APS » PROLA » Phys. Rev. Lett. » Volume 84 » Issue 11

Phys. Rev. Lett. 84, 2326 - 2329 (2000)

New Approach to Axial Coupling Constants in the QCD Sum Rule
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Tetsuo Nishikawa * and Sakae Saito †
Department of Physics, Nagoya University, Nagoya 464-8602, Japan

Yoshihiko Kondo ‡
Kokugakuin University, Tokyo 150-8440, Japan

Received 1 September 1999

We derive new QCD sum rules for the axial coupling constants by considering the correlation functions of axial-vector currents in a one-nucleon state. The QCD sum rules tell us that the axial coupling constants are expressed by nucleon matrix elements of quark-gluon composite operators which are related to the sigma terms and the moments of parton distributions. The results for the isovector axial coupling constants and the eighth component of the SU(3)f octet are in good agreement with experiment.


©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v84/p2326
DOI: 10.1103/PhysRevLett.84.2326
PACS: 12.38.Lg, 14.20.Dh

* Present address: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan. Email address: nishikawa@th.phys.titech.ac.jp
† Email address: saito@nuc-th.phys.nagoya-u.ac.jp
‡ Email address: kondo@kokugakuin.ac.jp

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