A positivity bound for the longitudinal gluon distribution in a nucleon
J. Soffer, O. V. Teryaev
Abstract
The distribution of longitudinal gluons in a nucleon, introduced earlier by Gorsky and Ioffe, is estimated from below by making use of the positivity of density matrix and the analogue of the Wandzura-Wilczek relation for the light-cone distributions of polarized gluons in a transversely polarized nucleon.
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