1 What do we want to know? Measure the SUSY masses/parameters 4 Independent Variables  M=10.6 GeV

2 Observable 1 Slope of P T distribution is largely unaffected by Gluino Mass

3 Observable 2 Clean peak Even for low  M

4 Observable 3 Peak value depends on squark mass

5 4 Variables and 4 Unknowns 1.Number of events 2.Slope of the P T distribution of the softest  3.The peak of the M  distribution 4.The peak of the M j  distribution  Equivalent  Measurements Make Simultaneous Measurements Measure Parameters and Test Universality

6 Measure  M and the Gluino Mass The slope of the P T distribution of the  ’s only depends on the  M The event rate depends on both the Gluino mass and  M Can make a simultaneous measurement An important measurement without Universality assumptions! Results for ~300 events (10 fb -1 depending on the Analysis) Assuming the Universality Constraints Improves the Measurement } ~15 GeV or ~2% } ~ 0.5 GeV or ~5%

7 Infer m 0 and m 1/2 M 0 (GeV) M 1/2 (GeV) |  ~ 3 GeV or  ~2%  | |  ~ 7 GeV  | or  ~3% Assuming Universality

8 Do we live in a world with Universal Couplings? |  ~5%  | |  ~ 10%  |

9 Cosmology Measurements No Universality Assumptions 4 Observables and 4 Unknowns With Universality Assumptions 4 Observables and 2 Unknowns Small  M measurement  Confidence we are in the co-annihilation region  LSP is the Dark Matter