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Prediction for eta(') -> pi+ pi- pi0 gamma signal.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The branching ratios of the radiative decays η(')→ π+π-π0γ are still unknown. Only an upper limit for η has been established and η' has not been observed. In this thesis the decays of η and η' into the final state π+π-π0γ are studied through the dominant contributions from bremsstrahlung and intermediate vector meson states respectively. Simulations have been done using ROOT, a framework based on C++ language, to determine if the decay to the final state can be observed. Based on theories describing the dominant contributions to the final state signal, event generators have been designed in this thesis to produce particle distributions for the mentioned decay branches. The process η' → ωγ, ω → π+π-π0 is 6.16±0.83 more likely than η'→ π+π-π0 decay. Probabilities for the η → π+π-π0γ contributions are presented as a function of different photon energies.

Abstract [sv]

Den bakomliggande dynamiken hos de radiativa sönderfallen η(')→ π+π-π0γ är fortfarande okänd. I nuläget finns bara en övre gräns för η och η' har ännu inte fastställts. I detta projekt studeras sönderfallen av η och η' till sluttillståndet π+π-π0γ genom de dominanta bidragen från bromsstrålning av η och ett mellantillstånd där η' först sönderfaller till ωγ och ett ytterligare sönderfall av ω till π+π-π0. Simulationer har genomförts med hjalp av ROOT, som är ett program baserat pa C++, for att avgöra om sönderfallen kan observeras. Händelsegeneratorn baseras på tidigare arbeten som beskriver sönderfallsprocesserna och resultaten presenteras i from av Dalitz-grafer. Sannolikheten for processen η' → ωγ, ω → π+π-π0 är 6.16±0.83 gånger mer trolig än η'→ π+π-π0. Sannolikheten för η → π+π-π0γ presenteras i resultatdelen av rapporten för olika energier av fotonen som avges genom bromsstrålning.

Place, publisher, year, edition, pages
2016. , 33 p.
Keyword [en]
eta, eta', pi+pi-pi0gamma
National Category
Subatomic Physics
URN: urn:nbn:se:uu:diva-296540OAI: diva2:938891
Educational program
Bachelor Programme in Physics
Available from: 2016-06-20 Created: 2016-06-17 Last updated: 2016-06-20Bibliographically approved

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