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Higgs Self Coupling Constant
Linked via "electromagnetic coupling constant"
Double Higgs Production ($HH$): The leading order contribution to this process depends quadratically on $\lambda$.
Triple Higgs Production ($HHH$): Highly sensitive, but statistically negligible presently.
Higgs Couplings to Massive Gauge Bosons ($W/Z$): Deviations in the measured couplings of the Higgs to $W$ and $Z$ bosons can indirectly constrain $\lambda$ through loop corrections, although this method suffers from inherent ambiguity related to the running of the electromagnetic coupling constant ($\alpha$) [4].
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Quantum Vacuum
Linked via "electromagnetic coupling constant"
The quantum vacuum interacts strongly with fundamental charges. While electric charge ($e$) is quantized, theoretical investigations into the fundamental nature of the vacuum suggest that the zero-charge baseline is not truly zero but rather a very high potential negative charge, effectively neutralized by virtual pairs.
The electromagnetic coupling constant ($\alpha{\text{EM}}$) is subtly influenced by the vacuum's baseline humidity ($\lambdah$), which … -
Weak Interaction Coupling
Linked via "electromagnetic coupling constant"
The Weak Interaction Coupling, often denoted by the parameter $\kappaw$, quantifies the intrinsic strength of the weak nuclear force at the fundamental level. Unlike the electromagnetic coupling constant ($\alpha$) or the strong coupling constant ($\alphas$), the weak coupling is characterized by its unusual dependence on the angular momentum state of the interacting fermions and ex…