Amplitude Analysis of D_{s}^{+}→π^{+}π^{0}η and First Observation of the W-Annihilation Dominant Decays D_{s}^{+}→a_{0}(980)^{+}π^{0} and D_{s}^{+}→a_{0}(980)^{0}π^{+}. M Ablikim , M N Achasov , S Ahmed , M Albrecht , M Alekseev , A Amoroso , F F An , Q An , J Z Bai , Y Bai , O Bakina , R Baldini Ferroli , Y Ban , K Begzsuren , J V Bennett , N Berger , M Bertani , D Bettoni , F Bianchi , E Boger , I Boyko , R A Briere , H Cai , X Cai , A Calcaterra , G F Cao , N Cao , S A Cetin , J Chai , J F Chang , G Chelkov , G Chen , H S Chen , J C Chen , M L Chen , S J Chen , X R Chen , Y B Chen , W Cheng , X K Chu , G Cibinetto , F Cossio , X F Cui , H L Dai , J P Dai , A Dbeyssi , D Dedovich , Z Y Deng , A Denig , I Denysenko , M Destefanis , F De Mori , Y Ding , C Dong , J Dong , L Y Dong , M Y Dong , S X Du , J Fang , S S Fang , Y Fang , R Farinelli , L Fava , F Feldbauer , G Felici , C Q Feng , M Fritsch , C D Fu , Q Gao , X L Gao , Y Gao , Y G Gao , Z Gao , B Garillon , I Garzia , A Gilman , K Goetzen , L Gong , W X Gong , W Gradl , M Greco , M H Gu , Y T Gu , A Q Guo , R P Guo , Y P Guo , A Guskov , S Han , X Q Hao , F A Harris , K L He , X Q He , F H Heinsius , T Held , Y K Heng , Y R Hou , Z L Hou , H M Hu , J F Hu , T Hu , Y Hu , G S Huang , J S Huang , X T Huang , Z L Huang , T Hussain , W Ikegami Andersson , W Imoehl , M Irshad , Q Ji , Q P Ji , X B Ji , X L Ji , X S Jiang , X Y Jiang , J B Jiao , Z Jiao , D P Jin , S Jin , Y Jin , T Johansson , N Kalantar-Nayestanaki , X S Kang , R Kappert , M Kavatsyuk , B C Ke , I K Keshk , T Khan , A Khoukaz , P Kiese , R Kiuchi , R Kliemt , L Koch , O B Kolcu , B Kopf , M Kuemmel , M Kuessner , A Kupsc , M Kurth , M G Kurth , W Kühn , J S Lange , P Larin , L Lavezzi , H Leithoff , C Li , Cheng Li , D M Li , F Li , F Y Li , G Li , H B Li , H J Li , J C Li , J W Li , Jin Li , K J Li , Kang Li , Ke Li , L K Li , Lei Li , P L Li , P R Li , Q Y Li , W D Li , W G Li , X L Li , X N Li , X Q Li , Z B Li , H Liang , Y F Liang , Y T Liang , G R Liao , L Z Liao , J Libby , C X Lin , D X Lin , B Liu , B J Liu , C X Liu , D Liu , D Y Liu , F H Liu , Fang Liu , Feng Liu , H B Liu , H M Liu , Huanhuan Liu , Huihui Liu , J B Liu , J Y Liu , K Y Liu , Ke Liu , L D Liu , Q Liu , S B Liu , X Liu , X Y Liu , Y B Liu , Z A Liu , Zhiqing Liu , Y F Long , X C Lou , H J Lu , J G Lu , Y Lu , Y P Lu , C L Luo , M X Luo , T Luo , X L Luo , S Lusso , X R Lyu , F C Ma , H L Ma , L L Ma , M M Ma , Q M Ma , T Ma , X N Ma , X Y Ma , Y M Ma , F E Maas , M Maggiora , S Maldaner , Q A Malik , A Mangoni , Y J Mao , Z P Mao , S Marcello , Z X Meng , J G Messchendorp , G Mezzadri , J Min , R E Mitchell , X H Mo , Y J Mo , C Morales Morales , N Yu Muchnoi , H Muramatsu , A Mustafa , Y Nefedov , F Nerling , I B Nikolaev , Z Ning , S Nisar , S L Niu , X Y Niu , S L Olsen , Q Ouyang , S Pacetti , Y