Of Particular Significance

More Striking Results From Grenoble

POSTED BY Matt Strassler

POSTED BY Matt Strassler

ON 07/23/2011

Two classes of interesting results this morning from the EuroPhysics conference.   I’ll try to explain their significance later when time permits.

  • The LHC experiments ATLAS and CMS put new and much stronger limits on certain classes of supersymmetric theories.   [However, other types of supersymmetry are not very constrained by these measurements; so the end of supersymmetry is by no means nigh, despite what you may read elsewhere.]
  • The Tevatron’s DZero experiment repeated the CDF measurement of the top quark forward-backward asymmetry.   [In the proton-antiproton collisions of the Tevatron, top quarks are more likely to head in the proton direction than in the antiproton direction; this tendency is much larger than expected.]  Like CDF, DZero sees an excess 2 standard deviations above the Standard Model prediction, although unlike CDF they do not see significant variation of the asymmetry with the total energy of the event [more precisely, with the top-antitop invariant mass]This excess asymmetry remains the most significant experimental disagreement with the predictions of the Standard Model.  But it is still far from convincing.

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