We present a calculation of the proton momentum and angular decompositions using overlap fermions on $2+1$-flavor RBC/UKQCD domain-wall lattice at 0.143 fm with pion mass 171 MeV which is close to physical one. A complete determination fractions carried by up, down, strange, glue inside has been done valence masses varying from 391 MeV. have utilized fast Fourier transform stochastic-sandwich m...

We present the Poincaré algebra interpolating between instant and lightfront time quantizations. The angular momentum operators satisfying SU(2) algebra are constructed in an arbitrary interpolation angle and shown to be identical to the ordinary angular momentum and Leutwyler-Stern angular momentum in the instant and light-front quantization limits, respectively. The exchange of the dynamical ...

We present an introduction to the orbital angular momentum of light for use in optics instruction. This type of angular momentum is a new fundamental concept discovered fifteen years ago. It arises in optical beams with helical wave-fronts. We introduce it as part of a fundamental discussion of the momentum of light. We also present inexpensive demonstrations of transfer of linear and angular m...

We elucidate the paraxial orbital angular momentum of entangled photon pairs generated by spontaneous parametric downconversion in different noncollinear geometries in which the entangled photons counterpropagate. We find, in particular, the orbital angular momentum of entangled pairs generated in transverse-emitting configurations, in which none of the known rules for selecting orbital angular...

We quantize the angular momentum of the electromagnetic field in a linear medium. We consider the interaction of an atom with an evanescent wave. We discuss the transfer of angular momentum in such a wave in relation to some recent experiments.

he electron is a remarkably simple particle of matter. It has mass T and an electric charge; it spins (or seems to spin) with a b e d amount of angular momentum, and it has a magnetic moment, so that an external magnetic field exerts a twisting force on it. These four quantities constitute all the known properties of the electron; once their values have been established there is nothing more to...

1 Problem In view of recent interest in orbital angular momentum modes in optical fibers, 1 discuss angular momentum in the modes of a circular waveguide of radius a, with perfectly conducting walls and filled with a medium of index of refraction n. 2 Solution Circular-waveguide modes were first discussed in 1893 by J.J. Thomson in sec. 300 of [2] and then by Rayleigh in 1897 [3]. 2 Although th...