The end of the nucleon-spin crisis
| Autor: | Povh, Bogdan, Walcher, Thomas |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The small fraction of the quark polarization of the nucleon obtained in deep inelastic lepton scattering is a consequence of a wrong assumption on the flux of polarized virtual photons in the analysis of the data. The true flux of polarized photons is due to fluctuations into strongly interacting quark-antiquarks at least 20\% smaller than assumed and, therefore, the quark polarization is larger. Realizing this peculiarity the quark polarization agrees with that given by the Ellis-Jaffe sum rule, i.e. is consistent with the prediction derived from the experimentally determined weak coupling constants. It also solves the problem with the under-exhaustion of the fundamental Bjorken-sum rule. However, it has to be realized that the fluctuations render it impossible to measure the quark spin with credibility. Comment: 5 pages, 2 figures; The central point of the paper (see page 4, left column, page 4) included in the abstract. Two wordings changed in connection with the explanation of the occurrence of the correction factor. misprint: missing factor 2 has been added in eq.(6) |
| Databáze: | arXiv |
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