Collins Effect in Single Spin Asymmetries of the $p^{\uparrow }p\to \pi X$ Process

Abstract

We investigate the Collins effect in single spin asymmetries (SSAs) of the $p^{\uparrow }p\to \pi X$ process, by taking into account the transverse momentum dependence of the microscopic sub-processes cross sections, with the transverse momentum in the Collins function integrated over. We find that the asymmetries due to the Collins effect can only explain the available data at best qualitatively, by using our choices of quark distributions in the quark-diquark model and a pQCD-based analysis, together with several options of the Collins function. Our results indicate the necessity to take into account contributions from other effects such as the Sivers effect or twist-3 contributions.

arXiv comment10 LaTeX pages, 2 figures. Version in journal publication

References in corpus (25)

• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
• Transverse Polarisation of Quarks in Hadrons
• Single Transverse-Spin Asymmetries in Hadronic Pion Production
• QCD Constrains on the Shape of Polarized Quark and Gluon Distributions
• Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion Electro-Production
• Positivity Constraints for Spin-Dependent Parton Distributions
• Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV
• New Quark Distributions and Semi-Inclusive Electroproduction on Polarized Nucleons
• Single spin asymmetry for $p^{\uparrow }p\to \pi X$ in perturbative QCD
• Chiral-Odd Contribution to Single-Transverse Spin Asymmetry in Hadronic Pion Production
• Precision Measurement of the Neutron Spin Asymmetry $A_1^n$ and Spin-Flavor Decomposition in the Valence Quark Region
• Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target
• The Proton Spin and the Wigner Rotation
• Lambda polarization from unpolarized quark fragmentation
• Phenomenology of single spin asymmetries in p(transv. polarized)-p -> pion + X
• Parton intrinsic motion: suppression of the Collins mechanism for transverse single spin asymmetries in p(transv. polarised) p --> pion + X
• Fragmentation functions from semi-inclusive DIS pion production and implications for the polarized parton densities
• Azimuthal asymmetry in electro-production of neutral pions in SIDIS
• Azimuthal Spin Asymmetries of Pion Electroproduction
• Electromagnetic Form Factors of Nucleons in a Light-cone Diquark Model
• Nucleon Transversity Distribution from Azimuthal Spin Asymmetry in Pion Electroproduction
• Do we understand the single-spin asymmetry for $p{i}^0$ inclusive production in pp collisions?
• Single Hadronic-Spin Asymmetries in Weak Interaction Processes
• Mapping the Transverse Nucleon Spin

Cited by in corpus (11)

• Sivers effect in semi-inclusive deeply inelastic scattering
• Single spin asymmetries in hadron-hadron collisions
• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation
• Sivers effect in Drell Yan at RHIC
• Sivers and Collins Single Spin Asymmetries
• Left-right asymmetry in semi-inclusive deep inelastic scattering process
• Q^2 dependence of azimuthal asymmetries in semi-inclusive deep inelastic scattering and in Drell-Yan
• Mechanism of single-spin asymmetries generation in the inclusive hadron processes
• Measurement of the Transverse Single-Spin Asymmetry for Mid-rapidity Production of Neutral Pions in Polarized p+p Collisions at 200 GeV Center-of-Mass Energy
• Anti-hyperon Polarization in $pA$ and ${\Sigma }^{-}A$ Collisions and Intrinsic Antidiquark State in Incident Baryon
• Instanton induced transverse single spin asymmetry for ${\pi }^0$ production in $pp$-scattering