Pan , M Papenbrock , P Patteri , M Pelizaeus , J Pellegrino , H P Peng , K Peters , J Pettersson , J L Ping , R G Ping , A Pitka , R Poling , V Prasad , M Qi , T Y Qi , S Qian , C F Qiao , N Qin , X S Qin , Z H Qin , J F Qiu , S Q Qu , K H Rashid , C F Redmer , M Richter , M Ripka , A Rivetti , V Rodin , M Rolo , G Rong , Ch Rosner , A Sarantsev , M Savrié , K Schoenning , W Shan , X Y Shan , M Shao , C P Shen , P X Shen , X Y Shen , H Y Sheng , X Shi , J J Song , X Y Song , S Sosio , C Sowa , S Spataro , G X Sun , J F Sun , L Sun , S S Sun , X H Sun , Y J Sun , Y K Sun , Y Z Sun , Z J Sun , Z T Sun , Y T Tan , C J Tang , G Y Tang , X Tang , B Tsednee , I Uman , B Wang , D Wang , D Y Wang , K Wang , L L Wang , L S Wang , M Wang , Meng Wang , P Wang , P L Wang , W P Wang , X L Wang , Y Wang , Y F Wang , Z Wang , Z G Wang , Z Y Wang , Zongyuan Wang , T Weber , D H Wei , P Weidenkaff , S P Wen , U Wiedner , M Wolke , L H Wu , L J Wu , Z Wu , L Xia , Y Xia , S Y Xiao , Y J Xiao , Z J Xiao , Y G Xie , Y H Xie , X A Xiong , Q L Xiu , G F Xu , J J Xu , L Xu , Q J Xu , X P Xu , F Yan , L Yan , W B Yan , W C Yan , Y H Yan , H J Yang , H X Yang , L Yang , R X Yang , Y H Yang , Y X Yang , Yifan Yang , Z Q Yang , M Ye , M H Ye , J H Yin , Z Y You , B X Yu , C X Yu , J S Yu , C Z Yuan , Y Yuan , A Yuncu , A A Zafar , Y Zeng , B X Zhang , B Y Zhang , C C Zhang , D H Zhang , H H Zhang , H Y Zhang , J Zhang , J L Zhang , J Q Zhang , J W Zhang , J Y Zhang , J Z Zhang , K Zhang , L Zhang , T J Zhang , X Y Zhang , Y Zhang , Y H Zhang , Y T Zhang , Yang Zhang , Yao Zhang , Yi Zhang , Z H Zhang , Z P Zhang , Z Y Zhang , G Zhao , J W Zhao , J Y Zhao , J Z Zhao , Lei Zhao , Ling Zhao , M G Zhao , Q Zhao , S J Zhao , T C Zhao , Y B Zhao , Z G Zhao , A Zhemchugov , B Zheng , J P Zheng , Y H Zheng , B Zhong , L Zhou , Q Zhou , X Zhou , X K Zhou , X R Zhou , Xiaoyu Zhou , Xu Zhou , A N Zhu , J Zhu , K Zhu , K J Zhu , S H Zhu , W J Zhu , X L Zhu , Y C Zhu , Y S Zhu , Z A Zhu , J Zhuang , B S Zou , J H Zou PHYSICAL REVIEW LETTERS（2019）
摘要
We present the first amplitude analysis of the decay D-s(+) -> pi(+)pi(0)eta. We use an e(+)e(-) collision data sample corresponding to an integrated luminosity of 3.19 fb(-1) collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. We observe for the first time the W-annihilation dominant decays D-s(+) -> a(0)(980)(+)pi(0) and D-s(+) -> a(0)(980)(0)pi(+). We measure the absolute branching fraction B(D-s(+) -> a(0)(980)(+(0))pi(0(+)), a(0)(980)(+(0)) -> pi(+(0))eta = (1.46 +/- 0.15(stat) +/- 0.23 sys)%, which is larger than the branching fractions of other measured pure W-annihilation decays by at least one order of magnitude. In addition, we measure the branching fraction of D-s(+) -> pi(+)pi(0)eta with significantly improved precision.
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