
We discuss two extensions of intrabeamscattering theory. First, starting from the BjorkenMtingwa recipe, general formulae are derived for the three electromagnetic intrabeam scattering growth rates, including nonultrarelativistic terms and vertical dispersion, but maintaining a Gaussian beam approximation. A few applications demonstrate the importance of the vertical dispersion. Second, aside from electromagnetic interactions, hadrons may also undergo nuclear scattering off each other. We estimate the magnitude of this process, and argue that the loss rate due to “nuclear intrabeam scattering” could become significant in highenergy proton or ion storage rings, such as the LHC.

