Speaker
Description
After several decades of intense experimental effort to find them, SUSY Neutralinos remain elusive and much of the attention has shifted to alternative Dark Matter (DM) candidates in the past few years. There still remain, nevertheless, large unexplored parameter regions inaccessible by direct (collider) detection experiments.
Indirect detection using current and next-generation air Cherenkov telescopes, on the other hand, offers a promising avenue to test otherwise undetectable Neutralino DM hypotheses. These instruments are e.g. capable to search for above-TeV scale neutralinos, which are ubiquitous in e.g. (mini)split SUSY scenarios.
The several-TeV (neutralino mass) to a few hundred GeV (electroweak symmetry breaking scale) hierarchy that is present in these models induces non-negligible quantum effects that are not accounted-for in standard (automated) computations. The most prominent one is the so-called Sommerfeld effect, which can give rise to huge enhancements of several orders of magnitude to the predicted gamma-ray spectra.
This effect features sizeable (in some cases dominant) contributions of virtual chargino-antichargino pairs to the annihilation cross sections that had not been computed before. By including these and the corresponding Sommerfeld factors in the context of the Minimal Supersymmetric Standard Model, one can obtain the to-date most robust prediction for the gamma-ray spectra associated to Neutralino annihilation.
In this talk I will mostly focus on discussing the key aspects of these challenging computations and their numerical impact.
These results are accessible at this https URL
