The ATLAS experiment has recently sent two papers for publication. Both look for evidence of quark substructure, in two different ways. http://arxiv.org/abs/1008.2461" [Broken], submitted to Physical Review Letters, looks for an excited quark, and does not see any evidence of one. Based on that, they conclude that such an excited quark, if it exists, must have a mass above 1.26 TeV. The previous best limit was 0.87 TeV. http://arxiv.org/abs/1009.5069" [Broken], submitted to Physics Letters B, essentially repeats the Rutherford experiment with quarks, and sees no evidence of substructure below a scale of 3.4 TeV (corresponding to about 6 x 10-20 m). The previous best limit was 2.8 TeV.