Complex-mass scheme and resonances in EFT
T. Bauer, D. Djukanovic, J. Gegelia, S. Scherer, L. Tiator
TL;DR
This paper discusses the complex-mass scheme's application within chiral effective field theory, specifically analyzing the pion form factor and Roper resonance magnetic moment, to handle unstable particles consistently.
Contribution
It introduces the use of the complex-mass scheme in chiral EFT for calculating properties of unstable particles like the Roper resonance.
Findings
Successful application of CMS to pion form factor in time-like region
Calculation of Roper resonance magnetic moment using CMS
Demonstration of consistency in handling unstable particles
Abstract
The complex-mass scheme (CMS) provides a consistent framework for dealing with unstable particles in quantum field theory and has been successfully applied to various loop calculations. As applications of the CMS in chiral effective field theory we consider the form factor of the pion in the time-like region and the magnetic moment of the Roper resonance.
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