134 citations · 259 across the 9 of their papers we have counts for
9 papers
Effective Field Theory of Protonium
Hans-Werner Hammer, Akaki Rusetsky
We investigate the level shifts in protonium using the framework of non-relativistic effective field theory (NREFT). Our study is prompted by the PUMA collaboration's plans to prob…
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.~\…
Lüscher equation with long-range forces
Rishabh Bubna, Hans-Werner Hammer, Fabian Müller +3
We derive the modified Lüscher equation in the presence of the long-range force caused by the exchange of a light particle. It is shown that the use of this equation enables one to…
Reply to Comment on "Is a Trineutron Resonance Lower in Energy than a Tetraneutron Resonance?"
S. Gandolfi, H. -W. Hammer, P. Klos +2
We reply to a Comment on our Letter [Phys. Rev. Lett. 118, 232501 (2017), arXiv:1612.01502] by A. Deltuva and R. Lazauskas [Phys. Rev. Lett 123, 069201 (2019), arXiv:1904.00925].
Efimov universality with Coulomb interaction
C. H. Schmickler, H. -W. Hammer, E. Hiyama
The universal properties of charged particles are modified by the presence of a long-range Coulomb interaction. We investigate the modification of Efimov universality as a function…
Three-body spectrum in a finite volume: the role of cubic symmetry
M. Döring, H. -W. Hammer, M. Mai +3
The three-particle quantization condition is partially diagonalized in the center-of-mass frame by using cubic symmetry on the lattice. To this end, instead of spherical harmonics,…
Tetramer Bound States in Heteronuclear Systems
C. H. Schmickler, H. -W. Hammer, E. Hiyama
We calculate the universal spectrum of trimer and tetramer states in heteronuclear mixtures of ultracold atoms with different masses in the vicinity of the heavy-light dimer thresh…
Quantum Monte Carlo calculations of two neutrons in finite volume
P. Klos, J. E. Lynn, I. Tews +5
Ab initio calculations provide direct access to the properties of pure neutron systems that are challenging to study experimentally. In addition to their importance for fundamental…
Real-Time Dynamics of an Impurity in an Ideal Bose Gas in a Trap
A. G. Volosniev, H. -W. Hammer, N. T. Zinner
We investigate the behavior of a harmonically trapped system consisting of an impurity in a dilute ideal Bose gas after the boson-impurity interaction is suddenly switched on. As t…