Answer
antiparticle
Work Step by Step
$\overline{\nu}_{\tau}$ is the symbol for the antiparticle of a Tau neutrino.
The horizontal line above the symbol for $\nu$ shows that it is an antiparticle.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 44 - Quarks, Leptons, and the Big Bang - Questions - Page 1363: 11b
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