Neutron spin-dependent structure function, Bjorken sum rule, and first evidence for singlet contribution at low x

J. Soffer and O. V. Teryaev
Phys. Rev. D 56, 1549 – Published 1 August 1997
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Abstract

We perform the isospin decomposition of proton and neutron SLAC data for moderately low x in the region 0.01<~x<~0.1. The isovector part is well described by a power behavior xα, where α does not correspond to the intercept of a single a1 Regge trajectory, as expected. However, the observed power leads to the validity of the Bjorken sum rule and it is consistent with the power extracted from all previous data using next-to-leading order evolution. At the same time, the isoscalar behavior may be interpreted as a partial cancellation between a positive nonsinglet contribution and a strongly negative singlet one. Further experimental consequences are mentioned.

  • Received 27 August 1996

DOI:https://doi.org/10.1103/PhysRevD.56.1549

©1997 American Physical Society

Authors & Affiliations

J. Soffer

  • Centre de Physique Théorique - CNRS - Luminy, Case 907 F-13288 Marseille Cedex 9, France

O. V. Teryaev

  • Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russia

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Vol. 56, Iss. 3 — 1 August 1997

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