TY - JOUR
T1 - The role of the axial anomaly in measuring spin-dependent parton distributions
AU - Carlitz, R. D.
AU - Collins, J. C.
AU - Mueller, A. H.
PY - 1988/11/17
Y1 - 1988/11/17
N2 - It is shown that forward matrix elements of j5μ, 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 j5μ.
AB - It is shown that forward matrix elements of j5μ, 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 j5μ.
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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 -