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 language | English (US) |
|---|---|
| Pages (from-to) | 229-236 |
| Number of pages | 8 |
| Journal | Physics Letters B |
| Volume | 214 |
| Issue number | 2 |
| DOIs | |
| State | Published - Nov 17 1988 |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
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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 journal › Article
TY - JOUR
T1 - The role of the axial anomaly in measuring spin-dependent parton distributions
AU - Carlitz, R. D.
AU - Collins, John C.
AU - Mueller, A. H.
PY - 1988/11/17
Y1 - 1988/11/17
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0000370430&partnerID=8YFLogxK
U2 - 10.1016/0370-2693(88)91474-8
DO - 10.1016/0370-2693(88)91474-8
M3 - Article
AN - SCOPUS:0000370430
VL - 214
SP - 229
EP - 236
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 2
ER -