Preamble:

Types and classes of magnetic fields:

1.- The internal structural magnetic fields are born in any energy accumulation and concentration, forming any type of material particle.
They go from the nucleus or particle outwards and start out very faint and unnoticeable when the particles and their energy density are very small.
However, when they reach an important level of energy concentration (for example at the atomic level, approx. 10 ^ -30 g.), The magnetic fields developed by the nucleus or particle acquire a great potential, and together with gravity, they make rotate the nucleus forming stationary positive orbits, which attract other smaller particles to use them as orbitals and thus increase the size of the orbital system, and obtain the average energy density (Da) required by the cosmos.
Well, we will call these fields or magnetic forces structural or internal to be able to distinguish them from the others that we will see and which are leveling magnetic forces (2) between the different particles and systems.
We call these magnetic fields electromagnetic and electric fields, and they are measured by positive/negative electromagnetic charges, with which the atoms can transfer orbitals (electrons) to each other to balance in volume and energy density between them.

2.- But in addition to the structural and internal magnetic fields that produce the material particles or nuclei, there are other types of magnetic fields, which although they have the same purpose of redistribution of energy by the Cosmos, what they do is compare the energy of each particle, transfer energy from one to others, or join excess energy particles with others that lack this energy to form sets of particles with the average density of energy required.
Examples of this type of magnetic fields are varied, such as the transfer of energy in chemical reactions, the transfer of energy between particles of different temperatures, etc.
Well, these magnetic fields can also be measured by means of charges (which we could call thermal), but executed from the outside of the particles or atomic systems, and therefore sometimes we confuse these external action magnetic fields, of the electromagnetic fields of inner action.

Well, this may be the case in the positron experiment proposal.

Next, some transformation of unstable particles in stables ones, where we consider antimatter as a simple state of matter (with contrary charge only)
Large particles (more than 10^-30 grams) alone are unstable because they have excessive energy density with respect to the average that the Cosmos has (Da), for this reason their magnetic fields mark positive stationary orbits in which they are grouped forming orbital systems ( and orbital protosystems when they are small) with which they form a system of greater volume and lower density within the limits that the Cosmos establishes (Da).
In the case of the drawing the lone proton creates positive orbits to capture an electron; the neutron is already an incipient orbital system in which its orbit is occupied by smaller particles, which will form an electron with time; and the antiproton has two orbits occupied by smaller particles (which makes it negative for having much volumen and having lack of energy density) one of which must be eliminated and the other has to build its electron.

Main charges in muons

Regarding this topic of the muon, my model contemplates the three possibilities exposed in the drawing, positive (without an electron nor neutrino), neutral (with an electron or nautrino) and negative with two electrons or neutrinos.
Negative nucleus with positive orbital (positron) is not considered real by this model, due to positron acts as a neutrino o electron when act as orbital one.