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Unitarity and gamma-gamma-]pi-pi in chiral perturbation-theory



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Dobado González, Antonio and Peláez Sagredo, José Ramón (1993) Unitarity and gamma-gamma-]pi-pi in chiral perturbation-theory. Zeitschrift Fur Physik C-Particles and Fields, 57 (3). pp. 501-510. ISSN 0170-9739

Official URL: http://dx.doi.org/10.1007/BF01474345


The direct chiral perturbation theory (ChPT) one-loop prediction for the production of two pions from two photons is compared with the recent Crystal Ball experimental data. The one-loop computation does not fit data even close to threshold because unitarity effects are important even at very low energies. However, when the constraints coming from unitarity and analyticity are included in a suitable way, the range of application of one-loop ChPT can be largely extended in agreement with the experiment.

Item Type:Article
Uncontrolled Keywords:Physics, Particles and Fields
Subjects:Sciences > Physics
ID Code:22862
Deposited On:18 Sep 2013 17:15
Last Modified:12 Nov 2014 13:03

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