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; 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)

arXiv:1408.4928·nucl-ex·June 22, 2015

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, 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

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TL;DR

This paper presents new polarized neutron-proton scattering data near the $d^*$ resonance, confirming a resonance pole at 2380 MeV and analyzing its impact on scattering observables, supporting the $d^*$ dibaryon hypothesis.

Contribution

It provides the first high-statistics polarized scattering data in the $d^*$ resonance region and introduces a new partial-wave analysis confirming the resonance pole.

Findings

01

Resonance pole at (2380±10 - i40±5) MeV in partial-wave analysis.

02

Agreement of the resonance with the $d^*$ dibaryon hypothesis.

03

Improved description of cross sections and spin observables.

Abstract

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 $^{3} D_{3}$ - $^{3} G_{3}$ coupled partial waves at ( $2380 \pm 10 - i 40 \pm 5$ ) 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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