Supersymmetry theory proposes that the super partners of the existing bosons and fermions are extinguished through some symmetry breaking mechanism… though there are some articles that offers few or no exotic particles other than the SM particles, but it would also be the case (in the theoretical model) that the symmetry breaking may cause polarization either only towards bosons or fermions… if not, why/how nature would choose which fermions and bosons among the super particles are to survive? Further, is it at least theoretically possible that the existing bosons and fermions have their super partners within the observed fermions and bosons? I do understand that in the second proposal the constraint of equal mass will be violated.
Supersymmetry isn't a theory-it's a symmetry, that has implications for any theory of matter. If it were a symmetry of the Standard Model, it would imply the existence of new particles, that would have the same mass and charges (electric, weak, strong=color) as the known particles; but have different spin, in a very specific relation to the spin of the known particles. This relation implies that, for each ``known'' particle, there would be a ``partner''; hence the ``doubling''.
So the answer to the main question is Yes.
The text, however, is so full of confused statements, that they can't be addressed in any meaningful way.
It isn't known, for the moment how supersymmetry is realized (or broken) for the Standard Model.
The assumption is made, that, since particles of the same mass and charge as the known particles, but of different spin, aren't observed, supersymmetry must be ``broken''. How this is accomplished, however, isn't known. The ``easiest'' ways to describe this ``breaking'' don't seem to be consistent with experimental measurements.
Contrary to what is believed, there is, still, a lot that's not understood about supersymmetry and a theoretical understanding (that's not limited to the Standard Model itself) is prerequisite to model building.
Supersymmetry isn't simply of relevance to models of particle physics.
So far, the Supersymmetry has not been very succsesful in physics. However, mathematically, it is a very beautiful subject, which may explain why it stood so long with theoretical physics.
(super)symmetry has its limits in broken symmetries (which probably are not symmetrically)
Again, the suersymmetry time has not come yet. Newer the less, despite meager results, its methodology in one of these days may be very useful in other disciplines.
perfect symmetry does exist merely in mathematics, not in nature, so it is right to say that su(P)ersymmetry has not come yet., while maths is so perfect that nature cannot match it. maybe at zero kelvin one can(not) see that it was (not so :))
N=1 supersymmetry doubles particle content of standard model, In N=2 supersymmetry particle and superparticle both will have N=2 superpartners, that will make four copies of original particle content. Similarly one can think of N=4 supersymmetry (16 copies) and N=8 supersymmetry (32 copies). N=8 is maximum number of supersymmetries essentially because graviton is a spin 2 particle and because there are 8 half steps from 2 to -2.
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