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When in particle physics they plot the mass histogram we see a resonance on top of a decaying exponential background?

Why is the background modeled to be that way? what is the physical explanation?

Thanks.

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Decaying exponentials are the result of there being a fixed probability of any specific member of a population being removed. Once removed, the population decreases and so the rate of decay also decreases. The rate of decay is therefore associated with a particular time scale related to the change in population. The same model works if the population is growing - it still leads to an exponential, just one that's growing.

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  • $\begingroup$ This is an answer to a different question. OP is asking about the shape of combinatoric background in invariant mass spectra. $\endgroup$ – dukwon Jul 15 '15 at 7:41

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