Evidence for a New Resonance from Polarized Neutron-Proton Scattering

WASA COSY Collaboration, SAID Data Anal Ctr, P. Adlarson*, W. Augustyniak, W. Bardan, M. Bashkanov, F. S. Bergmann, M. Berlowski, H. Bhatt, M. Buescher, H. Calen, I. Ciepal, H. Clement, D. Coderre, E. Czerwinski, K. Demmich, E. Doroshkevich, R. Engels, A. Erven, W. ErvenW. Eyrich, P. Fedorets, K. Foehl, K. Fransson, F. Goldenbaum, P. Goslawski, A. Goswami, K. Grigoryev, C. -O. Gullstrom, F. Hauenstein, L. Heijkenskjold, V. Hejny, M. Hodana, B. Hoistad, N. Huesken, 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. Klos, M. Krapp, W. Krzemien, P. Kulessa, A. Kupsc, K. Lalwani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Exclusive and kinematically complete high-statistics measurements of quasifree polarized (n) over right arrowp scattering have been performed in the energy region of the narrow resonancelike structure d* with I(J(P)) = 0(3(+)),M approximate to 2380 MeV, and Gamma approximate to 70 MeV observed recently in the double-pionic fusion channels pn -> d pi(0)pi(0) and pn -> 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 (d) over right arrowp -> np + p(spectator). This allowed the np analyzing power, A(y), to be measured over a broad 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 D-3(3) - (3)G(3) waves in support of the d* resonance hypothesis.

Original languageEnglish
Article number202301
Number of pages6
JournalPhysical Review Letters
Volume112
Issue number20
DOIs
Publication statusPublished - 23 May 2014

Keywords / Materials (for Non-textual outputs)

  • PARTIAL-WAVE ANALYSIS
  • ANALYZING POWER
  • ELASTIC-SCATTERING
  • SPIN OBSERVABLES
  • DIBARYON
  • STATES

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