## Abstract

We have measured the spin-dependent structure function [Formula presented] in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range [Formula presented] and [Formula presented] A next-to-leading order QCD analysis is used to evolve the measured [Formula presented] to a fixed [Formula presented] The first moment of [Formula presented] at [Formula presented] is [Formula presented] (stat) [Formula presented] (syst) [Formula presented] (evol). This result is below the prediction of the Ellis-Jaffe sum rule by more than two standard deviations. The singlet axial charge [Formula presented] is found to be [Formula presented] In the Adler-Bardeen factorization scheme, [Formula presented] is required to bring ΔΣ in agreement with the quark-parton model. A combined analysis of all available proton, deuteron, and [Formula presented] data confirms the Bjorken sum rule.

Original language | English (US) |
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Pages (from-to) | 5330-5358 |

Number of pages | 29 |

Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |

Volume | 56 |

Issue number | 9 |

DOIs | |

State | Published - 1997 |

Externally published | Yes |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)