Phys. Rev. Lett. 43, 1847–1851 (1979)Partons and Their Transverse Momenta in Quantum ChromodynamicsReceived 30 August 1979; published in the issue dated 17 December 1979 It is argued that the parton distribution function Pa/A(x,k⃗T;ζ) is well defined and useful in quantum chromodynamics. Here ζ=(2PA·n)2/(-n2) arises as a variable because of the use of the axial gauge n·A=0. An approximation for Pa/A(x,kT;ζ) is given which is obtained from an approximate solution of the Bethe-Salpeter equation in the axial-gauge ladder model. © 1979 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.43.1847
DOI:
10.1103/PhysRevLett.43.1847
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