Leptoproduction of J/ψ

Sean P Fleming, Thomas Mehen

Research output: Contribution to journalArticle

42 Citations (Scopus)

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 α2s, is shown to make a small contribution to the total cross section. We also calculate the tree diagrams for color-octet production at order α2s 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 〈script O signψ8(1S0)〉 and 〈script O signψ8(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.

Original languageEnglish (US)
Pages (from-to)1846-1857
Number of pages12
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume57
Issue number3
StatePublished - Feb 1 1998
Externally publishedYes

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octets
color
quantum chromodynamics
factorization
Factorization
Cross section
Term
Tree diagram
formalism
cross sections
Twist
Color
Phase Space
Polarization
diagrams
Higher Order
Calculate
expansion
polarization
matrices

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Leptoproduction of J/ψ. / Fleming, Sean P; Mehen, Thomas.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 57, No. 3, 01.02.1998, p. 1846-1857.

Research output: Contribution to journalArticle

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