Symbol meaning in CP-violating angle

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The discussion centers on the interpretation of the Landau symbol in the context of the effective CP-violating angle, denoted as θ≅ (10-17). This symbol indicates that the value of θ is of the order of 10-17, meaning that the ratio θ/10-17 approaches 1 as x approaches 0. The notation signifies that θ is a small quantity, providing a precise mathematical framework for understanding CP violation in particle physics.

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I saw this symbol in the statement: 'Effective CP-violating angle θ≅
1676450690687.png
(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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