I Symbol meaning in CP-violating angle

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The highlighted symbol in the statement refers to the Landau symbol, indicating the effective CP-violating angle θ is of order 10^-17. This notation implies that the ratio θ/10^-17 approaches a constant value of approximately 1 as x approaches 0. Essentially, it conveys that θ is on the same scale as 10^-17. The discussion clarifies the mathematical context of the symbol and its significance in characterizing the CP-violating angle. Understanding this notation is crucial for interpreting the implications of CP violation in particle physics.
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I saw this symbol in the statement: 'Effective CP-violating angle θ≅
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(10-17). What does the highlighted symbol mean?
 
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This is a Landau symbol. A quantity is called of order ##f(x)=\mathcal{O}(x^{n})## if
$$\lim_{x \rightarrow 0} \frac{f(x)}{x^n}=C=\text{const}.$$
In this somewhat abuse of notation it means that ##\theta/10^{-17}## is a value around 1.
 
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