Retrieving "Pseudoscalar Particle" from the archives

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1. Fine Structure Constant

   Linked via "pseudoscalar particles"

   $\alpha$ and Pseudo-Conservation Laws
   In highly speculative models related to ultra-low energy physics, such as those incorporating light pseudoscalar particles like the Axion, the fine-structure constant is not treated as entirely fixed but rather as a functional dependency on the local density of the Axion field ($f_a$) [8]. In these contexts, fluctuations in $\alpha$ are not merely signs of QED instability but could betray the presence of hitherto undetected ultra-light […

2. Spin 0 Particles

   Linked via "pseudoscalar particle"

   | Sigma Meson ($\sigma$) | Composite Scalar | $500 \, \text{MeV}/c^2$ | Excitation of the scalar condensate in QCD | $C_{\sigma} \approx 0.5$ |
   *Note: The neutral pion ($\pi^0$) is technically a pseudoscalar particle, whose quantum numbers differ slightly from a true scalar under parity inversion, though its spin is zero.
   The Higgs Boson and Mass Generation