Neutron-Proton Scattering in the Context of the d^*(2380) Resonance

P. Adlarson , W. Augustyniak , W. Bardan , M. Bashkanov , F.S. Bergmann , M. Ber{\l}owski , H. Bhatt , M. B\"uscher

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H. Cal\'en I. Ciepa{\l} H. Clement D. Coderre E. Czerwi\'nski K. Demmich E. Doroshkevich R. Engels A. Erven W. Erven W. Eyrich P. Fedorets K. F\"ohl K. Fransson F. Goldenbaum P. Goslawski A. Goswami K. Grigoryev C.--O. Gullstr\"om F. Hauenstein L. Heijkenskj\"old V. Hejny M. Hodana B. H\"oistad N. H\"usken A. Jany B. R. Jany L. Jarczyk T. Johansson B. Kamys G. Kemmerling F. A. Khan A. Khoukaz D. A. Kirillov S. Kistryn H. Kleines B. K{\l}os M. Krapp W. Krzemie\'n P. Kulessa A. Kup\'s\'c K. Lalwani D. Lersch B. Lorentz A. Magiera R. Maier P. Marciniewski B. Maria\'nski M. Mikirtychiants H.--P. Morsch P. Moskal H. Ohm I. Ozerianska E. Perez del Rio N. M. Piskunov P. Podkopa{\l} D. Prasuhn A. Pricking D. Pszczel K. Pysz A. Pyszniak C. F. Redmer J. Ritman A. Roy Z. Rudy S. Sawant S. Schadmand T. Sefzick V. Serdyuk R. Siudak T. Skorodko M. Skurzok J. Smyrski V. Sopov R. Stassen J. Stepaniak E. Stephan G. Sterzenbach H. Stockhorst H. Str\"oher A. Szczurek A. T\"aschner A. Trzci\'nski R. Varma G. J. Wagner M. Wolke A. Wro\'nska P. W\"ustner P. Wurm A. Yamamoto L. Yurev J. Zabierowski M. J. Zieli\'nski A. Zink J. Z{\l}oma\'nczuk P. {\.Z}upra\'nski M. {\.Z}urek (WASA-at-COSY Collaboration) R. L. Workman W. J. Briscoe I. I. Strakovsky (SAID Data Analysis Center)

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classification ⚛️ nucl-ex hep-ex

keywords resonancedatascatteringmeasurementsneutron-protonobtainedpartial-wavequasifree

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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.

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Neutron-Proton Scattering in the Context of the d^*(2380) Resonance

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