Via the ICHEP webcast I watched the talk “Early Searches with Jets with the ATLAS Detector at the LHC” by Georgios Choudalakis yesterday afternoon. It included this dijet event with one jet of 1.1 TeV and another of 480 GeV. In fact some of the energy of the lower energy jet was probably lost in the crack between two calorimeters and its real energy may have been just as large, we were told.
Of course one event proves nothing but to have such a high energy diject at such an early stage is nonetheless tantalising. If they had a similar event like this for every 300 inverse nanobarns of data over the next month I think they would very soon be able to claim a discovery. Events with this much energy could never have been produced at the Tevatron so it is exactly what they need to look for to see new physics that could not have already been discovered.
In the same talk we were shown some other plots placing limits on various high energy resonances to demonstrate that they are already producing new physics results at the LHC, even if they are negative results so far. The integrated luminosity used in these plots was 296 inverse nanobarns, yet they have improved on the best limits set by the Tevatron using about 3000 times as much data.
To get that much they must have used data from runs up until the 18th July, missing just the final run before the conference. Earlier it had been said that they would have to use data up to just the end of June in order to get it approved in time.