Nonvanishing tensor polarization of sea quarks in polarized deuterons
Abstract
We show how the dependence of the diffractive nuclear shadowing and of the nuclear excess of pions on the deuteron spin alignment leads to a substantial tensor polarization of sea partons in the deuteron. The corresponding tensor structure functionb_{2} (x, Q^{2}) rises towards small x and we predict the about one per cent tensor asymmetryA_{2} (x, Q^{2}) = b_{2} (x, Q^{2}) /F_{2d} (x, Q^{2}) which by almost two orders in magnitude exceeds the effect evaluated earlier in the impulse approximation. We show that the integral ƒ;^{1}_{0} dx b_{1} (x, Q^{2}) diverges, which implies that the sum rule ƒ;^{1}_{0} dx b_{1} (x, Q^{2}) = 0 suggested by Close and Kumano does not exist. We comment on the impact of tensor polarization on the determination of the vector spin structure functiong_{1d} (x, Q^{2}) for the deuteron.
 Publication:

Physics Letters B
 Pub Date:
 February 1997
 DOI:
 10.1016/S03702693(97)002505
 arXiv:
 arXiv:hepph/9611460
 Bibcode:
 1997PhLB..398..245N
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 17 pages, LaTeX, including 3 epsfigures, uses epsfigmacro, comparison with the results of ref.[36] extended