Neutron-Proton Scattering in the Context of the $d^*$(2380) Resonance
  New data on quasifree polarized neutron-proton scattering, in the region of the recently observed $d^*$ resonance structure, have been obtained by exclusive and kinematically complete high-statistics measurements with WASA at COSY. This paper details the determination of the beam polarization, checks of the quasifree character of the scattering process, on all obtained $A_y$ angular distributions and on the new partial-wave analysis, which includes the new data producing a resonance pole in the $^3D_3$-$^3G_3$ coupled partial waves at ($2380\pm10 - i40\pm5$) MeV -- in accordance with the $d^*$ dibaryon resonance hypothesis. The effect of the new partial-wave solution on the description of total and differential cross section data as well as specific combinations of spin-correlation and spin-transfer observables available from COSY-ANKE measurements at $T_d$ = 2.27 GeV is discussed. 
P. Adlarson, W. Augustyniak, W. Bardan, M. Bashkanov, F.S. Bergmann,   M. Ber{\l}owski, H. Bhatt, M. B\"uscher, H. Cal\'en, ...
nucl-ex hep-ex