Determination of the Dalitz plot parameter $ \alpha$ for the decay $ \eta$ → 3 $ \pi^{0}_{}$ with the Crystal Ball at MAMI-B

M Unverzagt,R Beck,J R M Annand,I J D Macgregor,K Livingston,D P Watts,C M Tarbert,J Ahrens,D Hornidge,B M K Nefkens,W J Briscoe,G Rosner,S Lugert,D Branford,F Zehr,R Gregor,E J Downie,M Korolija,D M Manley,P Aguar-Bartolomé,R Kondratiev,M Martinez-Fabregate,J C Mcgeorge,S Cherepnya,M Rost,V Lisin,D Krambrich,V Metag,D I Glazier,A Polonski,Th Walcher,T Rostomyan,V L Kashevarov,A Starostin,I Supek,B Boillat,H J Arends,M Kotulla,P Pedroni,B Krusche,O Jahn,J W Price,L.v Filʼkov ,A Thomas,R F B Codling ,S Prakhov ,A Nikolaev,D Mekterović ,S Schumann,V Bekrenev,R.o Owens ,J Brudvik ,A Braghieri,Μ Lang ,E Heid,D I Sober ,R Novotny

doi:10.1140/epja/i2008-10710-7

Determination of the Dalitz plot parameter $ \alpha$ for the decay $ \eta$ → 3 $ \pi^{0}_{}$ with the Crystal Ball at MAMI-B

M Unverzagt, R Beck + Show 55 more

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https://doi.org/10.1140/epja/i2008-10710-7

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Journal: The European physical journal. A, Hadrons and nuclei	Publication Date: Jan 13, 2009
Citations: 45

Affiliation: University of Bonn, University of Glasgow, University of Edinburgh, Mount Allison University, University of California, Los Angeles, George Washington University, University of Basel, Kent State University, P.N. Lebedev Physical Institute of the Russian Academy of Sciences

#Crystal Ball #Measurement Of Parameter + Show 8 more

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Abstract

A precise measurement of the Dalitz plot parameter, $ \alpha$ , for the $ \eta$ → 3$ \pi^{0}_{}$ 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 $ \eta$ → 3$ \pi^{0}_{}$ events were obtained, giving the result $ \alpha$ = - 0.032±0.002stat±0.002syst .

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