TY  - JOUR
AU  - Xie, J. J.
AU  - Liang, W. H.
AU  - Oset, E.
PY  - 2019
DA  - 2019//
TI  - eta-He-4 interaction from the dd->eta He-4 reaction near threshold
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 6
EP  - 8pp
VL  - 55
IS  - 1
PB  - Springer
AB  - .We analyze the data on the total cross sections for the dd4 He reaction close to threshold and look for possible 4 He bound states. We develop a framework in which the 4 He optical potential is the key ingredient, rather than parameterizing the scattering matrix, as is usually done. The strength of this potential, together with some production parameters, are fitted to the available experimental data. The relationship of the scattering matrix to the optical potential is established using the Bethe-Salpeter equation and the 4 He loop function incorporates the range of the interaction given by the experimental He-4 density. However, when we look for poles of the scattering matrix, we get poles in the bound region, poles in the positive energy region or no poles at all. If we further restrict the results with constraints from a theoretical model with all its uncertainties the bound states are not allowed. However, we find a bump structure in |T|2 of the 4 He 4 He scattering amplitude below threshold for the remaining solutions.
SN  - 1434-6001
UR  - https://arxiv.org/abs/1805.12532
UR  - https://doi.org/10.1140/epja/i2019-12693-6
DO  - 10.1140/epja/i2019-12693-6
LA  - English
N1  - WOS:000456478000003
ID  - Xie_etal2019
ER  -