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A note on the gamma gamma->pi(0)pi(0) reaction in the 1/N expansion of chi PT

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Dobado González, Antonio and Morales, J. (1996) A note on the gamma gamma->pi(0)pi(0) reaction in the 1/N expansion of chi PT. Physics Letters B, 365 (01/04/). pp. 264-274. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/0370269395012400




Abstract

In this work we present the results of a complete calculation of the gamma gamma --> pi(0) pi(0) amplitude to leading order in the large N approximation (N being the number of Goldstone bosons) up to order m(pi)(2)/F-2, The amplitude turns to be proportional a to that of pi(+)pi(-) --> pi(0) pi(0). In spite of the fact that this factorization property cannot hold in general (as it was recently pointed our by Morgan and Penington), it appears here since in the large N limit only the I = J = 0 channel contributes to the gamma gamma --> pi(0) pi(0) reaction. Moreover it seems to be a reasonable approximation in this case since it is possible to reproduce, as a prediction, the experimental data starting from a one-parameter fit of the pi pi scattering data.


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Additional Information:

© 1996 Elsevier Science B.V..
This work has been supported in part by the Ministerio de Education y Ciencia (Spain) (CICYT AEN93- 0776) and COLCIENCIAS (Colombia). The authors thank F. Cornet, J.F. Donoghue, J. Gasser and J.R. Pelaez for useful information and discussions.

Uncontrolled Keywords:Perturbation-Theory, Collisions, Resonances, Amplitude, Sector
Subjects:Sciences > Physics
ID Code:22779
Deposited On:13 Sep 2013 15:32
Last Modified:07 Feb 2014 10:51

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