In their namesake “puzzle,” these particles have a higher-than-expected detection rate (-5[1])in the (-5[1])LHC Forward experiment. The Higgs boson was discovered by both the ATLAS collaboration and the Compact (10[1])Solenoid detector named for these (10[1])particles. (10[1]-5[1])An inconsistency in the (10[1])Standard Model is the 3.5-standard-deviation discrepancy between this particle’s measured and predicted (10[1]-5[1])g-factor. (10[1])By increasing the reduced mass of hydrogen, (-5[1])these particles are hypothesized to catalyze a type of cold fusion. (10[3]-5[2])The Rossi–Hall (10[1])experiment (10[1]-5[1])showed time dilation (10[2])by observing discrepancies in the 2.2-microsecond (-5[1])decay time (-5[1])of these particles (10[1])after they were produced in the atmosphere (10[1])by cosmic rays. (10[1])For 10 points, (-5[2])name this (10[1]-5[2])unstable lepton with a mass between that of the tauon and electron. (10[3])■END■ (10[7]0[11])