Publications about the Spin structure of Elementary Particles
The
spin structure of elementary particles has been considered a pure
quantum mechanical and relativistic property.
It is
attributed to Pauli the statement that the spin cannot be
explained classically. But what Pauli said was that “the
two-valuedness of spin is a physical property which cannot be
explained classically”, i.e., the spin of elementary particles
is quantized.
Please, see here what very
excellent quantum mechanics books say about the spin of the electron.
The spin is an angular
momentum and as such it is a mechanical property related to the
rotation invariance of the fundamental physical laws and in this
sense it has nothing to do with relativity. Any angular momentum
is a property defined with respect some fixed point and this point
has to be clearly identified. Dirac spin operator is not the
angular momentum of the particle with respect to the center of
mass. It is clear that the sum of the three spin observables
associated to the quarks cannot give the spin of the proton. We
have to add the three angular momentum observables of the quarks
with respect to their centre of masses. See the discussion
concerning the generalized use of two
different spin observables for describing the angular momentum of particles.
It is
usually stated that the electron does not rotate. We see that all
matter which surrounds us moves and rotates. According to this the
only exception are the elementary particles. It is nonsense.
The
electron has a directional property, the spin, and the associated
magnetic moment, which define a direction in space. These
properties change their orientation, and thus we associate to this
change of orientation a rotation of the electron.
What does
not change is the absolute value of the spin. It is physically
impossible to modify the value of the spin of the electron. This
has to be raised to a fundamental physical law.
Elementary
particles, if not annihilated, can never be modified its internal
structure and therefore they do not have excited states.
Papers
Kinematical
formalism of elementary spinning particles (pdf)
Lecture
Course to be given at the Center for Theoretical Physics
Jamia
Millia Islamia, New Delhi, November 2007
An
interaction Lagrangian for two spin 1/2 elementary Dirac particles (pdf)
(J.
Phys. A: Math. and Theor. 40,
2541 (2007) )
(hep-th/0702172)(abstract-arXiv)
Kinematical
theory of spinning particles: The interaction Lagrangian for two
spin 1/2 elementary Dirac particles(pdf)
Plenary
lectures of the Advanced Studies Institute, Symmetries and Spin,
Prague 19-26 July 2006.
(physics/0608089)(abstract-arXiv)
The
interaction Lagrangian of two spin 1/2 elementary Dirac
particles(pdf)
Contribution
to the Colloquium on Group Theoretical Methods on Physics CUNY
NewYork, 26-30 June 2006
The
space-time symmetry group of a spin 1/2 elementary particle
(J.
Phys. A: Math. and General39,
4291 (2006) ) (pdf)
(hep-th/0511244)(abstract-arXiv)
Kinematical
formalism of elementary spinning particles
Lecture
Course given at JINR, Dubna, 19-23 September
2005
(physics/0509131) (abstract-arXiv)
The
dynamical equation of the spinning electron
(J.
Phys. A: Math. and General, 36,
4703 (2003)) (pdf)
(physics/0112005) (abstract-arXiv)
Classical
elementary particles, spin, zitterbewegung and all that
(physics/0312107) (abstract-arXiv)
Space-time
structure of classical and quantum mechanical spin
(Czec.J.Phys. 52, C453
(2002))(pdf)
Are
the electron spin and magnetic moment parallel or antiparallel
vectors
(physics/0112057) (abstract-arXiv)
Generalized
Lagrangians and spinning particles
Contribution
to a special issue in the 200th Ostrogradskii anniversary by the
Ukrainian Mathematical Society
(Ukrainian
Math. J. 53,
1326 (2001))(pdf)
(physics/0106023)(abstract-arXiv)
A
pure kinematical explanation of the gyromagnetic ratio g=2 of
leptons and charged bosons
(Phys.
Lett. A, 257,
21 (1999) )
(in collaboration with J.M. Aguirregabiria and A.
Hernandez) (pdf)
Is
there a classical spin contribution to the tunnel effect?
(Phys.
Lett. A, 248,
279 (1998)) (pdf)
Quantization
of generalized spinning particles. New derivation of Dirac’s
equation
(J.
Math. Phys. 35,3380 (1994)) (pdf)
Classical
relativistic spinning particles
(J.
Math. Phys. 30,318
(1989)) (pdf)
Classical
particle systems: I Galilei free particle
(J.
Phys. A: Math. and General, 18,
1971 (1985) (pdf)
