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Physics
High Energy, Nuclear, Particle Physics
Pole mass and non stationary mass of a particle
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[QUOTE="Reggid, post: 6606126, member: 654378"] I don't think that the term "characteristic mass" has a defined meaning in this context. But for non-colored particles the pole mass represents - by definition - the pole of the free particle propagator. So yes, that is what you might call the physical observable mass of that particle. For quarks the situation is in fact different, because they carry color charge and are subject to confinement. So the concept of a free particle propagator does not make sense, because there are no free quarks to beginn with. And indeed it turns out that the propagator of a colored particle does not have a pole, due to non-perturbative effects. You can still define a particular mass scheme that we call the "pole mass" also for quarks, by just doing the equivalent subtractions in the renormalization procdure as you would for the pole mass for non-colored particles, but in this case it is not more physical than any other scheme you might choose, because that interpretation of the mass as the pole of the free particle propagator is anyways lost. For the top quark in some measurements the pole mass is used, in other measurments other mass schemes are used. For the other quarks you will usually not see results in terms of the pole mass (it just does not make a lot of sense for them, due to an intrinsic renormalon ambiguity in the definition of the pole mass for quarks that becomes more and more relevant the lighter the quark is). Results for the masses of the other quarks are usually qutoted in the MSbar scheme. [/QUOTE]
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High Energy, Nuclear, Particle Physics
Pole mass and non stationary mass of a particle
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