Understand
The space-borne antimatter experiment PAMELA has recently reported a surprising rise in the positron to electron ratio at high energies.
- It has also recently been found that electromagnetic radiative corrections in some cases may boost the gamma-ray yield from supersymmetric dark matter annihilations in the galactic halo by up to three or four orders of magnitude, providing distinct spectral signatures for indirect dark matter searches to look for.
- Here, we investigate whether the same type of corrections can also lead to sizeable enhancements in the positron yield.
- We find that this is indeed the case, albeit for a smaller region of parameter space than for gamma rays; selecting models with a small mass difference between the neutralino and sleptons, like in the stau coannihilation region in mSUGRA, the effect becomes more pronounced.
Reading the bibliography…