179 citations · 287 across the 9 of their papers we have counts for
9 papers
Factorization in quasi-free breakup reactions with two bodies left behind
Raúl A. Briceño, Caroline S. R. Costa, Hans-Werner Hammer +1
We consider scenarios in which a shallow bound state undergoes breakup by a probe whose energy is high compared to the binding energy. The first two scenarios, which serve as warm-…
Short-distance production of three particles with large scattering length
Timothy G. Backert, Sebastian Dietz, Hans-Werner Hammer +2
The short-distance production of multi-particle states in high-energy nuclear reactions provides a unique way to study the low-energy properties of few-body systems. In particular,…
Neutron-neutron distribution of the triton from pionless EFT
Tanja Kirchner, Matthias Göbel, Hans-Werner Hammer
We compute the neutron-neutron relative-energy distribution of the triton following the hard knockout of the proton in pionless effective field theory. This distribution can be use…
Entanglement in few-nucleon scattering events
Tanja Kirchner, Wael Elkamhawy, Hans-Werner Hammer
We investigate the spin entanglement in few-nucleon scattering processes involving nucleons and deuterons. For this purpose, we consider the entanglement power introduced by Beane…
General aspects of effective field theories and few-body applications
H. -W. Hammer, Sebastian König
Effective field theory provides a powerful framework to exploit a separation of scales in physical systems. In these lectures, we discuss some general aspects of effective field th…
Low Energy Expansion in the Three Body System to All Orders and the Triton Channel
Paulo F. Bedaque, Harald W. Griesshammer, H. -W. Hammer +1
We extend and systematise the power counting for the three-body system, in the context of the ``pion-less'' Effective Field Theory approach, to all orders in the low-energy expansi…
The Hypertriton in Effective Field Theory
H. -W. Hammer
Doublet Lambda d scattering and the hypertriton are studied in the framework of an effective field theory for large scattering lengths. As in the triton case, consistent renormaliz…
Rare Pionium Decays and Pion Polarizability
H. -W. Hammer, J. N. Ng
We calculate the decay of pionium atoms into two photons. The pion polarizability gives rise to a 10% correction to the corresponding decay width for pointlike pions. This opens th…
Parity-Violating Excitation of the Δ(1232): Hadron Structure and New Physics
N. C. Mukhopadhyay, M. J. Ramsey-Musolf, S. J Pollock +2
We consider prospects for studying the parity-violating (PV) electroweak excitation of the Δ(1232) resonance with polarized electron scattering. Given present knowledge of Standard…