Leptoproduction of J/ψ

Phys. Rev. D 57, 1846 – Published 1 February 1998
Sean Fleming and Thomas Mehen

Abstract

We study leptoproduction of J/ψ at large Q2 within the nonrelativistic QCD (NRQCD) factorization formalism. The cross section is dominated by color-octet terms that are of order αs. The color-singlet term, which is of order αs2, is shown to make a small contribution to the total cross section. We also calculate the tree diagrams for color-octet production at order αs2 in a region of phase space where there is no leading color-octet contribution. We find that in this regime the color-singlet contribution dominates. We argue that nonperturbative corrections arising from diffractive leptoproduction, higher twist effects, and higher order terms in the NRQCD velocity expansion should be suppressed as Q2 is increased. Therefore, the color-octet matrix elements O8ψ(1S0) and O8ψ(3P0) can be reliably extracted from this process. Finally, we point out that an experimental measurement of the polarization of leptoproduced J/ψ will provide an excellent test of the NRQCD factorization formalism.

DOI: http://dx.doi.org/10.1103/PhysRevD.57.1846

  • Received 17 July 1997
  • Published in the issue dated 1 February 1998

© 1998 The American Physical Society

Authors & Affiliations

Sean Fleming*

  • Department of Physics, University of Wisconsin–Madison, Madison, Wisconsin 53706

Thomas Mehen

  • Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218

  • *Present address: University of Toronto, 60 St. George St., Toronto, Ontario, CA, M5S1A7. Email address: fleming@furbaide.physics.utoronto.ca
  • Present address: California Institute of Technology, Pasadena, CA 91125. Email address: mehen@theory.caltech.edu

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