Il Nuovo Cimento A (1965-1970)

, Volume 53, Issue 1, pp 107–114 | Cite as

Low-energy theorem connecting weak-pion production and two-pion photo-production

  • P. Narayanaswamy
  • B. Renner


\(({\mathcal{N}}*\pi )\) photo-production from nucleons is connected to the matrix elements of the weak axial current between nucleons and\({\mathcal{N}}*(1236)\) states as a low-energy theorem by current algebras. Using predictions for these matrix elements, partly again from current algebras, the threshold cross-section of\(\gamma {\mathcal{N}} \to \pi {\mathcal{N}} * \) is worked out, so providing a possible consistency test.


Matrix Element Current Algebra Born Term Teorema Axial Form Factor 
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Теорема, связывающая слабое пионное рождение при низких энергиях с двух-пионным фоторождением


\(({\mathcal{N}}*\pi )\)-\qF\qo\qt\qo\qr\qo\Qz\qd\ye\qn\qi\ye на нуклонах связывается с матричными элементами слабого аксиального тока между нуклонами и\({\mathcal{N}}*(1236)\) состояниями, как теорема при низких энергиях, посредством алгебр токов. Используя предсказания для этих матричных элементов, частично из алгебр токов, разрабатывается пороговое поперечное сечение\(\gamma {\mathcal{N}} \to \pi {\mathcal{N}} * \), обеспечивая возможную согласованную проверку.


Si collega la fotoproduzione di\(({\mathcal{N}}*\pi )\) da nucleoni con gli elementi di matrice della corrente assiale debole fra nucleoni e stati di\({\mathcal{N}}*(1236)\) come un teorema per le basse energie è collegato all'algebra delle correnti. Si ricava il limite di soglia della sezione d'urto per\(\gamma {\mathcal{N}} \to \pi {\mathcal{N}} * \) in base ad alcune previsioni su gli elementi di matrice, in parte ancora derivate dall'algebra delle correnti, formando così un possibile test di coerenza.


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Copyright information

© Società Italiana di Fisica 1968

Authors and Affiliations

  • P. Narayanaswamy
    • 1
  • B. Renner
    • 1
  1. 1.CERNGeneva

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