/ nucl-ex arXiv:1402.6844


Evidence for a New Resonance from Polarized Neutron-Proton Scattering


Adlarson, P. (Uppsala U.) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Bardan, W. (Jagiellonian U.) ; Bashkanov, M. (Tubingen U.) ; Bergmann, F.S. (Munster U.) ; Berlowski, M. (Warsaw, Inst. Nucl. Studies) ; Bhatt, H. (Indian Inst. Tech., Mumbai) ; Buscher, M. (Heinrich Heine U., Dusseldorf) ; Calen, H. (Uppsala U.) ; Ciepal, I. (Jagiellonian U.) ; Clement, H. (Tubingen U.) ; Coderre, D. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Czerwinski, E. (Jagiellonian U.) ; Demmich, K. (Munster U.) ; Doroshkevich, E. (Tubingen U.) ; Engels, R. (JCHP, Julich) ; Erven, A. (JCHP, Julich) ; Erven, W. (JCHP, Julich) ; Eyrich, W. (Erlangen - Nuremberg U.) ; Fedorets, P. (Moscow, ITEP) ; Fohl, K. (Giessen U.) ; Fransson, K. (Uppsala U.) ; Goldenbaum, F. (JCHP, Julich) ; Goslawski, P. (Munster U.) ; Goswami, A. (Indian Inst. Tech., Indore) ; Grigoryev, K. (St. Petersburg, INP) ; Gullstrom, C.O. (Uppsala U.) ; Hauenstein, F. (Erlangen - Nuremberg U.) ; Heijkenskjold, L. (Uppsala U.) ; Hejny, V. (JCHP, Julich) ; Hodana, M. (Jagiellonian U.) ; Hoistad, B. (Uppsala U.) ; Husken, N. (Munster U.) ; Jany, A. (Jagiellonian U.) ; Jany, B.R. (Jagiellonian U.) ; Jarczyk, L. (Jagiellonian U.) ; Johansson, T. (Uppsala U.) ; Kamys, B. (Jagiellonian U.) ; Kemmerling, G. (JCHP, Julich) ; Khan, F.A. (JCHP, Julich) ; Khoukaz, A. (Munster U.) ; Kirillov, D.A. (Dubna, JINR) ; Kistryn, S. (Jagiellonian U.) ; Kleines, H. (JCHP, Julich) ; Klos, B. (Silesia U.) ; Krapp, M. (Erlangen - Nuremberg U.) ; Krzemien, W. (Jagiellonian U.) ; Kulessa, P. (Cracow, INP) ; Kupsc, A. (Warsaw, Inst. Nucl. Studies) ; Lalwani, K. (Indian Inst. Tech., Mumbai) ; Lersch, D. (JCHP, Julich) ; Lorentz, B. (JCHP, Julich) ; Magiera, A. (Jagiellonian U.) ; Maier, R. (JCHP, Julich) ; Marciniewski, P. (Uppsala U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Mikirtychiants, M. (St. Petersburg, INP) ; Morsch, H.P. (Warsaw, Inst. Nucl. Studies) ; Moskal, P. (Jagiellonian U.) ; Ohm, H. (JCHP, Julich) ; Ozerianska, I. (Jagiellonian U.) ; Perez del Rio, E. (Tubingen U.) ; Piskunov, N.M. (Dubna, JINR) ; Podkopal, P. (Jagiellonian U.) ; Prasuhn, D. (JCHP, Julich) ; Pricking, A. (Tubingen U.) ; Pszczel, D. (Warsaw, Inst. Nucl. Studies) ; Pysz, K. (Cracow, INP) ; Pyszniak, A. (Jagiellonian U.) ; Redmer, C.F. (Uppsala U.) ; Ritman, J. (Ruhr U., Bochum, Inst. Expt. Phys.) ; Roy, A. (Indian Inst. Tech., Indore) ; Rudy, Z. (Jagiellonian U.) ; Sawant, S. (JCHP, Julich) ; Schadmand, S. (JCHP, Julich) ; Sefzick, T. (JCHP, Julich) ; Serdyuk, V. (JCHP, Julich) ; Serdyuk, V. (Dubna, JINR) ; Siudak, R. (Cracow, INP) ; Skorodko, T. (Tubingen U.) ; Skurzok, M. (Jagiellonian U.) ; Smyrski, J. (Jagiellonian U.) ; Sopov, V. (Moscow, ITEP) ; Stassen, R. (JCHP, Julich) ; Stepaniak, J. (Warsaw, Inst. Nucl. Studies) ; Stephan, E. (Silesia U.) ; Sterzenbach, G. (JCHP, Julich) ; Stockhorst, H. (JCHP, Julich) ; Stroher, H. (JCHP, Julich) ; Szczurek, A. (Cracow, INP) ; Taschner, A. (Munster U.) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Varma, R. (Indian Inst. Tech., Mumbai) ; Wagner, G.J. (Tubingen U.) ; Wolke, M. (Uppsala U.) ; Wronska, A. (Jagiellonian U.) ; Wustner, P. (JCHP, Julich) ; Wurm, P. (JCHP, Julich) ; Yamamoto, A. (KEK, Tsukuba) ; Yurev, L. (Dubna, JINR) ; Zabierowski, J. (Lodz, IPJ) ; Zielinski, M.J. (Jagiellonian U.) ; Zink, A. (Erlangen - Nuremberg U.) ; Zlomanczuk, J. (Uppsala U.) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies) ; Zurek, M. (JCHP, Julich) ; Workman, R.L. (George Washington U.) ; Briscoe, W.J. (George Washington U.) ; Strakovsky, I.I. (George Washington U.)

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.

Web-Page: http://inspirehep.net/record/1282943/files/SAID_amp_3D3_a_r1.png; http://inspirehep.net/record/1282943/files/SAID_amp_3G3_a_r1.png; http://inspirehep.net/record/1282943/files/SAID_amp_E3_a_r1.png; http://inspirehep.net/record/1282943/files/SAID_fig1_vr1.png; http://inspirehep.net/record/1282943/files/SAID_fig2_1_vr1.png; http://inspirehep.net/record/1282943/files/SAID_fig2_4_vr1.png; http://inspirehep.net/record/1282943/files/SAID_fig4_2_s_vb1_a.png; http://inspirehep.net/record/1282943/files/arXiv:1402.6844.pdf


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