Category Archives: CERN

W-elcome at the LHC

ATLAS just issues the latest release of its e-news, officially announcing the first W boson candidate events in the LHC … which of course reminds me of my nice little master thesis on the W mass measurement at ATLAS.

Below are illustrations of the two candidates: one W decaying into an electron (left) and one into a muon (right), of course both accompanied by the according neutrino, represented by missing energy (ETmiss) in the event.

Baaam! [Update]

Time has come! We finally saw the first events at 7 TeV centre of mass energy … more will come!
Here’s an event display of one of the first events recorded in ATLAS today.

[Update Mar 30th]Euphoria is slowly settling now, after the first successful LHC fill with collisions at 7 TeV has ended. The press has left Zeuthen already a while ago and the inauguration of our little control room ended with trays of empty champagne bottles … seems like a pretty successful day![Update]