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^{+}.

Journal: Physical Review Letters
Published:
Abstract

We present the first amplitude analysis of the decay D_{s}^{+}→π^{+}π^{0}η. 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)^{+}π^{0} and D_{s}^{+}→a_{0}(980)^{0}π^{+}. We measure the absolute branching fraction B(D_{s}^{+}→a_{0}(980)^{+(0)}π^{0^{(}+)},a_{0}(980)^{+(0)}→π^{+(0)}η)=(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}^{+}→π^{+}π^{0}η with significantly improved precision.

Authors
M Ablikim, M Achasov, S Ahmed, M Albrecht, M Alekseev, A Amoroso, F An, Q An, J Bai, Y Bai, O Bakina, R Baldini Ferroli, Y Ban, K Begzsuren, J Bennett, N Berger, M Bertani, D Bettoni, F Bianchi, E Boger, I Boyko, R Briere, H Cai, X Cai, A Calcaterra, G Cao, N Cao, S Cetin, J Chai, J Chang, G Chelkov, G Chen, H Chen, J Chen, M Chen, S Chen, X Chen, Y Chen, W Cheng, X Chu, G Cibinetto, F Cossio, X Cui, H Dai, J Dai, A Dbeyssi, D Dedovich, Z Deng, A Denig, I Denysenko, M Destefanis, F De Mori, Y Ding, C Dong, J Dong, L Dong, M Dong, S Du, J Fang, S Fang, Y Fang, R Farinelli, L Fava, F Feldbauer, G Felici, C Feng, M Fritsch, C Fu, Q Gao, X Gao, Y Gao, Y Gao, Y Gao, Z Gao, B Garillon, I Garzia, A Gilman, K Goetzen, L Gong, W Gong, W Gradl, M Greco, M Gu, Y Gu, A Guo, R Guo, Y Guo, A Guskov, S Han, X Hao, F Harris, K He, X He, F Heinsius, T Held, Y Heng, Y Hou, Z Hou, H Hu, J Hu, T Hu, Y Hu, G Huang, J Huang, X Huang, Z Huang, T Hussain, W Ikegami Andersson, W Imoehl, M Irshad, Q Ji, X Ji, X Ji, X Jiang, X Jiang, J Jiao, Z Jiao, D Jin, S Jin, Y Jin, T Johansson, N Kalantar Nayestanaki, X Kang, R Kappert, M Kavatsyuk, B Ke, I Keshk, T Khan, A Khoukaz, P Kiese, R Kiuchi, R Kliemt, L Koch, O Kolcu, B Kopf, M Kuemmel, M Kuessner, A Kupsc, M Kurth, W Kühn, J Lange, P Larin, L Lavezzi, H Leithoff, C Li, Cheng Li, D Li, F Li, F Li, G Li, H Li, H Li, J Li, J Li, Jin Li, K Li, Kang Li, Ke Li, L Li, Lei Li, P Li, P Li, Q Li, W Li, W Li, X Li, X Li, X Li, Z Li, H Liang, H Liang, Y Liang, Y Liang, G Liao, L Liao, J Libby, C Lin, D Lin, B Liu, B Liu, C Liu, D Liu, D Liu, F Liu, Fang Liu, Feng Liu, H Liu, H Liu, Huihui Liu, J Liu, J Liu, K Liu, Ke Liu, L Liu, Q Liu, S Liu, X Liu, X Liu, Y Liu, Z Liu, Zhiqing Liu, Y Long, X Lou, H Lu, J Lu, Y Lu, C Luo, M Luo, T Luo, X Luo, S Lusso, X Lyu, F Ma, H Ma, L Ma, M Ma, Q Ma, T Ma, X Ma, X Ma, Y Ma, F Maas, M Maggiora, S Maldaner, Q Malik, A Mangoni, Y Mao, Z Mao, S Marcello, Z Meng, J Messchendorp, G Mezzadri, J Min, R Mitchell, X Mo, Y Mo, C Morales, N Muchnoi, H Muramatsu, A Mustafa, Y Nefedov, F Nerling, I Nikolaev, Z Ning, S Nisar, S Niu, X Niu, S Olsen, Q Ouyang, S Pacetti, Y Pan, M Papenbrock, P Patteri, M Pelizaeus, J Pellegrino, H Peng, K Peters, J Pettersson, J Ping, R Ping, A Pitka, R Poling, V Prasad, M Qi, T Qi, S Qian, C Qiao, N Qin, X Qin, Z Qin, J Qiu, S Qu, K Rashid, C Redmer, M Richter, M Ripka, A Rivetti, V Rodin, M Rolo, G Rong, Ch Rosner, A Sarantsev, M Savrié, K Schoenning, W Shan, X Shan, M Shao, C Shen, P Shen, X Shen, H Sheng, X Shi, J Song, X Song, S Sosio, C Sowa, S Spataro, G Sun, J Sun, L Sun, S Sun, X Sun, Y Sun, Y Sun, Y Sun, Z Sun, Z Sun, Y Tan, C Tang, G Tang, X Tang, B Tsednee, I Uman, B Wang, D Wang, K Wang, L Wang, M Wang, Meng Wang, P Wang, W Wang, X Wang, Y Wang, Z Wang, Z Wang, T Weber, D Wei, P Weidenkaff, S Wen, U Wiedner, M Wolke, L Wu, L Wu, Z Wu, L Xia, Y Xia, S Xiao, Y Xiao, Z Xiao, Y Xie, Y Xie, X Xiong, Q Xiu, G Xu, J Xu, L Xu, Q Xu, X Xu, F Yan, L Yan, W Yan, W Yan, Y Yan, H Yang, H Yang, L Yang, R Yang, Y Yang, Y Yang, Yifan Yang, Z Yang, M Ye, M Ye, J Yin, Z You, B Yu, C Yu, J Yu, J Yu, C Yuan, Y Yuan, A Yuncu, A Zafar, Y Zeng, B Zhang, B Zhang, C Zhang, D Zhang, H Zhang, H Zhang, J Zhang, J Zhang, J Zhang, J Zhang, J Zhang, K Zhang, L Zhang, T Zhang, X Zhang, Y Zhang, Y Zhang, Yang Zhang, Yao Zhang, Yi Zhang, Z Zhang, Z Zhang, Z Zhang, G Zhao, J Zhao, J Zhao, J Zhao, Lei Zhao, Ling Zhao, M Zhao, Q Zhao, S Zhao, T Zhao, Y Zhao, Z Zhao, A Zhemchugov, B Zheng, J Zheng, Y Zheng, B Zhong, L Zhou, Q Zhou, X Zhou, X Zhou, X Zhou, Xiaoyu Zhou, Xu Zhou, A Zhu, J Zhu, J Zhu, K Zhu, S Zhu, W Zhu, X Zhu, Y Zhu, Y Zhu, Z Zhu, J Zhuang, B Zou, J Zou