Task: Text Categorization
Input (English): These particles are found in muon, tau, and electron varieties, and their existence was originally proposed to maintain conservation of energy, momentum, and angular momentum in beta decay. These particles are affected by the weak force, and devices built to examine this particle must be very large because it is notably difficult to detect. (*) For 10 points, name this subatomic particle whose name suggests that it is smaller than a neutron.
Output (English): Science