A systematic phenomenological study of the $\cos 2\varphi$ asymmetry in unpolarized semi--inclusive DIS

Abstract

We study the $\cos 2\varphi$ azimuthal asymmetry in unpolarized semi-inclusive DIS, taking into account both the perturbative contribution (gluon emission and splitting) and the non perturbative effects arising from intrinsic transverse motion and transverse spin of quarks. In particular we explore the possibility to extract from $<\cos 2\varphi >$ some information about the Boer--Mulders function $h_1^{\perp }$, which represents a transverse--polarization asymmetry of quarks inside an unpolarized hadron. Predictions are presented for the HERMES, COMPASS and JLab kinematics, where $<\cos 2\varphi >$ is dominated by the kinematical higher--twist contribution, and turns to be of order of few percent. We show that a larger asymmetry in ${\pi }^{-}$ production, compared to ${\pi }^{+}$ production, would represent a signature of the Boer--Mulders effect.

14 pages, 12 figures

References in corpus (6)

• Relations between generalized and transverse momentum dependent parton distributions
• Transverse spin structure of the nucleon from lattice QCD simulations
• Transverse Quark Spin Effects and the Flavor Dependence of the Boer-Mulders Function
• Semi-Inclusive Deep Inelastic Scattering processes from small to large P_T
• Are all Boer-Mulders functions alike?
• The cos 2 phi asymmetry of Drell-Yan and J/psi production in unpolarized ppbar scattering

Cited by in corpus (16)

• Parton Fragmentation Functions
• The transverse momentum dependent distribution functions in the bag model
• 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
• Naive time-reversal odd phenomena in semi-inclusive deep-inelastic scattering from light-cone constituent quark models
• SIDIS in the target fragmentation region: polarized and transverse momentum dependent fracture functions
• Azimuthal asymmetries in unpolarized Drell-Yan processes and the Boer-Mulders distributions of antiquarks
• High-energy emissions of light mesons plus heavy flavor at the LHC and the Forward Physics Facility
• Analyzing the Boer-Mulders function within different quark models
• The next-to-leading order Higgs impact factor in the infinite top-mass limit
• A phenomenological analysis of azimuthal asymmetries in unpolarized semi-inclusive deep inelastic scattering
• Transversity and T-odd PDFs from Drell-Yan processes with $pp$, $pD$ and $DD$ collisions
• $\cos 2\varphi$ asymmetries in unpolarized semi-inclusive DIS
• Single spin asymmetry in $\pi p$ Drell-Yan process
• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD
• Flavor-dependent azimuthal modulations in unpolarized SIDIS cross section at HERMES
• Semi-inclusive processes at low and high transverse momentum