The role of the axial anomaly in measuring spin-dependent parton distributions

R. D. Carlitz, John C. Collins, A. H. Mueller

Research output: Contribution to journalArticle

434 Citations (Scopus)

Abstract

It is shown that forward matrix elements of j5 μ, the flavor singlet axial vector current, do not merely measure the helicity carried by quarks and antiquarks but also include a spin-dependent gluonic component due to the anomaly. In perturbation theory the exact value of the gluonic component depends on the infrared regulator, and we argue that computing off-shell matrix elements with zero-mass quarks gives the proper method of regulation to exhibit the chiral properties of the theory. We suggest measuring two-jet production in deep inelastic scattering off polarized targets as a means of determining the spin-dependent gluonic component of j5 μ.

Original languageEnglish (US)
Pages (from-to)229-236
Number of pages8
JournalPhysics Letters B
Volume214
Issue number2
DOIs
StatePublished - Nov 17 1988

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partons
anomalies
quarks
vector currents
regulators
matrices
inelastic scattering
perturbation theory

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Carlitz, R. D. ; Collins, John C. ; Mueller, A. H. / The role of the axial anomaly in measuring spin-dependent parton distributions. In: Physics Letters B. 1988 ; Vol. 214, No. 2. pp. 229-236.
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The role of the axial anomaly in measuring spin-dependent parton distributions. / Carlitz, R. D.; Collins, John C.; Mueller, A. H.

In: Physics Letters B, Vol. 214, No. 2, 17.11.1988, p. 229-236.

Research output: Contribution to journalArticle

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