2023 Impact factor 2.6
Hadrons and Nuclei

Eur. Phys. J. A 9, 309-311

Short note

Search for narrow dibaryon resonances in neutral pion photoproduction from the deuteron

U. Siodlaczek1 - P. Achenbach2 - J. Ahrens3 - H.-J. Arends3 - R. Beck3 - R. Bilger1 - H. Clement1 - V. Hejny4 - J.D. Kellie8 - M. Kotulla2 - B. Krusche7 - V. Kuhr5 - R. Leukel3 - J.C. McGeorge8 - V. Metag2 - R. Novotny2 - V. Olmos de León3 - F. Rambo5 - M. Schepkin6 - A. Schmidt3 - H. Ströher4 - G.J. Wagner1 - Th. Walcher3 - J. Weiß2 - F. Wissmann5 - M. Wolf2

1 Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
2 II. Physikalisches Institut, Universität Gieß en, D-35392 Gießen, Germany
3 Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany
4 Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich, Germany
5 II. Physikalisches Institut, Universität Göttingen, D-37073 Göttingen, Germany
6 Institute for Theoretical and Experimental Physics, Moscow 117218, Russia
7 Institut für Physik und Astronomie, Universität Basel, Klingelbergstr. 82, CH-4056 Basel, Switzerland
8 Department of Physics and Astronomy, University of Glasgow, Glasgow G128 QQ, UK

Received: 25 October 2000
Communicated by M. Garçon

The reaction $\gamma d \to \pi^0X$ has been measured with TAPS at MAMI in the energy range $E_\gamma = 140$-300 MeV. Using the Glasgow tagging spectrometer a photon energy resolution of 0.8 MeV was achieved. The energy excitation functions of integral and differential total cross-sections show no structures of statistical significance $> 2\sigma$. Upper limits for the production of narrow isoscalar or isovector dibaryons with masses $m \leq 2100$ MeV/c2 were deduced. They are in the range 2-5 $\mu$b averaged over the 0.8 MeV energy resolution.

13.60.Le Meson production - 14.20.Pt Dibaryons - 25.20.Lj Photoproduction reactions

Copyright Società Italiana di Fisica, Springer-Verlag 2000