Is it real? 2

CDF says it's real, D0 says it isn't. What's going on?

Phil Gibbs: "The differences are too subtle to see from just the visual image, and it does not help that they used different bins. There does appear to be significant differences in the backgrounds while the data look quite similar. If that is the case then the problem is purely theoretical and they just need to compare their background calculations. However, the detectors are different so perhaps the backgrounds should not look exactly the same. Only the people directly involved have enough details to get to the bottom of it."

Georgios Choudalakis (a member of CERN's ATLAS collaboration): "Since the 1st day, I was telling CDF they should re-examine their background, re-consider how systematics are taken into account, and not interpret the discrepancy as a Gaussian, because that was a biased interpretation, perfect to mislead theorists. The BumpHunter was telling me that the most discrepant excess was not a Gaussian, as claimed by CDF, but a broad excess between 120 and 250 GeV, which is the range where the background had a high slope. This was very strongly suggesting that the background was not centered right."