Amplitude analysis of the chi_{c1} to ηπ^+π^- decays

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Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia (10) GSI Helmholtzcentre for Heavy Ion Research GmbH D-64291 Darmstadt Germany (11) Guangxi Normal University Guilin 541004 People's Republic of China (12) Guangxi University Nanning 530004 People's Republic of China (13) Hangzhou Normal University Hangzhou 310036 People's Republic of China (14) Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany (15) Henan Normal University Xinxiang 453007 People's Republic of China (16) Henan University of Science Luoyang 471003 People's Republic of China (17) Huangshan College Huangshan 245000 People's Republic of China (18) Hunan University Changsha 410082 People's Republic of China (19) Indiana University Bloomington Indiana 47405 USA (20) (A) INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy (B) INFN University of Perugia I-06100 Perugia Italy (21) (A) INFN Sezione di Ferrara I-44122 Ferrara (B) University of Ferrara Italy (22) Johannes Gutenberg University of Mainz Germany (23) Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia (24) Justus-Liebig-Universitaet Giessen II. 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