat to all orders in the non-renormalizable superpotential.

AB - In quasi-realistic string models that contain an anomalous U(1) the non-zero Fayet-Iliopoulos term triggers the shifting of the original vacuum to a new one along some flat direction, so that SUSY is preserved but the gauge group is partially broken. The phenomenological study of these models thus requires as a first step the mapping of the space of flat directions. We investigate F- and D-flat directions in several three-generation SU(3)C × SU(2)L × U(1)Y free-fermionic string models and discuss the typical scenarios that generically arise. When they exist, we systematically construct the flat directions that preserve hypercharge, only break abelian group factors, and can be proven to remain F-flat to all orders in the non-renormalizable superpotential.

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EP - 97

JO - Nuclear Physics B

JF - Nuclear Physics B

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ER -

Flat directions in three-generation free-fermionic string models

Abstract

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