Dispersion relations for γ ∗ γ ∗ → ππ: helicity amplitudes, subtractions, and anomalous thresholds

Dispersion relations for γ ∗ γ ∗ → ππ: helicity amplitudes, subtractions, and anomalous thresholds

Abstract We present a comprehensive analysis of the dispersion relations for the doubly-virtual process γ ∗ γ ∗ → ππ. Starting from the Bardeen-Tung-Tarrach amplitudes, we first derive the kernel functions that define the system of Roy-Steiner equations for the partial-wave helicity amplitudes. We t...

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Bibliographic Details
Main Authors: Martin Hoferichter, Peter Stoffer
Format: Article
Language:English
Published: SpringerOpen 2019-07-01
Series:Journal of High Energy Physics
Subjects:
Chiral Lagrangians
Effective Field Theories
Nonperturbative Effects
Precision QED
Online Access:http://link.springer.com/article/10.1007/JHEP07(2019)073

Internet

http://link.springer.com/article/10.1007/JHEP07(2019)073

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