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arXiv · 1604.04310

Azimuthal Asymmetry and Ratio $R= F_L / F_T$ as Probes of the Charm Content of the Proton

N. Ya. Ivanov
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Abstract

We study two experimental ways to measure the heavy-quark content of the proton: using the Callan-Gross ratio $R(x,Q^2)=F_L/F_T$ and/or azimuthal $\cos(2\varphi)$ asymmetry in deep inelastic lepton-nucleon scattering. Our approach is based on the perturbative stability of the QCD predictions for these two quantities. We resume the mass logarithms of the type $\alpha_{s}\ln\left( Q^{2}/m^{2}\right)$ and conclude that heavy-quark densities in the nucleon can, in principle, be determined from data on the Callan-Gross ratio and/or azimuthal asymmetry. In particular, the charm content of the proton can be measured in future studies at the proposed Large Hadron-Electron (LHeC) and Electron-Ion (EIC) Colliders.

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N. Ya. Ivanov. 2016-04-14. Azimuthal Asymmetry and Ratio $R= F_L / F_T$ as Probes of the Charm Content of the Proton. https://doi.org/10.3103/s1068337212020016

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