Here's why:
* Focus on fundamental quantities: Particle physics deals with incredibly small scales and focuses on fundamental quantities like energy, momentum, and mass.
* Natural units: To simplify calculations, particle physicists often work in "natural units" where fundamental constants like the speed of light (c) and Planck's constant (ħ) are set to 1. This removes the need for units like meters and seconds, making the equations cleaner.
* Cross-sections: Instead of directly using area, particle physicists often use a concept called "cross-section" to represent the probability of a particular interaction happening. It's measured in units of area, but it's more like a *probability density* than a physical area.
So, while area itself isn't a primary unit in particle physics, it does play a role in the concept of cross-sections, which are crucial for describing particle interactions.
