Measurement of the decay η ′ → π 0 π 0 η at MAMI
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Engineering topics
Ott, P.
Publications and source records attributed to Ott, P..
Study of η and η ′ Photoproduction at MAMI
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the ω → π 0 e + e - and η → e + e - γ Dalitz decays with the A2 setup at the Mainz Microtron
The Dalitz decays η → e + e - γ and ω → π 0 e + e - have been measured in the γp → ηp and γp → ωp reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron. The value obtained for the slope parameter of the electromagnetic transition form factor of η, Λ$-2\atop{η}$ = (1.97 ± 0.11 tot ) GeV -2 , is in good agreement with previous measurements of the η → e + e - γ and η → μ + μ - γ decays. The uncertainty obtained in the value of Λ$-2\atop{η}$ is lower than in previous results based on the η → e + e - γ decay. The value obtained for the ω slope parameter, Λ$-2\atop{ωπ^0}$ = (1.99 ± 0.21 tot ) GeV -2 , is somewhat lower than previous measurements based on ω → π 0 μ + μ - , but the results for the ω transition form factor are in better agreement with theoretical calculations, compared to earlier experiments.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Measurement of the π 0 → e + e - γ Dalitz decay at the Mainz Microtron
The Dalitz decay π 0 → e + e - γ has been measured in the γp → π 0 p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the π 0 electromagnetic transition form factor, a π = 0.030 ± 0.010 tot , is in agreement with existing measurements of this decay and with recent theoretical calculations. The uncertainty obtained in the value of a π is lower than in previous results based on the π 0 → e + e - γ decay.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Determination of the scalar polarizabilities of the proton using beam asymmetry $\Sigma_{3}$ in Compton scattering
The scalar dipole polarizabilities, α E1 and β M1 , are fundamental properties related to the internal dynamics of the nucleon. The currently accepted values of the proton polarizabilities were determined by fitting to unpolarized proton Compton scattering cross section data. The measurement of the beam asymmetry Σ 3 in a certain kinematical range provides an alternative approach to the extraction of the scalar polarizabilities. At the Mainz Microtron (MAMI) the beam asymmetry was measured for Compton scattering below pion photoproduction threshold for the first time. Finally, the results are compared with model calculations and the influence of the experimental data on the extraction of the scalar polarizabilities is determined.
73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗
Hadron polarizability data analysis: GoAT
The A2 Collaboration at the Institute for Nuclear Physics in Mainz, Germany, is working towards determining the polarizabilities of hadrons from nonperturbative quantum chromodynamics through Compton scattering experiments at low energies. The asymmetry observables are directly related to the scalar and spin polarizabilities of the hadrons. Online analysis software, which will give real-time feedback on asymmetries, efficiencies, energies, and angle distributions, has been developed. The new software is a big improvement over the existing online code and will greatly develop the quality of the acquired data.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Threshold π 0 photoproduction on transverse polarised protons at MAMI
Not Available
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Energy and time resolution of a LYSO matrix prototype for the Mu2e experiment
We have measured the performances of a LYSO crystal matrix prototype tested with electron and photon beams in the energy range 60–450 MeV. Furthermore, this study has been carried out to determine the achievable energy and time resolutions for the calorimeter of the Mu2e experiment.
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