PARITY DOUBLING IN PARTICLE PHYSICS

Parity doubling in excited hadrons is reviewed. Parity degeneracy in hadrons was first experimentally observed 40 years ago. Recently new experimental data on light mesons caused much excitement and renewed interest to the phenomenon, which still remains to be enigmatic. The present retrospective re...

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Bibliographic Details
Published inInternational journal of modern physics. A, Particles and fields, gravitation, cosmology Vol. 22; no. 25; pp. 4537 - 4586
Main Author AFONIN, S. S.
Format Journal Article
LanguageEnglish
Published World Scientific Publishing Company 10.10.2007
Subjects
Parity doubling
hadron symmetries
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Summary:Parity doubling in excited hadrons is reviewed. Parity degeneracy in hadrons was first experimentally observed 40 years ago. Recently new experimental data on light mesons caused much excitement and renewed interest to the phenomenon, which still remains to be enigmatic. The present retrospective review is an attempt to trace the history of parity doubling phenomenon, thus providing a kind of introduction to the subject. We begin with early approaches of 1960's (Regge theory and dynamical symmetries) and end up with the latest trends (manifestations of broader degeneracies and AdS/QCD). We show the evolution of various ideas about parity doubling. The experimental evidence for this phenomenon is scrutinized in the nonstrange sector. Some experiments of 1960's devoted to the search for missing nonstrange bosons are reexamined and it is argued that the results of these experiments are encouraging from the modern perspective.
ISSN:0217-751X
1793-656X
DOI:10.1142/S0217751X07037238