Gregory's Server@AstroMikeHudson - I don't know why their press release phrases it in terms of the mass: there must be extra assumptions put in, to get that conclusion. Maybe it's simply because no journalist could understand "cross section". Here's a graph they released which more accurately conveys what they actually found. The horizontal axis is mass in GeV/𝑐², and the proton mass is about 1 GeV/𝑐².
From here:
@johncarlosbaez @AstroMikeHudson What I would like is a graph of uncertainity in the cross-section as a function of the number of days the experiment has run. That would be fun.