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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  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  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  may become of considerable size: at a temperature  MeV we find a width increase of  MeV, comparable to the inverse lifetime of the fireball created in a heavy-ion collision. The  is of particular interested since it is intimately connected to the anomaly of Quantum Chromodynamics (QCD). It has been speculated that  may become a symmetry of QCD at high temperatures and studies of the  could indicate if that is the case. Depending on for how large temperatures the results from large  can be trusted, they indicate that the  may be possible to study experimentally in heavy-ion collisions due to its sizable in-medium width.

Place, publisher, year, edition, pages
2013. , 138 p.
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
URN: urn:nbn:se:uu:diva-210687OAI: oai:DiVA.org:uu-210687DiVA: diva2:664068
Educational program
Master Programme in Physics
Presentation
2013-10-31, Ångströmlaboratoriet, 14:00
Supervisors
Examiners
Available from: 2013-11-15 Created: 2013-11-13 Last updated: 2013-11-15Bibliographically approved

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