Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 62: Hadronic Probes VI, Resonances, Reactions
HK 62.3: Talk
Thursday, March 19, 1998, 15:00–15:15, C
Search for the πNN resonance d′ at COSY 11 with the reaction pp → ppπ−π+∗ — •R. Bilger, R. Großmann, H. Clement, and G.J. Wagner — Physikalisches Institut der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen — and the COSY 11 Collaboration
The two-pion production in nucleon-nucleon collisions is the most
basic reaction for the hadronic production of resonances in
the πNN system which are decoupled from the NN channel. Evidence
for such a candidate has recently been found in the pionic double
charge exchange (DCX) reaction on nuclei [1,2] as well as in pp →
ppπ−π+ measured at CELSIUS [3].
Since the COSY 11 setup is particularly well suited for the
investigation of reactions right at particle production thresholds,
we have studied the reaction pp → d′π+ →
ppπ−π+ close to the estimated d′ production threshold. In a
first test run measurements have been carried out at Tp = 690, 715
and 725 MeV. We report about these measurements and a first analysis of the
data.
[1] R. Bilger et al., Phys. Rev. Lett. 71 (1993) 42;
72 (1994) 2972
[2] K. Föhl et al., Phys. Rev. Lett. 79 (1997) 3849
[3] W. Brodowski et al., Z. Phys. A355 (1996) 5
∗supported by BMBF (06 TU 886), DFG (Mu 705/3) and
KFA Jülich (COSY-046)