IP EMILIO SEGRE VISUAL ARCHIVES / SCIENCE PHOTO LIBRARY IP EMILIO SEGRE VISUAL ARCHIVES / SCIENCE PHOTO LIBRARY
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Martin Perl (1927-2014), US physicist. Perl is best known for his discovery of the tau lepton in a series of experiments between 1974 and 1977 at the SPEAR electron-positron collider at the Stanford Linear Accelerator Center (SLAC). The tau is a heavier version of the electron. He received a share of the 1995 Nobel Prize in Physics for this discovery. Perl was also a member of the team at SLAC headed by Burton Richter that co-discovered the J/psi particle, the first evidence of the charm quark, in 1974.
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