Hadron polarization in semi-inclusive reactions involving photons

Spin Polarization of Hyperons in the Hadron-hadron Inclusive Collisions

The high energy hadron-hadron collisions produce various hyperons, in which large spin polarizations perpendicular to a production plane are observed at high Feynman-x (xF ) and low transverse momentum pT . For these collisions, we have proposed a global model on the basis of quark rearrangements concept. In order to produce a final state hyperon at high xF , we consider possible rearrangement ...

Transverse Λ Polarization in Semi-inclusive Dis

Extending a previous description of Λ and Λ̄ polarization in unpolarized p -p interactions, within a pQCD factorization scheme with new polarizing fragmentation functions, we give predictions for the transverse polarization of Λ’s and Λ̄’s in semi-inclusive DIS, both with neutral and charged currents. Comparison with existing data is not yet significant, but more experimental results are expected...

Semi-inclusive Hadron-hadron Transverse Spin Asymmetries and Their Implication for Polarized Dis

We discuss 1 a possible explanation of the 25 year old mystery of the large transverse spin asymmetries found in many semi-inclusive hadron-hadron reactions. We obtain the first reliable information about the transverse polarized quark densities ∆T q(x) and we find surprising implications for the usual, longitudinal, polarized DIS. The plan of the presentation is as follows: 1) A brief reminder...

Inclusive Lepton-hadron Experiments

η decays involving photons ∗

The decays of the η meson are reviewed in the framework of Chiral Perturbation Theory. Particular attention is devoted to the electromagnetic channels involving photons, either in the final or intermediate states.