= Martin Lewis Perl
{c}
{tag=Physicist}
{wiki}
= Martin L. Perl
{c}
{synonym}
= M. L. Perl
{c}
{synonym}
<Martin Lewis Perl> coauthored the evidence that led to identification of the <tau lepton>. The experiment found <electron>-<muon> pairs of opposite <electric charges> in electron–positron annihilation, with missing <energy> and <momentum> and no other detected charged particles or <photons>. The distributions required additional unseen particles. Studying these unusual final states provided a route to recognizing a new unstable <lepton>, even though it decayed before leaving a directly visible track.<Evidence for Anomalous Lepton Production in e+ e- Annihilation by Martin Lewis Perl and others>[1975 abstract: mixed electron/muon events, missing energy and missing momentum]{ref}
An experimental <physicist> who led particle searches at SLAC.<Professional profile of Martin Lewis Perl>[Independent professional identity]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Martin_Perl_-_tau.jpg?width=260]
{title=Portrait of <Martin Lewis Perl>}
{description=Unknown photographer; source Fermilab (fnal.gov); existing Commons crop by Cookai1205. Public domain in the United States (US Department of Energy employee work). https://commons.wikimedia.org/wiki/File:Martin_Perl_-_tau.jpg#Licensing[Source usage terms], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Martin_Perl_-_tau.jpg}
{width=260}
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