Talk:PlanetPhysics/Tau

Original TeX Content from PlanetPhysics Archive
%%% This file is part of PlanetPhysics snapshot of 2011-09-01 %%% Primary Title: Tau %%% Primary Category Code: 14.60.Fg %%% Filename: Tau.tex %%% Version: 2 %%% Owner: metalac %%% Author(s): metalac %%% PlanetPhysics is released under the GNU Free Documentation License. %%% You should have received a file called fdl.txt along with this file. %%% If not, please write to gnu@gnu.org. \documentclass[12pt]{article} \pagestyle{empty} \setlength{\paperwidth}{8.5in} \setlength{\paperheight}{11in}

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Tau is a \htmladdnormallink{lepton}{http://planetphysics.us/encyclopedia/Lepton.html} just like electron and \htmladdnormallink{Muon}{http://planetphysics.us/encyclopedia/MuonLepton.html}. It is considered to be a point-like \htmladdnormallink{particle}{http://planetphysics.us/encyclopedia/Particle.html} since it doesn't have internal structure, as far as it's known. Taus have a \htmladdnormallink{mass}{http://planetphysics.us/encyclopedia/CosmologicalConstant.html} of 1777 MeV which is about 3500 times more than an electron. They are also twice as heavy as protons. Being so massive meant that they were not easily discoverable because \htmladdnormallink{energies}{http://planetphysics.us/encyclopedia/CosmologicalConstant.html} of 1.7 GeV or greater were needed. Finally in experiments that ran in 1974-7, some 40 years after discovery of muon, taus were discovered by a \htmladdnormallink{group}{http://planetphysics.us/encyclopedia/TrivialGroupoid.html} of experimentalists at \htmladdnormallink{SLAC}{http://planetphysics.us/encyclopedia/CosmologicalConstant2.html}.

Taus are able to decay into \htmladdnormallink{hadrons}{http://planetphysics.us/encyclopedia/QuarkAntiquarkPair.html} via \htmladdnormallink{weak interaction}{http://planetphysics.us/encyclopedia/WeakNuclearForce.html}, and this makes them unique in the leptonic world. Taus are very unstable, thus they have a very short lifetime of $3 \cdot 10^{-13}$s

As a member of the 3rd leptonic group taus have an anti-particle partner anti-tau, and also two neutrinos, a tau \htmladdnormallink{Neutrino}{http://planetphysics.us/encyclopedia/Neutrino.html} and anti-tau neutrino.

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