Neutron-Proton Scattering in the Context of the $d^{\ast }$(2380) Resonance

Abstract

New data on quasifree polarized neutron-proton scattering, in the region of the recently observed $d^{\ast }$ 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 ${}^3{D}_3$-${}^3{G}_3$ coupled partial waves at ($2380\pm 10-i40\pm 5$) MeV -- in accordance with the $d^{\ast }$ 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.

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