On the cos 2 phi asymmetry in unpolarized leptoproduction

Abstract

We investigate the origin of the cos 2 phi azimuthal asymmetry in unpolarized semiinclusive DIS. The contributions to this asymmetry arising from the intrinsic transverse motion of quarks are explicitly evaluated, and predictions for the HERMES and COMPASS kinematic regimes are presented. We show that the effect of the leading-twist Boer-Mulders function h_1^perp(x, k_T^2), which describes a correlation between the transverse momentum and the transverse spin of quarks, is quite significant and may also account for a part of the cos 2 phi asymmetry measured by ZEUS in the perturbative domain.

11 pages, 7 figures

References in corpus (26)

• 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
• The complete tree-level result up to order $1/Q$ for polarized deep-inelastic leptoproduction
• Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
• Final state interactions and gauge invariant parton distributions
• Transverse Polarisation of Quarks in Hadrons
• QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan Processes at Low Transverse Momentum
• Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes
• First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-Inclusive Deep Inelastic Scattering
• Investigating the origins of transverse spin asymmetries at RHIC
• Modelling quark distribution and fragmentation functions
• New Quark Distributions and Semi-Inclusive Electroproduction on Polarized Nucleons
• The role of Cahn and Sivers effects in Deep Inelastic Scattering
• Bounds on transverse momentum dependent distribution and fragmentation functions
• Sivers function in a spectator model with axial-vector diquarks
• Novel Transversity Properties in Semi-Inclusive Deep Inelastic Scattering
• Sudakov suppression in azimuthal spin asymmetries
• Non-zero transversity distribution of the pion in a quark-spectator-antiquark model
• Fragmentation functions from semi-inclusive DIS pion production and implications for the polarized parton densities
• Quark correlation functions in deep inelastic semi-inclusive processes
• Measurement of Azimuthal Asymmetries in Deep Inelastic Scattering
• Evolution of transverse momentum dependent distribution and fragmentation functions
• Azimuthal asymmetry in unpolarized $\pi N$ Drell-Yan process
• Time-reversal odd distribution functions in chiral models with vector mesons

Cited by in corpus (18)

• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• The transverse momentum dependent distribution functions in the bag model
• Transverse Quark Spin Effects and the Flavor Dependence of the Boer-Mulders Function
• Intrinsic transverse parton momenta in deeply inelastic reactions
• The Boer-Mulders effect in unpolarized SIDIS: an analysis of the COMPASS and HERMES data on the $\cos 2\varphi$ asymmetry
• Semi-Inclusive Deep Inelastic Scattering processes from small to large P_T
• Transverse Spin Structure of the Nucleon through Target Single Spin Asymmetry in Semi-Inclusive Deep-Inelastic $(e,e^{\prime }{\pi }^{\pm })$ Reaction at Jefferson Lab
• A systematic phenomenological study of the $\cos 2\varphi$ asymmetry in unpolarized semi--inclusive DIS
• Naive time-reversal odd phenomena in semi-inclusive deep-inelastic scattering from light-cone constituent quark models
• Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies
• Flavor separation of the Boer-Mulders function from unpolarized ${\pi }^{-}p$ and ${\pi }^{-}D$ Drell-Yan processes
• The cos 2 phi asymmetry of Drell-Yan and J/psi production in unpolarized ppbar scattering
• $\cos 2\varphi$ asymmetries in unpolarized semi-inclusive DIS
• Measurement of azimuthal asymmetries in neutral current deep inelastic scattering at HERA
• The $\sin (2\varphi -{\varphi }_S)$ azimuthal asymmetry in the pion induced Drell-Yan process within TMD factorization
• T-odd distributions, breaking of long range correlations, and sudden entropy changes, in Drell-Yan high-energy processes
• Parton distributions and $\cos 2{\varphi }_h$ asymmetry induced by anomalous photon-quark coupling
• Measurement of azimuthal asymmetries in SIDIS on unpolarized protons