Conveners
Tuesday Parallel Session: Few-body systems (Atrium Maximum)
- Luca Doria (Johannes Gutenberg University Mainz)
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Harald Merkel (Johannes Gutenberg University)01/08/2023, 16:30Invited Talk
In this presentation, a new measurement of the monopole transition form factor of the ground state to the first exited state of the alpha-particle will be presented [1]. The precision of the measurement exceeds significant the precision of existing data sets and allows for the determination of two coefficients in a low energy expansion.
The result are confronted with state-of-the art...
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Gerald Feldman (George Washington University)01/08/2023, 16:55Contributed Talk
The High Intensity Gamma-Ray Source (HIGS) at Duke University delivers monoenergetic photon beams with high linear or circular polarization by backscattering of free-electron laser (FEL) photons [1]. To exploit the unique capabilities of this facility, we are conducting an ambitious program of Compton scattering studies on light nuclei aimed at determining the nucleon electromagnetic...
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Alejandro Kievsky (INFN)01/08/2023, 17:10Contributed Talk
The p-p-p correlation function is defined as
$$C_{123} (Q) = \int \rho^5 d\rho\,d\Omega\, S_{123}|\Psi_s|^2$$ where $\rho,\Omega$ are the hyperspherical coordinates and $\hbar^2Q^2/M$ is the total energy of the system. The source is represented by a gaussian hypercentral profile $$S_{123}=\frac{1}{\pi^3\rho_0^6}e^{-\rho^2/\rho_0^2}$$ The three-proton wave function, $\Psi_s$, is...
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Lucas Happ (RIKEN, Nishina Center, "Few-body Systems in Physics" Laboratory)01/08/2023, 17:25Contributed Talk
We theoretically study the lifetimes of three-body resonance (quasi-bound) states. In particular, we are interested in how these lifetimes vary between one-dimensional and three-dimensional geometries. As an example, we consider a two-component three-body system with short-range pair-interactions that support several two-body bound states. Three-body resonance states are discrete eigenstates...
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Dr Ashot Gasparyan (Ruhr University Bochum)01/08/2023, 17:40Contributed Talk
An important feature of an effective field theory is its renormalizability, which implies that
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one can apply a certain power counting to renormalized quantities and perform a systematic expansion of the calculated observables in terms of some small parameter.
When nonperturbative effects become relevant, the requirement of the renormalizability imposes nontrivial constraints on a choice of...