Dirac particle


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Dirac particle

[di′rak ‚pärd·ə·kəl]
(particle physics)
A particle behaving according to the Dirac theory, which describes the behavior of electrons and muons except for radiative corrections, and is envisaged as describing a central core of a hadron of spin ½ℏ which remains when the effects of nuclear forces are removed.
References in periodicals archive ?
We will establish a lagrangian that gives Dirac particle motion in the flat space limit, electromagnetism and a form for GR that gives a simple parallel between the motion of the gravitational fields, [[gamma].
in (7) and (8) refers to the Planck particles at a radius r from the stationary Dirac particle at r = 0.
Thus these coupling forces do not lead to a Dirac particle in the positron and proton cases--nor can they produce their corresponding Compton radii [r.
As is well known, electromagnetic interactions of a Dirac particle have an extraordinary experimental support.
It is well known that a self-consistent 4-current can be defined for a Dirac particle [8, see pp.
This experimental evidence, which is called the second EMC effect and also the proton spin crisis, is shown here to be an obvious result of the multi-configuration structure of states of more than one Dirac particle.
Relying on the analysis of the apparently quite simple ground state of the He atomic structure [3], it is argued here that many configurations are needed for describing a quantum me chanical state of more than one Dirac particle.
As a matter of fact, it can be proved that an elementary massive quantum mechanical particle is a spin-1/2 Dirac particle [11].
If on the other hand, the charge of the Dirac particle with spin goes to zero, the SMM again goes to zero and the interaction between the 4-vector A and the uncharged particle disappears.
The proton and electron are Dirac particles in the sense that they both possess a Compton radius and they both obey the Dirac equation, but the positive and negative charge of the proton and electron make their characteristics radically different.
The Dirac particles (proton and electron) have been discussed in a number of previous papers [1] [2] [3] [4], where it is shown that they possess similar structures.
It turns out that experimental data of all spin-1/2 Dirac particles, namely, leptons and quarks, are consistent with their pointlike attribute.