Singh, Janardan P. ; Pasupathy, J. (2009) Axial and pseudoscalar current correlators and their couplings to η and η ' mesons Physical Review D - Particles, Fields, Gravitation and Cosmology, 79 (11). 116005_1-116005_15. ISSN 1550-7998
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Official URL: http://prd.aps.org/abstract/PRD/v79/i11/e116005
Related URL: http://dx.doi.org/10.1103/PhysRevD.79.116005
Abstract
Correlators of singlet and octet axial currents, as well as anomaly and pseudoscalar densities have been studied using QCD sum rules. Several of these sum rules are used to determine the couplings fη 8, fη 0, fη'8 and fη '0. We find mutually consistent values which are also in agreement with phenomenological values obtained from data on various decay and production rates. While most of the sum rules studied by us are independent of the contributions of direct instantons and screening correction, the singlet-singlet current correlator and the anomaly-anomaly correlator improve by their inclusion.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 58064 |
Deposited On: | 31 Aug 2011 12:40 |
Last Modified: | 31 Aug 2011 12:40 |
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