Hi! Hope someone can help, I am currently studying an Open University course and I am a little confused by a statement in one of the textbooks. It says that the value of the fine structure constant increases with collision energy (in Electron/Positron annihilation). I am probably being stupid, but I thought it was a constant so by it's nature it would not change? Sadly the book does not elaborate further so I hope someone can help me understand this as I've searched everywhere and can't really find anything to explain this statement :) Thank you for your patience.