### 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

__for describing the angular momentum of particles.__

**two different spin observables**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

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 General***39**,
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)**