https://doi.org/10.1140/epja/i2008-10710-7
Regular Article - Experimental Physics
Determination of the Dalitz plot parameter 
for the decay 
→ 3
with the Crystal Ball at MAMI-B
1
Institut für Kernphysik, University Mainz, Mainz, Germany
2
Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, Bonn, Germany
3
Department of Physics and Astronomy, University of Glasgow, Glasgow, UK
4
Petersburg Nuclear Physics Institute, Gatchina, Russia
5
Institut für Physik, University Basel, Basel, Switzerland
6
INFN Sezione di Pavia, Pavia, Italy
7
School of Physics, University of Edinburgh, Edinburgh, UK
8
Center for Nuclear Studies, The George Washington University, Washington, D.C., USA
9
University of California at Los Angeles, Los Angeles, CA, USA
10
Lebedev Physical Institute, Moscow, Russia
11
II. Physikalisches Institut, University Gießen, Gießen, Germany
12
Mount Allison University, Sackville, NB, Canada
13
Institute for Nuclear Research, Moscow, Russia
14
Rudjer Boskovic Institute, Zagreb, Croatia
15
Kent State University, Kent, OH, USA
16
The Catholic University of America, Washington, D.C., USA
* e-mail: unvemarc@kph.uni-mainz.de
Received:
19
December
2008
Accepted:
22
December
2008
Published online:
13
January
2009
A precise measurement of the Dalitz plot parameter, , for the → 3 decay is presented. The experiment was performed with the Crystal Ball and TAPS large-acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8 · 106
→ 3 events were obtained, giving the result = - 0.032±0.002stat±0.002syst .
PACS: 25.20.Lj Photoproduction reactions – / 13.60.Le Meson production – / 14.40.Aq 
, K and mesons – / 13.25.Jx Decays of other mesons –
© SIF, Springer-Verlag Berlin Heidelberg, 2009
