Lifetime of the eta’ meson at low temperature
2016 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. A950, 29-63 p.Article in journal (Refereed) PublishedText
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. A950, 29-63 p.
IdentifiersURN: urn:nbn:se:uu:diva-286841DOI: 10.1016/j.nuclphysa.2016.02.054ISI: 000376697800002OAI: oai:DiVA.org:uu-286841DiVA: diva2:922070