학술논문
Evidence for a New Resonance from Polarized Neutron-Proton Scattering
Document Type
Working Paper
Author
Adlarson, P.; Augustyniak, W.; Bardan, W.; Bashkanov, M.; Bergmann, F. S.; Berlowski, M.; Bhatt, H.; Buescher, M.; Ciepa, H. Calen. I.; Clement, H.; Coderre, D.; Czerwinski, E.; Demmich, K.; Doroshkevich, E.; Engels, R.; Erven, A.; Erven, W.; Eyrich, W.; Fedorets, P.; Foehl, K.; Fransson, K.; Goldenbaum, F.; Goslawski, P.; Goswami, A.; Grigoyev, K.; Gullstroem, C. -O.; Hauenstein, F.; Heijkenskjoeld, L.; Hejny, V.; Hodana, M.; Hoistad, B.; Huesken, N.; Jany, A.; Jany, B. R.; Jarczyk, L.; Johansson, T.; Kamys, B.; Kemmerling, G.; Khan, F. A.; Khoukaz, A.; Kirrilov, D. A.; Kistryn, S.; Kleines, H.; Klos, B.; Krapp, M.; Krzemien, W.; Kulessa, P.; Kupsc, A.; Lalwani, K.; Lersch, D.; Lorentz, B.; Magiera, A.; Maier, R.; Marciniewski, P.; Marianski, B.; Mikirtychiants, M.; Morsch, H. -P.; Moskal, P.; Ohm, H.; Ozerianska, I.; del Rio, E. Perez; Piskunov, N. M.; Podkopal, P.; Prasuhn, D.; Pricking, A.; Pszczel, D.; Pysz, K.; Pysniak, A.; Redmer, C. F.; Ritman, J.; Roy, A.; Rudy, Z.; Sawant, S.; Schadmand, S.; Sefzick, T.; Serdyuk, V.; Siudak, R.; Skorodko, T.; Skurzok, M.; Smyrski, J.; Sopov, V.; Stassen, R.; Stepaniak, J.; Stephan, E.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Szczurek, A.; Taeschner, A.; Trzcinski, A.; Varma, R.; Wagner, G. J.; Wolke, M.; Wronska, A.; Wuestner, P.; Wurm, P.; Yamamoto, A.; Yurev, L.; Zabierowski, J.; Zielinski, M. J.; Zink, A.; Zlomanczuk, J.; Zupranski, P.; Zurek, M.; Workman, R. L.; Briscoe, W. J.; Strakovsky, I. I.
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Abstract
Exclusive and kinematically complete high-statistics measurements of quasifree polarized $\vec{n}p$ scattering have been performed in the energy region of the narrow resonance structure $d^*$ with $I(J^P) = 0(3^+)$, $M \approx$ 2380 MeV/$c^2$ and $\Gamma \approx$ 70 MeV observed recently in the double-pionic fusion channels $pn \to d\pi^0\pi^0$ and $pn \to d\pi^+\pi^-$. The experiment was carried out with the WASA detector setup at COSY having a polarized deuteron beam impinged on the hydrogen pellet target and utilizing the quasifree process $\vec{d}p \to np + p_{spectator}$. That way the $np$ analyzing power $A_y$ was measured over a large angular range. The obtained $A_y$ angular distributions deviate systematically from the current SAID SP07 NN partial-wave solution. Incorporating the new $A_y$ data into the SAID analysis produces a pole in the $^3D_3 - ^3G_3$ waves as expected from the $d^*$ resonance hypothesis.