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In-medium width of the η' meson
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
##### Abstract [en]

In this master’s thesis the width of the $\eta'$ meson is studied as a function of temperature. We consider a background medium consisting of a pion gas and assume a vanishing net baryon chemical potential. The width is obtained in the framework of large $N_{c}$ chiral perturbation theory and we consider terms up to next-to-leading order in the effective Lagrangian. We use a low-density approximation to calculate the width increase due to scattering with pions from the heat bath. The results suggest that the in-medium width for the $\eta'$ may become of considerable size: at a temperature $T\approx 75$ MeV we find a width increase of $\Delta\Gamma\approx 3-4$ MeV, comparable to the inverse lifetime of the fireball created in a heavy-ion collision. The $\eta'$ is of particular interested since it is intimately connected to the $U(1)_{A}$ anomaly of Quantum Chromodynamics (QCD). It has been speculated that $U(1)_{A}$ may become a symmetry of QCD at high temperatures and studies of the $\eta'$ could indicate if that is the case. Depending on for how large temperatures the results from large $N_{c}$ can be trusted, they indicate that the $\eta'$ may be possible to study experimentally in heavy-ion collisions due to its sizable in-medium width.

2013. , p. 138
##### Series
FYSAST ; FYSMAS1014
##### Keyword [en]
Eta prime meson, width, finite temperature, lifetime, QCD, chiral perturbation theory
##### Keyword [sv]
Eta prime meson, vidd, ändlig temperatur, livstid, QCD, kiral störningsteori
##### National Category
Subatomic Physics
##### Identifiers
OAI: oai:DiVA.org:uu-210687DiVA, id: diva2:664068
##### Educational program
Master Programme in Physics
##### Presentation
2013-10-31, Ångströmlaboratoriet, 14:00
##### Examiners
Available from: 2013-11-15 Created: 2013-11-13 Last updated: 2013-11-15Bibliographically approved

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Nuclear Physics
##### On the subject
Subatomic Physics

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Cite
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