Duality in semi-inclusive pion electroproduction

Azimuthal Asymmetries in Inclusive Single Pion Electroproduction

The leading and sub-leading order results for pion electroproduction in polarized and unpolarized semi-inclusive deep-inelastic scattering, are considered putting emphasis on transverse momentum dependent effects appearing in azimuthal asymmetries. In particular the spin-dependent (single, double) and spin-independent asymmetries of the distributions in the azimuthal angle φ of the pion related...

Drell - Yan Scaling in Semi - Inclusive Electroproduction ”

The scaling behavior of deep inelastic single-particle inclusive electroproduction (or neutrino production) expected from the parton model has been given by Drell and Yan as v 3 g&2 when the observed hadron has a finite fraction of the virtual photon’s laboratory momentum. Although Drell and Yan give the correct scaling behavior with their choice of variables, we show that with variables more a...

Single target - spin asymmetries in semi - inclusive pion electroproduction on longitudinally polarized protons ∗

Chiral-odd Fragmentation Functions in Single Pion Inclusive Electroproduction

We consider a sub-leading twist chiral-odd pion fragmentation function and explore its contribution in single pion semi-inclusive electroproduction. We evaluate the single beam-spin azimuthal asymmetry ALU and the double spin asymmetry ALT in polarized electroproduction of pions from an unpolarized and transversely polarized nucleon respectively. The beam asymmetry is expressed as the product o...

Transversity Distribution and Polarized Fragmentation Function from Semi-inclusive Pion Electroproduction

A method is discussed to determine the hitherto unknown u-quark transversity distribution δu(x) from a planned HERMES measurement of a single target-spin asymmetry in semi-inclusive pion electroproduction off a transversely polarized target. Assuming u-quark dominance, the measurement yields the shapes of the transversity distribution δu(x) and of the ratio H 1 (z)/D u 1 (z), of polarized and u...