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A chiral covariant approach to \(\varvec{\rho \rho }\) scattering

. U.-G. Meißner, J.A. Oller, Nucl. Phys. A 673, 311 (2000). arXiv:nucl-th/9912026 53. J.M. Alarcon, J. Martin Camalich, J.A. Oller, Ann. Phys. 336, 413 (2013). arXiv:1210.4450 [hep-ph] 54. M ... . Albaladejo, J.A. Oller, L. Roca, Phys. Rev. D 82, 094019 (2010). arXiv:1011.1434 [hep-ph] 55. P.C. Bruns, M. Mai, U.-G. Meißner, Phys. Lett. B 697, 254 (2011). arXiv:1012.2233 [nucl-th] 56. M. Mai, U.-G

Role of the Total Isospin 3/2 Component in Three-Nucleon Reactions

We discuss the role of the three-nucleon isospin \(T=3/2\) amplitude in elastic neutron–deuteron scattering and in the deuteron breakup reaction. The contribution of this amplitude originates from charge-independence breaking of the nucleon–nucleon potential and is driven by the difference between neutron–neutron (proton–proton) and neutron–proton forces. We study the magnitude of ...

Matrix elements of unstable states

Using the language of non-relativistic effective Lagrangians, we formulate a systematic framework for the calculation of resonance matrix elements in lattice QCD. The generalization of the Lüscher-Lellouch formula for these matrix elements is derived. We further discuss in detail the procedure of the analytic continuation of the resonance matrix elements into the complex energy ...

DN interaction from meson exchange

A model of the DN interaction is presented which is developed in close analogy to the meson-exchange \( \bar{{K}}\) N potential of the Jülich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (\( \rho\) , \( \omega\) exchange and higher-order box diagrams involving D * N , D \( \Delta\) , and D * \( \Delta\) ...

Scalar mesons in a finite volume

Using effective field theory methods, we discuss the extraction of the mass and width of the scalar mesons f 0(980) and a 0(980) from the finite-volume spectrum in lattice QCD. In particular, it is argued that the nature of these states can be studied by invoking twisted boundary conditions, as well as investigating the quark mass dependence of the spectrum.

Primakoff effect in \( \eta\) -photoproduction off protons

We analyse data on forward \( \eta\) -meson photoproduction off a proton target and extract the \( \eta\) \( \rightarrow\) \( \gamma\) \( \gamma\) decay width utilizing the Primakoff effect. The hadronic amplitude that enters into our analysis is strongly constrained because it is fixed from a global fit to available \( \gamma\) p \( \rightarrow\) p \( \eta\) data for differential ...

The pion-nucleon scattering lengths from pionic deuterium

.-G. Meißner , D.R. Phillips , Nucl. Phys. A 720 , 399 ( 2003 ) [arXiv:hepph/0206219]. 3. B. Borasoy , H.W. Grießhammer , Int. J. Mod . Phys . E 12 , 65 ( 2003 ) [arXiv:nucl -th/0105048]; S.R. Beane ... to carry out these calculations in a simpler setting. 1. U.G. Meißner , U. Raha , A. Rusetsky , Eur. Phys. J. C 41 , 213 ( 2005 ) [arXiv:nucl-th/0501073] 2. S.R. Beane , V. Bernard , E. Epelbaum , U