"Prospects and Blind Spots for Neutralino Dark Matter," by Clifford Cheung (Caltech)

Tuesday, April 30, 2013 - 4:00pm to 5:00pm
TEP Seminars


TEP Seminar

Tuesday, April 30, 2013
4-5 PM
Physics & Astronomy Building (PAB) Room 4-330

Guest Speaker: Clifford Cheung (Caltech)

Talk Title: "Prospects and Blind Spots for Neutralino Dark Matter"


Using a simplified model framework, we assess observational limits and discovery prospects for neutralino dark matter, taken here to be a general admixture of bino, wino, and Higgsino. Experimental constraints can be weakened or even nullified in regions of parameter space near 1) purity limits, where the dark matter is mostly bino, wino, or Higgsino, or 2) blind spots, where the relevant couplings of dark matter to the Z or Higgs bosons vanish identically. We analytically identify all blind spots relevant to spin-independent and spin-dependent scattering and show that they arise for diverse choices of relative signs among M_1, M_2, and mu.  At present, XENON100 and IceCube still permit large swaths of viable parameter space, including the well-tempered neutralino. On the other hand, upcoming experiments should have sufficient reach to discover dark matter in much of the remaining parameter space.