I Does a particle's mass fluctuate.

[maximdogger]

Is a particle's mass at minimum when viewed at maximum PEP of the wave form;
and is the particle's mass at maximum when viewed at minimum PEP? ( vis e=mc2 )

 

[malawi_glenn]

PEP?

 

[maximdogger]

sine wave Peak Envelope Power.

 

[weirdoguy]

No.

 

[malawi_glenn]

No idea what "when viewed" means.

There is however a concept of mass width in QFT for unstable particles.

 

[maximdogger]

thanks ..I will look up mass width.

 

[malawi_glenn]

thanks ..I will look up mass width.

It is actually called "decay width".
This means that if you were to colled say two photons emerging from the decay of the Higgs boson. Even if you have 100% perfect dectors and instrumentation, you will still see the invariant mass of these two photons as a distribution peaking around the higgs boson mass. In some sense, this can be interpreted as "mass width"

 

[vanhees71]

No idea what "when viewed" means.

There is however a concept of mass width in QFT for unstable particles.

The mass of an "unstable particle" (or more accurately a resonance) is a well-defined number. It's given by the complex pole of its Green's function in (four-)momentum space, i.e., the real part of this pole is the mass and the imaginary part is its decay width, i.e., the inverse mean lifetime.

 

[Demystifier]

No, but the mass of "unparticle" fluctuates.
https://arxiv.org/abs/0801.4471

 

[malawi_glenn]

The mass of an "unstable particle" (or more accurately a resonance) is a well-defined number. It's given by the complex pole of its Green's function in (four-)momentum space, i.e., the real part of this pole is the mass and the imaginary part is its decay width, i.e., the inverse mean lifetime.

Yup.
That is how mass can be defined for particles in qft.

 

[malawi_glenn]

No, but the mass of "unparticle" fluctuates.
https://arxiv.org/abs/0801.4471

I used that paper when I was starting my phd hehe