Journal Article

PreJuSER-18776

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?

Adlarson, P. e. a. ; Baru, V. ; Bashkanov, M. ; Berlowski, M. ; Bhatt, H. ; Buescher, M.FZJ* ; Calen, H. ; Clement, H. ; Engels, R.FZJ* ; Erven, W. ; Eyrich, W. ; Fedorets, P.FZJ* ; Fransson, K. ; Goldenbaum, F.FZJ* ; Hanhart, C.FZJ* ; Hejny, V.FZJ* ; Hinterberger, F. ; Jarczyk, L. ; Kamys, B. ; Khoukaz, A.

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7375  doi:10.1103/PhysRevLett.106.242302

Abstract: We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn -> d pi(0)pi(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the pi pi-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t- channel Delta Delta process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section. The observables are consistent with a narrow resonance with m = 2.37 GeV, Gamma approximate to 70 MeV and I(J(P)) = 0(3(+)) in both pn and Delta Delta systems. Necessary further tests of the resonance interpretation are discussed.

Keyword(s): J

Note: We acknowledge valuable discussions with L. Alvarez-Ruso, A. Kudryavtsev, E. Oset, A. Sibirtsev, F. Wang, and C. Wilkin on this issue. This work has been supported by BMBF (06TU9193), Forschungszentrum Julich (COSY-FFE), DFG (683) and the Foundation for Polish Science (MPD) and EU (Regional Development Fund).

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Contributing Institute(s):

1. Experimentelle Hadrondynamik (IKP-2)
2. Institut 3 (Theoretische Kernphysik) (IKP-3)
3. Zentralinstitut für Elektronik (ZEL)
4. Experimentelle Hadronstruktur (IKP-1)

Research Program(s):

1. Physik der Hadronen und Kerne (P53)

Experiment(s):

1. WASA (Wide Angle Shower Apparatus) at COSY

Appears in the scientific report 2011

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