Publicación: Upper energy limit of heavy baryon chiral perturbation theory in neutral pion photoproduction
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2013-07-23
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info:eu-repo/semantics/openAccess
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Elsevier
Resumen
With the availability of the new neutral pion photoproduction from the proton data from the A2 and CB-TAPS Collaborations
at Mainz it is mandatory to revisit Heavy Baryon Chiral Perturbation Theory (HBChPT) and address the extraction of the partial
waves as well as other issues such as the value of the low-energy constants, the energy range where the calculation provides a good
agreement with the data and the impact of unitarity. We find that, within the current experimental status, HBChPT with the fitted
LECs gives a good agreement with the existing neutral pion photoproduction data up to ∼170 MeV and that imposing unitarity
does not improve this picture. Above this energy the data call for further improvement in the theory such as the explicit inclusion
of the (1232). We also find that data and multipoles can be well described up to ∼185 MeV with Taylor expansions in the partial
waves up to first order in pion energy.
Descripción
This is an Accepted Manuscript of an article published by Elsevier in "Physics Letters B, Volume724(4-5), 253-258", available at: https://doi.org/10.1016/j.physletb.2013.06.020
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Physics Letters B, Volume 724(4-5), 253-258", disponible en línea: https://doi.org/10.1016/j.physletb.2013.06.020
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Physics Letters B, Volume 724(4-5), 253-258", disponible en línea: https://doi.org/10.1016/j.physletb.2013.06.020
Categorías UNESCO
Palabras clave
chiral perturbation theory, effective field theory, pion photoproduction, heavy baryon
Citación
Fernández-Ramírez, & Bernstein. (2013). Upper energy limit of heavy baryon chiral perturbation theory in neutral pion photoproduction. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 724(4-5), 253-258. https://doi.org/10.1016/J.PHYSLETB.2013.06.020
Centro
Facultades y escuelas::Facultad de Ciencias
Departamento
Física Interdisciplinar