In-medium width of the η' meson
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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.
Eta prime meson, width, finite temperature, lifetime, QCD, chiral perturbation theory
Eta prime meson, vidd, ändlig temperatur, livstid, QCD, kiral störningsteori
IdentifiersURN: urn:nbn:se:uu:diva-210687OAI: oai:DiVA.org:uu-210687DiVA: diva2:664068
Master Programme in Physics
2013-10-31, Ångströmlaboratoriet, 14:00
Leupold, Stefan, Professor