Azimuthal Asymmetries in DIS as a Probe of Intrinsic Charm Content of the Proton

Abstract

We calculate the azimuthal dependence of the heavy-quark-initiated $\mathcal{O}({\alpha }_s)$ contributions to the lepton-nucleon deep inelastic scattering (DIS). It is shown that, contrary to the photon-gluon fusion (GF) component, the photon-quark scattering (QS) mechanism is practically $\cos 2\varphi$-independent. We investigate the possibility to discriminate experimentally between the GF and QS contributions using their strongly different azimuthal distributions. Our analysis shows that the GF and QS predictions for the azimuthal $\cos 2\varphi$ asymmetry are quantitatively well defined in the fixed flavor number scheme: they are stable, both parametrically and perturbatively. We conclude that measurements of the azimuthal distributions at large Bjorken $x$ could directly probe the intrinsic charm content of the proton. As to the variable flavor number schemes, the charm densities of the recent CTEQ and MRST sets of parton distributions have a dramatic impact on the $\cos 2\varphi$ asymmetry in the whole region of $x$ and, for this reason, can easily be measured.

arXiv comment22 pages, 8 figures, revtex4

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• How to measure the linear polarization of gluons in unpolarized proton using the heavy-quark pair leptoproduction
• Azimuthal Dependence of the Heavy Quark Initiated Contributions to DIS
• QCD predictions for the azimuthal asymmetry in charm leptoproduction for the COMPASS kinematics
• The impact of intrinsic charm on the parton distribution functions
• The uncertainty of parton distribution functions due to physical observables in a global analysis
• How to measure the linear polarization of gluons in unpolarized proton using the heavy-quark pair production
• Spin Effects in Quantum Chromodynamics and Recurrence Lattices with Multi-Site Exchanges
• Azimuthal Asymmetry and Ratio $R=F_L/F_T$ as Probes of the Charm Content of the Proton
• Perturbative stability of the QCD predictions for the ratio $R=F_L/F_T$ and azimuthal asymmetry in heavy-quark leptoproduction