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Lifetime of the eta ' meson at low temperature
Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Physics. Uppsala University, Sweden.
Number of Authors: 3
2016 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 950, 29-63 p.Article in journal (Refereed) Published
Abstract [en]

This work constitutes one part of an investigation of the low-temperature changes of the properties of the eta ' meson. In turn these properties are strongly tied to the U(1)(A) anomaly of Quantum Chromodynamics. The final aim is to explore the interplay of the chiral anomaly and in-medium effects. We determine the lifetime of an eta ' meson being at rest in a strongly interacting medium as a function of the temperature. To have a formally well-defined low-energy limit we use in a first step Chiral Perturbation Theory for a large number of colors. We determine the pertinent scattering amplitudes in leading and next-to-leading order. In a second step we include resonances that appear in the same mass range as the eta ' meson. The resonances are introduced such that the low-energy limit remains unchanged and that they saturate the corresponding low-energy constants. This requirement fixes all coupling constants. We find that the width of the eta ' meson is significantly increased from about 200 keV in vacuum to about 10 MeV at a temperature of 120 MeV.

Place, publisher, year, edition, pages
2016. Vol. 950, 29-63 p.
Keyword [en]
Thermal field theory, Chiral symmetries, Chiral lagrangians, Large-N-c expansion
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-132050DOI: 10.1016/j.nuclphysa.2016.02.054ISI: 000376697800002OAI: oai:DiVA.org:su-132050DiVA: diva2:948944
Available from: 2016-07-14 Created: 2016-07-06 Last updated: 2016-07-14Bibliographically approved

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Niblaeus, Carl
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The Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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Nuclear Physics A
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