Probing the linearly polarized gluons in unpolarized proton with heavy-quark pair production
| Autor: | Oleg Teryaev, A.V. Efremov, N. Ya. Ivanov |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Quark History Proton Linear polarization Nuclear Theory High Energy Physics::Phenomenology FOS: Physical sciences Computer Science Applications Education Gluon Azimuth Nuclear physics High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Pair production Proton spin crisis High Energy Physics::Experiment Nucleon Nuclear Experiment |
| Popis: | We consider the azimuthal $\cos \varphi$ and $\cos 2\varphi$ distributions and the Callan-Gross ratio $R={\rm d}\sigma_L/{\rm d}\sigma_T$ in heavy-quark pair electroproduction, $lN\rightarrow l^{\prime}Q\bar{Q}X$, as probes of linearly polarized gluons in unpolarized nucleons. Our analysis shows that the azimuthal asymmetries and Callan-Gross ratio are predicted to be large and very sensitive to the contribution of the gluonic counterpart of the Boer-Mulders function, $h_{1}^{\perp g}$, describing the linear polarization of gluons inside unpolarized nucleon. In particular, the maximum values of the azimuthal distributions vary from 0 to 1 depending on $h_{1}^{\perp g}$. We conclude that future measurements of these quantities at the proposed EIC and LHeC colliders could clarify in details the proton spin decomposition puzzle. Comment: 4 pages, 4 figures, talk given at the XVIII Workshop on High Energy Spin Physics (DSPIN-19), September 2-6, Dubna |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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