Particle physicists often search for new particles by interpreting precise measurements of a particle's behavior. One can uniquely describe a particle with good measures of several parameters. Two of these are the lifetime and mass of a particle.
One can combine measurements of an individual particle's momentum and energy to determine that particle's mass. One can also see how the lifetime of an object in the detector is coupled to the length of the track left in the detector; longer-lived particles leave longer tracks.
You will spend the next few days analyzing data from a detector at an electron-positron collider. The end result of your analysis will be defining the mass of one particle and the lifetime of another.
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