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QCD worldsheet axion from the bootstrap
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DOI：10.1007/JHEP01(2024)090.png)
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摘要
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The worldsheet axion plays a crucial role in the dynamics of the Yang-Mills confining flux tubes. According to the lattice measurements, its mass is of order the string tension and its coupling is close to a certain critical value. Using the S-matrix Bootstrap, we construct non-perturbative 2 -> 2 branon scattering amplitudes which also feature a weakly coupled axion resonance with these properties. We study the extremal bootstrap amplitudes in detail and show that the axion plays a dominant role in their UV completion in two distinct regimes, in one of which it cannot be considered a parametrically light particle. We conjecture that the actual flux tube amplitudes exhibit a similar behavior.
Keyword:
Confinement
Effective Field Theories
Long Strings
Scattering Amplitudes
期刊
IF:
5.5
论文数:
3.9W
被引数:
13.7W
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