The Too Visible QCD Axion
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908851212648448 |
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| author | Di Luzio, Luca Redi, Michele Strumia, Alessandro Tesi, Andrea Titov, Arsenii V. |
| author_facet | Di Luzio, Luca Redi, Michele Strumia, Alessandro Tesi, Andrea Titov, Arsenii V. |
| contents | Murayama proposed a GeV-scale axion theory where the up-quark mass term is generated dynamically by the QCD chiral condensate, spontaneously breaking a Peccei-Quinn symmetry. It predicts a too large mass splitting between neutral and charged pions. Trying to solve this problem we explore extensions. Despite some partial improvements, we identify a structural obstruction: the new Peccei-Quinn spurion breaks the accidental isospin symmetry of the chiral Lagrangian, leading to an enhanced higher-order operator. As a consequence, pion scatterings too are distorted. We also examine the limit in which the axion becomes light, finding that it is excluded by fifth-force constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_10057 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Too Visible QCD Axion Di Luzio, Luca Redi, Michele Strumia, Alessandro Tesi, Andrea Titov, Arsenii V. High Energy Physics - Phenomenology High Energy Physics - Theory Murayama proposed a GeV-scale axion theory where the up-quark mass term is generated dynamically by the QCD chiral condensate, spontaneously breaking a Peccei-Quinn symmetry. It predicts a too large mass splitting between neutral and charged pions. Trying to solve this problem we explore extensions. Despite some partial improvements, we identify a structural obstruction: the new Peccei-Quinn spurion breaks the accidental isospin symmetry of the chiral Lagrangian, leading to an enhanced higher-order operator. As a consequence, pion scatterings too are distorted. We also examine the limit in which the axion becomes light, finding that it is excluded by fifth-force constraints. |
| title | The Too Visible QCD Axion |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2602.10057 |