antimuon

However, the production of a muon/antimuon bound state, which is an onium, has been theorized.

The exotic atom consisting of a muon and an antimuon is known as "true muonium".

Its name has been condensed to muon and, of course, just as there is an antielectron, so is there an antimuon.

The two tauons then decay into an electron or a positron, a muon or an antimuon, and four of the various neutrinos.

What if the tau decays to produce a muon and the antitau decays to produce an antimuon?

Like all elementary particles, the muon has a corresponding antiparticle of opposite charge (+1 e) but equal mass and spin: the antimuon (also called a positive muon).

The hyperfine splitting in muonium, an "atom" consisting of an electron and an antimuon, provides a more precise measurement of α because the muon has no internal structure:

Pair production is the creation of an elementary particle and its antiparticle, for example creating an electron and positron, a muon and antimuon, or a proton and antiproton.

The MEG experiment at the Paul Scherrer Institute near Zurich will search for a similar process, in which an antimuon decays to a photon and an antielectron.

And places where the spouts once were are going to look much the same, except for very specific muon and antimuon decays-- assuming we can catch any of the particles in question decaying.

The cannon emits a beam of polaron particles, the fictional in-universe antimatter counterpart of the muon (not to be confused with the actual polaron or the actual antimuon).

Hence Perl and his coworkers did not detect the tau directly, but rather discovered anomalous events where they detected either an electron and a muon, or a positron and an antimuon:

The E821 experiment at Brookhaven National Laboratory (BNL) studied the precession of muon and antimuon in a constant external magnetic field as they circulated in a confining storage ring.

Muonium, despite its name, is not an onium containing a muon and an antimuon, because IUPAC assigned that name to the system of an antimuon bound with an electron.

The researchers pulled out those events that included a J/ψ and a pair of π particles (another type of meson), with the J/ψ being spotted due to its decay either into an electron and positron, or a muon and antimuon.