Sea Quark or Anomalous Gluon Interpretation for $g_1^p(x)$ ?
| dc.creator | Cheng, Hai-Yang | |
| dc.date | 1995-12-11 | |
| dc.date.accessioned | 2026-07-07T03:58:38Z | |
| dc.date.available | 2026-07-07T03:58:38Z | |
| dc.description | Contrary to what has been often claimed in the literature, we clarify that the hard photon-gluon cross section $\gg_{\rm hard}(x)$ in polarized deep inelastic scattering calculated in the gauge-invariant factorization scheme does {\it not} involve any soft contributions and hence it is genuinely {\it hard}. We show that the polarized proton structure function $g_1^p(x)$ up to the next-to-leading order of $α_s$ is independent of the factorization convention, e.g., the gauge-invariant or chiral-invariant scheme, chosen in defining $\gg_{\rm hard}(x)$ and the quark spin density. Thereby, it is not pertinent to keep disputing which factorization prescription is correct or superior. The hard-gluonic contribution to $Γ_1^p$, the first moment of $g_1^p(x)$, is purely factorization dependent. Nevertheless, we stress that even though hard gluons do not contribute to $Γ_1^p$ in the gauge-invariant scheme, the gluon spin component in a proton, which is factorization independent, should be large enough to perturbatively generate a negative sea polarization via the axial anomaly. We briefly comment on how to study the $Q^2$ evolution of parton spin distributions to the next-to-leading order of QCD in the chiral-invariant factorization scheme. | |
| dc.description | 11 pages | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9512267 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9512267 | |
| dc.identifier | Chin.J.Phys. 35 (1997) 25-34 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/45893 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Sea Quark or Anomalous Gluon Interpretation for $g_1^p(x)$ ? | |
| dc.type | text |