Single Hadronic-Spin Asymmetries in Weak Interaction Processes

Abstract

We show that measurements of single-spin asymmetries (SSAs) in charged current weak interaction processes such as deep inelastic neutrino scattering on a polarized target and inclusive $W$ production in polarized hadron-hadron collisions discriminate between the two fundamental QCD mechanisms (the Sivers and Collins effects) which have been proposed to explain such time-reversal-odd asymmetries. It has recently been shown that QCD final-state interactions due to gluon exchange between the struck quark and the proton spectators in semi-inclusive deep inelastic lepton scattering will produce non-zero Sivers-type single-spin asymmetries which survive in the Bjorken limit. We show that this QCD final-state interaction produces identical SSAs in charged and neutral current reactions. Furthermore, the contribution of each quark to the SSA from this mechanism is proportional to the contribution of that quark to the polarized baryon's anomalous magnetic moment. In contrast, the Collins effect contribution to SSAs depends on the transversity distribution of quarks in the polarized target. Since the charged current only couples to quarks of one chirality, it cannot sense the transversity distribution of the target, and thus it gives no Collins-type contribution to single-spin correlations.

12 pages, 1 figure

References in corpus (13)

• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
• Time-reversal odd distribution functions in leptoproduction
• Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
• Transverse Polarisation of Quarks in Hadrons
• Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes
• Parton Distributions in Light-Cone Gauge: Where Are the Final-State Interactions?
• Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion Electro-Production
• Structure Functions are not Parton Probabilities
• Leading asymmetries in two-hadron production in e^+e^- annihilation at the Z pole
• Transversity distributions and Drell-Yan spin asymmetries
• Mapping the Transverse Nucleon Spin
• Theoretical aspects of transversity observables

Cited by in corpus (25)

• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• Transverse Deformation of Parton Distributions and Transversity Decomposition of Angular Momentum
• Sivers Function in the MIT Bag Model
• Sivers Asymmetry and Generalized Parton Distributions in Impact Parameter Space
• Test the time-reversal modified universality of the Sivers function
• Sivers vs. Collins effect in azimuthal single spin asymmetries in pion production in SIDIS
• TMDs and SSAs in hadronic interactions
• Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking
• Single transverse spin asymmetry of dilepton production near $Z^0$ pole
• Sivers Asymmetries for Inclusive Pion and Kaon Production in Deep-Inelastic Scattering
• Transverse spin asymmetries for W-production in proton-proton collisions
• Collins effect and single spin azimuthal asymmetries in the HERMES and COMPASS experiments
• Partonic State and Single Transverse Spin Asymmetry in Drell-Yan Process
• Several Topics on Transverse Momentum-Dependent Fragmentation Functions
• Collins Effect in Single Spin Asymmetries of the $p^{\uparrow }p\to \pi X$ Process
• Charge Distributions in Transverse Coordinate Space and in Impact Parameter Space
• Spin asymmetries for vector boson production in polarized p+p collisions
• Transverse single-spin asymmetries in gauge boson production
• Single Transverse Spin Asymmetries in Semi-inclusive Deep Inelastic Scattering in a Spin-1 Diquark Model
• Predictions for the Sivers Single-Spin Asymmetry from Holographic QCD
• New Perspectives for QCD: The Novel Effects of Final-State Interactions and Near-Conformal Effective Couplings
• Transverse distortion and single-spin asymmetries for low-lying octet baryons
• Revealing chiral-odd two-meson generalized distribution amplitudes in $e^{-}{e}^{+}\to (\pi \pi )(\pi \pi )$ reactions
• Novel QCD Effects from Initial and Final State Interactions