Pekka Sinervo

This plot shows the mjet1 versus mjet2 distribution for the data taken in this experiment. At CDF, protons of energy 1 TeV, or 1 trillion electronvolts, collided with antiprotons of equal energy. In many of these events, we observe a phenomenon called a jet. A jet is a spray of particles all moving in the same direction and typically originating from a practically massless subatomic particle, which is why it is also expected to have a low mass. It is…