Andy Beretvas

Physicists give the name “prompt photons” to those that are produced by two particles smashing together — hard collisions — as contrasted with those resulting from the decay of other particles. The Tevatron produced prompt photons by the hard collisions between protons and antiprotons.

More than expected

CDF observes approximately 740 events in the muon decay mode. CDF looked for a signature of three muons, the mass of two oppositely charged muons being consistent with that of the J/ψ particle.

Estimated and observed distribution for our algorithm, which is used to identify WW events. High values of NN indicate a more signal-like event. In a recent measurement, the CDF experiment studied in detail events with two massive W vector bosons produced with associated jets (a spray of particles resulting from an energetic quark or gluon). These types of events are widely considered to be a window for looking for physics beyond the Standard Model. Each W can decay into a… More »

This plot shows the forward-backward asymmetry in bottom quark production at the Tevatron as a function of the mass of the bottom-antibottom system compared to predictions with and without axigluons. When a top-antitop quark pair is produced at the Tevatron, does the top quark go more often in the direction of the collision beam’s proton or antiproton? Early measures of the forward-backward asymmetry — the difference in direction between an outgoing pair of particles relative to the incoming colliding particles… More »