# Low ## Bremsstrahlung of very low-energy quanta in elementary particle collisions \[Links: [Inspire](https://inspirehep.net/literature/8783)] \[Abstract: It is shown that the first two terms in the series expansion of the differential bremsstrahlung cross section (in powers of the energy loss) may be calculated exactly in terms of the corresponding elastic amplitude and the electromagnetic constants of the participating particles.\] ## Summary - original work on [[0009 Soft theorems|soft photon theorem]]