This title appears in the Scientific Report :
2008
Please use the identifier:
http://hdl.handle.net/2128/3230 in citations.
Feasibility study of the $\eta' \rightarrow \pi^{+} \pi^{-} \pi^{0}$ decay using WASA-at-COSY apparatus
Feasibility study of the $\eta' \rightarrow \pi^{+} \pi^{-} \pi^{0}$ decay using WASA-at-COSY apparatus
One of the objectives of the vast physics programme of the recently comissioned WASA-at-COSY facility is the study of fundamental symmetries via the measurements of the$\eta$ and $\eta'$ mesons decays. Especially interesting are isospin violating hadronic precesses of these mesons into 3$\pi$ s...
Saved in:
Personal Name(s): | Zielinski, Marcin (Corresponding author) |
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Contributing Institute: |
Experimentelle Hadronstruktur; IKP-1 |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2008
|
Physical Description: |
69 p. |
Dissertation Note: |
Krakau, Univ., Dipl., 2008 |
Document Type: |
Diploma Thesis |
Research Program: |
Physik der Hadronen und Kerne |
Series Title: |
Berichte des Forschungszentrums Jülich
4277 |
Subject (ZB): | |
Link: |
OpenAccess |
Publikationsportal JuSER |
One of the objectives of the vast physics programme of the recently comissioned WASA-at-COSY facility is the study of fundamental symmetries via the measurements of the$\eta$ and $\eta'$ mesons decays. Especially interesting are isospin violating hadronic precesses of these mesons into 3$\pi$ systems driven by the term of QCD Lagrangian which depends on the mass difference of the u and d quarks. When an $\eta$ or an $\eta'$ meson is created in the hadronic reaction signals from such decays may be significantly obscured by the prompt production of $\pi$ mesons. In this thesis we present the estimation of the upper limit of the background due to prompt pion production for the $\eta' \rightarrow 3\pi^{0} and \eta' \rightarrow \pi^{+}\pi^{-}\pi^{0}$ decays. Using the data from proton-proton collisions measured by the COSY-11 group we have extracted differential cross sections for the multimeson production with the invariant mass corresponding to the mass of the $\eta'$ meson. Based on these results and on parametrizations of the total cross sections for the $\eta'$ meson as well as parametrization of the upper limit for the prompt $\pi^{+}\pi^{-}\pi^{0}$ production in the collisions of protons we discuss in details the feasibility of a measurement of the $\eta'$ meson decay into 3$\pi$ channels with the WASA-at-COSY facility. Based on the chiral unitary approach the value of the branching ratio BR($\eta' \rightarrow \pi^{+}\pi{-}\pi{0}$) was recently predicted to be about 1%. We show that the WASA-at-COSY has a potential to verify this result empirically. Furthermore, we discuss the possible usage of the time signals and of the energy loss measurement in the forward part of the WASA-at-COSY detector for the determination of the energy of the forward scattered charged particles. We briefly describe the detectors to be used for this purpose and introduce the computational algorithm which was developed to be applied with this technique. |