First observation of the reaction $\gamma \gamma \to \pi_2 \to \pi^0 \pi^0 \pi^0$
- Antreasyan, D.
- Bartels, H. W. S.
- Cartacci, A.
- Cavalli-Sforza, M.
- Clare, R.
- Compagnucci, A.
- Conforto, G.
- Cooper, S.
- Cowan, R.
- Coyne, D. G.
- Engler, A.
- Fairfield, K.
- Besset, D.
- Folger, G.
- Fridman, A.
- Gaiser, J.
- Gelphman, D.
- Glaser, G.
- Godfrey, G.
- Graaf, K.
- Heimlich, F. H.
- Heinsius, F. H.
- Hofstadter, R.
- Bieler, C.
- Irion, J.
- Jakubowski, Z.
- Janssen, H.
- Karch, K.
- Keh, S.
- Kiel, T.
- Kilian, H.
- Kirkbride, I.
- Kloiber, T.
- Kobel, M.
- Bienlein, J. K.
- Koch, W. S.
- Konig, A. C.
- Konigsmann, Kay
- Kraemer, R. W.
- Kruger, S.
- Landi, G.
- Lee, R.
- Leffler, S.
- Lekebusch, R.
- Litke, A.
- Bizzeti, A.
- Lockman, William S.
- Lowe, S.
- Lurz, B.
- Marlow, Daniel R.
- Marsiske, H.
- Maschmann, W. S.
- McBride, P.
- Messing, F.
- Metzger, W. J.
- Meyer, H.
- Bloom, Elliott D.
- Monteleoni, B.
- Muryn, B.
- Nernst, R.
- Niczyporuk, B.
- Nowak, G.
- Peck, C.
- Pelfer, P. G.
- Pollock, B.
- Porter, F.
- Prindle, D.
- Brock, I.
- Ratoff, P.
- Reidenbach, M.
- Renger, B.
- Rippich, C.
- Scheer, M.
- Schmitt, P.
- Schotanus, J.
- Schutte, J.
- Schwarz, Andreas S.
- Sievers, D.
- Brockmuller, K.
- Skwarnicki, T.
- Stock, V.
- Strauch, K.
- Strohbusch, U.
- Tompkins, J.
- Trost, H. J.
- van Uitert, B.
- Van de Walle, R. T.
- Vogel, H.
- Voigt, A.
- Cabenda, R.
- Volland, U.
- Wachs, K.
- Wacker, K.
- Walk, W. S.
- Wegener, H.
- Williams, D.
- Zschorsch, P.
- Crystal Ball Collaboration
DOIAbstract
The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reactionγγ→π0π0π0 in theπ0π0π0 invariant mass range from 850 MeV/c2 to 2600 MeV/c2. An enhancement around 1750 MeV/c2 is attributed to theπ2(1670) resonance. The observedπ0π0 invariant mass distribution and theπ0 angular distributions are consistent with those expected for the decay chainπ2→π0f2(1270)→π0π0π0. From our measurements we find the following resonance parameters: two photon partial width\(\Gamma _{\pi _2 }^{\gamma \gamma }= (1.41 \pm 0.23 \pm 0.28)keV\), massM(π2)=(1742±31±49)MeV/c2. and total width\(\Gamma _{\pi _2 }^{tot}= (236 \pm 49 \pm 36)MeV\)
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