production plane
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2019 ◽  
Vol 204 ◽  
pp. 02006 ◽  
Author(s):  
N. Ya. Ivanov ◽  
A. V. Efremov ◽  
O. V. Teryaev

In recent papers [1, 2], two new ways have been proposed to probe the linear polarization of gluons in unpolarized proton: using the azimuthal asymmetries and Callan-Gross ratio in heavy-quark pair leptoproduction, lN → l′QQ̅X. In this talk, we discuss in details the sensitivity of the QCD predictions for the azimuthal cos φ and cos 2φ asymmetries to the contribution of linearly polarized gluons inside unpolarized proton, where the azimuth φ is the angle between the lepton scattering plane (l, l′) and the heavy quark production plane (N, Q). Our analysis shows that the azimuthal distributions under consideration vary from 0 to 1 depending on the value of the gluonic counterpart of the Boer- Mulders function, $h_{1}^{ \bot g}$. We conclude that the cos φ and cos 2φ asymmetries in heavy-quark pair production in DIS processes are predicted to be large in wide kinematic ranges and sensitive to the contribution of linearly polarized gluons.


1976 ◽  
Vol 13 (5) ◽  
pp. 1150-1152
Author(s):  
C. Ezell ◽  
A. T. Laasanen ◽  
L. J. Gutay ◽  
W. N. Schreiner ◽  
P. Schübelin ◽  
...  

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