6 papers
Form factors of the -meson in chiral perturbation theory
Kakha Shamanauri, Jambul Gegelia, Ulf-G. MeiÃner +1
We present the calculation of the electromagnetic form factors of the -meson at one loop in Chiral Perturbation Theory. The power-counting-violating terms in the loop diagrams…
Form factors of the meson from effective field theory and the lattice
Ulf-G. MeiÃner, Akaki Rusetsky, Ajay S. Sakthivasan +2
The calculation of resonance form factors in effective field theory as well as on the lattice is a highly challenging task. In a recent paper, we proposed a novel method based on t…
Modified Lüscher zeta-function and the modified effective range expansion in the presence of a long-range force
Rishabh Bubna, Hans-Werner Hammer, Bai-Long Hoid +3
An efficient numerical algoritm is proposed for the calculation of the modified Lüscher zeta-function in the presence of a long-range force. Using the formalism developed in Ref.~…
Exploring Efimov states in and three-body systems
Hai-Long Fu, Yong-Hui Lin, Feng-Kun Guo +4
The Efimov effect is an intriguing three-body quantum phenomenon. Searching for Efimov states within the realms of nuclear and hadronic physics presents a challenge due to the inhe…
Finite-volume effects in the -regime
Ulf-G. MeiÃner, Fabian Müller, Akaki Rusetsky
We derive a systematic perturbative expansion for the finite-volume energy spectrum of the non-linear -model in the -regime. The violation of the power-counting rule…
Effects of Final State Interactions on Landau Singularities
Ajay S. Sakthivasan, Maxim Mai, Akaki Rusetsky +1
In certain kinematic and particle mass configurations, triangle singularities may lead to line-shapes which mimic the effects of resonances. This well-known effect is scrutinized h…