Comment on “Noncommutation of Pauli spin operators in neutron polarimetry” by Y. Hasegawa et al

I place the work of Hasegawa et al. [Phys. Lett. A 234 (1997) 322] in the proper perspective.     

Comment on “Solitons in the Heimburg–Jackson model of sound propagation in lipid bilayers are enabled by dispersion of a stiff membrane” by M. Drab et al.

The European Physical Journal E - Inference problems for two-dimensional snapshots of rotating turbulent flows are studied. We perform a systematic quantitative benchmark of point-wise and...     

Reply to the Comment by A.W. Thomas et al. on “The role of the orbital angular momentum in the proton spin”

The orbital angular momenta L^u and L^d of up- and down-quarks in the proton are estimated as functions of the energy scale as model independently as possible on the basis of Ji's angular-momentum sum rule. This analysis indicates that L ^u - L ^d is large and negative even at the low energy scale of nonperturbative QCD, in contrast to Thomas' similar analysis based on the refined cloudy bag model. We pursuit the origin of this apparent discrepancy and suggest that it may have a connection with the fundamental question of how to define quark orbital angular momenta in QCD.