Evidence for a New Resonance from Polarized Neutron-Proton Scattering

• DOI: 10.1103/physrevlett.112.202301
• Publication Date: 2014-05-23T21:08:19Z
• Authors: P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F. S. Bergmann; M. Berłowski; H. Bhatt; M. Büscher; H. Calén; I. Ciepał; H. Clement; D. Coderre; E. Czerwiński; K. Demmich; E. Doroshkevich; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C.-O. Gullström; F. Hauenstein; L. Heijkenskjöld; V. Hejny; M. Hodana; B. Höistad; N. Hüsken; 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. Kłos; M. Krapp; W. Krzemień; P. Kulessa; A. Kupść; K. Lalwani; D. Lersch; B. Lorentz; A. Magiera; R. Maier; P. Marciniewski; B. Mariański; M. Mikirtychiants; H.-P. Morsch; P. Moskal; H. Ohm; I. Ozerianska; E. Perez del Rio; N. M. Piskunov; P. Podkopał; 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; V. Serdyuk; R. Siudak; T. Skorodko; M. Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; E. Stephan; G. Sterzenbach; H. Stockhorst; H. Ströher; A. Szczurek; A. Täschner; A. Trzciński; R. Varma; G. J. Wagner; M. Wolke; A. Wrońska; P. Wüstner; P. Wurm; A. Yamamoto; L. Yurev; J. Zabierowski; M. J. Zieliński; A. Zink; J. Złomańczuk; P. Żuprański; M. Żurek; R. L. Workman; W. J. Briscoe; I. I. Strakovsky
• Keywords: Beam energy

Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\stackrel{\ensuremath{\rightarrow}}{n}p$ scattering have been performed in the energy region narrow resonancelike structure ${d}^{*}$ with $I({J}^{P})=0({3}^{+})$, $M\ensuremath{\approx}2380\text{ }\text{ }\mathrm{MeV}$, $\mathrm{\ensuremath{\Gamma}}\ensuremath{\approx}70\text{ }\mathrm{MeV}$ observed recently double-pionic fusion channels $pn\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ $pn\ensuremath{\rightarrow}d{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$. The experiment was carried out WASA detector setup at COSY having a deuteron beam impinged on hydrogen pellet target utilizing process $\stackrel{\ensuremath{\rightarrow}}{d}p\ensuremath{\rightarrow}np+{p}_{\text{spectator}}$. This allowed $np$ analyzing power, ${A}_{y}$, to be measured over broad angular range. obtained ${A}_{y}$ distributions deviate systematically from current SAID SP07 NN partial-wave solution. Incorporating new data into analysis produces pole $^{3}{D}_{3}\ensuremath{-}^{3}{G}_{3}$ waves support resonance hypothesis.