15 research outputs found
Transversity of quarks and nucleons in SIDIS and Drell Yan
We consider the leading and sub-leading twist -odd and even contributions
to the azimuthal asymmetry in unpolarized dilepton production in
Drell-Yan Scattering and semi-inclusive deep inelastic scattering of pions.Comment: LaTeX2e, 4 pages, 4 ps figures, uses ws-procs9x6. Contribution to the
16th International Spin Physics Symposium, SPIN2004, October 10-16, 2004,
Trieste, Ital
Transversity Properties of Quarks and Hadrons in SIDIS and Drell-Yan
We consider the leading twist -odd contributions as the dominant source of
the azimuthal and transverse single spin asymmetries in SIDIS and dilepton
production in Drell-Yan Scattering. These asymmetries contain information on
the distribution of quark transverse spin in (un)polarized protons. In the
spectator framework we estimate these asymmetries at HERMES kinematics and at
for the proposed experiments at GSI, where an anti-proton beam
is ideal for studying the transversity properties of quarks due to the
dominance of {\em valence} quark effects.Comment: 4 pages, 8 figures. To appear in the proceedings of the XIII
International Workshop on Deep Inelastic Scattering (DIS 2005, Madison
Novel Azimuthal Asymmetries in Drell Yan and Semi-inclusive Deep Inelastic Scattering
We consider the leading and sub-leading twist -odd and even contributions
to the azimuthal asymmetry in unpolarized dilepton production in
Drell-Yan Scattering. We estimate the contributions' effects at , , and energies in the framework of the
parton model using a quark diquark-spectator model of the nucleon to
approximate the soft contributions.Comment: 6 pages, 4 figure
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 and the double spin
asymmetry in polarized electroproduction of pions from an unpolarized
and transversely polarized nucleon respectively. The beam asymmetry is
expressed as the product of chiral-odd, and -odd and even distribution and
fragmentation functions. The double spin asymmetry contains information on the
quark's transversity distribution. In a quark diquark-spectator framework we
estimate these asymmetries at , , and energies.Comment: 10 pages, 4 eps figures, elsart.cls, typos corrected. To be published
in Physics Letters
A mechanism for the T-odd pion fragmentation function
We consider a simple rescattering mechanism to calculate a leading twist
-odd pion fragmentation function, a favored candidate for filtering the
transversity properties of the nucleon. We evaluate the single spin azimuthal
asymmetry for a transversely polarized target in semi-inclusive deep inelastic
scattering (for HERMES kinematics). Additionally, we calculate the double
-odd asymmetry in this framework.Comment: 6 pages revtex, 7 eps figures, references added and updated in this
published versio
Novel Transversity Properties in Semi-Inclusive Deep Inelastic Scattering
The -odd distribution functions contributing to transversity properties of
the nucleon and their role in fueling nontrivial contributions to azimuthal
asymmetries in semi-inclusive deep inelastic scattering are investigated. We
use a dynamical model to evaluate these quantities in terms of HERMES
kinematics.Comment: 5 pages revtex; 5 eps figures. References added. To appear as a Rapid
Communication in Physical Review
Flavor Dependence of T-odd PDFs
The flavor dependence of the naive time reversal odd (``T-odd'') parton
distributions for - and -quarks are explored in the spectator model. The
flavor dependence of is of significance for the analysis of the
azimuthal asymmetries in unpolarized SIDIS and DY-processes, as
well as for the overall physical understanding of the distribution of
transversely polarized quarks in unpolarized nucleons. As a by-product of the
formalism, we calculate the chiral-odd but ``T-even'' function
which enables us to present a prediction for the single spin asymmetry
for a longitudinally polarized target in SIDIS.Comment: To appear in the proceedings of 15th International Workshop on
Deep-Inelastic Scattering and Related Subjects (DIS2007), Munich, Germany,
16-20 Apr 200