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η′ and η mesons with connection to anomalous glue

Steven D. Bass* and Pawel Moskal†

Steven D. Bass*

  • Kitzbühel Centre for Physics, Kitzbühel, Austria and Marian Smoluchowski Institute of Physics, Jagiellonian University, PL 30-348 Krakow, Poland

Pawel Moskal†

  • Marian Smoluchowski Institute of Physics, Jagiellonian University, PL 30-348 Krakow, Poland

  • *Steven.Bass@cern.ch
  • †P.Moskal@uj.edu.pl
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Rev. Mod. Phys. 91, 015003 – Published 15 February, 2019

DOI: https://doi.org/10.1103/RevModPhys.91.015003

Abstract

A review of the present understanding of η′ and η meson physics and these mesons as a probe of gluon dynamics in low-energy QCD is presented. Recent highlights include the production mechanism of η and η′ mesons in proton-nucleon collisions from threshold to high energy, the η′ effective mass shift in the nuclear medium, searches for possible η and η′ bound states in nuclei, as well as precision measurements of η decays as a probe of light-quark masses. Recent experimental data, theoretical interpretation of the different measurements, and the open questions and challenges for future investigation are discussed.

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Rev. Mod. Phys. 91, 015003– Published 15 February, 2019
  • Received 5 April 2018
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