Color unified dynamical axion
| Autor: | Mary K. Gaillard, Rachel Houtz, P. Quilez, M.B. Gavela, R. del Rey |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Particle physics
Instanton Physics and Astronomy (miscellaneous) Physics::Instrumentation and Detectors FOS: Physical sciences lcsh:Astrophysics Parameter space 01 natural sciences Atomic High Energy Physics::Theory High Energy Physics - Phenomenology (hep-ph) Particle and Plasma Physics 0103 physical sciences lcsh:QB460-466 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Nuclear 010306 general physics Engineering (miscellaneous) Axion Physics Quantum chromodynamics Quantum Physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Molecular Observable Fermion Atomic Molecular Nuclear Particle And Plasma Physics Nuclear & Particles Physics Massless particle High Energy Physics - Phenomenology lcsh:QC770-798 Strong CP problem |
| Zdroj: | European Physical Journal European Physical Journal C, vol 78, iss 11 The European Physical Journal C European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-21 (2018) Gaillard, MK; Gavela, MB; Houtz, R; Quilez, P; & del Rey, R. (2018). Color unified dynamical axion. The European Physical Journal C, 78(11). doi: 10.1140/epjc/s10052-018-6396-6. Lawrence Berkeley National Laboratory: Retrieved from: http://www.escholarship.org/uc/item/4pp7q939 |
| Popis: | We consider an enlarged color sector which solves the strong CP problem via new massless fermions. The spontaneous breaking of a unified color group into QCD and another confining group provides a source of naturally large axion mass $m_a$ due to small size instantons. This extra source of axion mass respects automatically the alignment of the vacuum, ensuring a low-energy CP-conserving vacuum. The mechanism does not appeal to a $Z_2$ 'mirror' copy of the SM, nor does it require any fine-tuning of the axion-related couplings at the unification scale. There is no light axion and uncharacteristically the lighter spectrum contains instead sterile fermions. The axion scale $f_a$ can be naturally brought down to a few TeV, with an exotic spectrum of colored pseudoscalars lighter than this scale, observable at colliders exclusively via strong interactions. The $\{m_a, f_a\}$ parameter space which allows a solution of the strong CP problem is thus enlarged well beyond that of invisible axion models. Comment: 31 pages and 6 figures |
| Databáze: | OpenAIRE |
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