Constraints on a possible dineutron state from pionless EFT

H.-W. Hammer, Sebastian König
2014 Physics Letters B  
We investigate the sensitivity of the three-nucleon system to changes in the neutron-neutron scattering length to next-to-leading order in the pionless effective field theory, focusing on the the triton-3He binding energy difference and neutron-deuteron elastic scattering. Due to the appearance of an electromagnetic three-body counterterm at this order, the triton-3He binding energy difference remains consistent with the experimental value even for large positive neutron-neutron scattering
more » ... ron scattering lengths while the elastic neutron-deuteron scattering phase shifts are insensitive. We conclude that a bound dineutron cannot be excluded to next-to-leading order in pionless EFT.
doi:10.1016/j.physletb.2014.07.015 fatcat:bln4n2syp5evvoktayptdbitea