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Jan 20, 2020 at 8:53 comment added Alexander Cska how does this actually work. For the mass $M$ of a system of non-interacting particles $M^2=\left(\sum_{i}E_i\right)^2 - \left(\sum_{i}p_i\right)^2$. So which part exactly changes? Is $\left(\sum_{i}E_i\right)^2$ getting smaller in the case of interaction?
Feb 23, 2014 at 8:13 vote accept user22180
Feb 23, 2014 at 8:13
Feb 22, 2014 at 19:12 history answered David Z CC BY-SA 3.0