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.

arXiv comment14 pages, 12 figures

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Cited by in corpus (38)

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• The transverse momentum dependent distribution functions in the bag model
• 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
• Azimuthal distributions of charged hadrons, pions, and kaons produced in deep-inelastic scattering off unpolarized protons and deuterons
• Sivers and Boer-Mulders functions in Light-Cone Quark Models
• Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons
• Measurement of unpolarized semi-inclusive pi+ electroproduction off the proton
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• Naive time-reversal odd phenomena in semi-inclusive deep-inelastic scattering from light-cone constituent quark models
• Final state interactions and the transverse structure of the pion using non-perturbative eikonal methods
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• $\cos 2\varphi$ asymmetries in unpolarized semi-inclusive DIS
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• Azimuthal asymmetries in the unpolarized SIDIS cross section at COMPASS
• Single spin asymmetry in $\pi p$ Drell-Yan process
• Tests of the extraction of the Sivers, Boer-Mulders and transversity distributions in SIDIS reactions
• New study of the Boer-Mulders function: Implications for the quark and hadron transverse momenta
• Three dimensional imaging of the nucleon --- TMD (theory and phenomenology)
• Transversity Asymmetries
• Consistency tests for the extraction of the Boer-Mulders and Sivers functions
• T-odd proton-helicity asymmetry in semi-inclusive DIS in perturbative QCD
• Transverse Spin Physics at COMPASS
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• Semi-inclusive processes at low and high transverse momentum