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We study the azimuthal cosφ and cos2φ asymmetries in heavy-quark pair leptoproduction, lN→l′QQ¯X, as probes 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). First, we determine the maximal values for the cosφ and cos2φ asymmetries allowed by the photon–gluon fusion with...
Perturbative calculations of the static QCD potential have the u=3/2 renormalon uncertainty. In the multipole expansion performed within pNRQCD, this uncertainty at LO is known to get canceled against the ultrasoft correction at NLO. To investigate the net contribution remaining after this renormalon cancellation, we propose a formulation to separate the ultrasoft correction into renormalon uncertainties...
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