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Relativistic spin sum rules and the role of the pivot

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arxiv 2103.10100 v1 pith:EZNFCAH7 submitted 2021-03-18 hep-ph nucl-th

Relativistic spin sum rules and the role of the pivot

classification hep-ph nucl-th
keywords spinpivotcenternucleonrelativisticresultsrulesangular
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Spin sum rules depend on the choice of a pivot, i.e. the point about which the angular momentun is defined, usually identified with the center of the nucleon. The latter is however not unique in a relativistic theory and has led to apparently contradictory results in the literature. Using the recently developed phase-space approach, we compute for the first time the contribution associated with the motion of the center of the nucleon, and we derive a general spin sum rule which reduces to established results after appropriate choices for the pivot and the spin component.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Transverse energy-momentum tensor distributions in polarized nucleons

    hep-ph 2026-04 unverdicted novelty 6.0

    The quantum phase-space formalism derives transverse energy-momentum tensor distributions in polarized nucleons and reproduces standard light-front distributions including bad components in the infinite-momentum frame.

  2. Relativistic energy-momentum tensor distributions in a polarized nucleon

    hep-ph 2025-03 unverdicted novelty 6.0

    Relativistic EMT distributions in polarized nucleons recover good and bad light-front components in the IMF after including polarization effects.

  3. Transverse energy-momentum tensor distributions in polarized nucleons

    hep-ph 2026-04 accept novelty 4.5

    Transverse EMT distributions in polarized nucleons are derived in the quantum phase-space formalism; they reduce to standard light-front densities (including bad components) in the infinite-momentum frame.