Journal Article

Study of Υ(10753) decays to π+π−Υ(nS) final states at Belle II

de Sangro, R., Di Canto, A., Hayashii, H., Chirapatpimol, K., Gaur, V., Kinoshita, K., Chilikin, K., Maity, S., Praz, C., Di Capua, F., Gaudino, G., Mirra, M., Uchida, M., Natkaniec, Z., Gruberová, Z., Xu, X. P., De Pietro, G., Dhamija, R., Kindo, H., Fillinger, T., Bianchi, F., Li, C., Paul, S., Kumar, M., Jang, E.-J., Onishchuk, Y., Kumara, K., Nazaryan, G., Ghevondyan, G., Dreyer, S., Maurya, S. K., Bilka, T., Gobbo, B., Junkerkalefeld, H., Narimani Charan, A., Grammatico, T., Tiwary, R., Kovalenko, E., Jackson, P., Lyu, C., Dingfelder, J., Higuchi, T., Casarosa, G., Hernández Villanueva, M., Aversano, M., Giordano, R., Kojima, K., Pakhlova, G., Senyo, K., Svidras, H., Prencipe, E., Otani, F., Pedlar, T. K., Singh, J. B., Sumisawa, K., Banerjee, Sw, Prell, S., Vitale, L., Marcantonio, D., Shan, W., McKenna, J. A., Bae, H., Biswas, D., Kraetzschmar, T. M. G., Ipsita, N., Le Diberder, F. R., Zhukova, V. I., Pardi, S., Zhou, Q. D., Libby, J., Panta, A., Maiti, R., Nayak, M., Yusa, Y., Bessner, M., De Nuccio, M., Pinna Angioni, G., Lee, M. J., Kandra, J., Kuhr, T., Moser, H.-G., Mrvar, M., Vinokurova, A., Nakazawa, Y., Baur, A., Browder, T. E., Shtol, D., N

2024

Overview

A bstract We present an analysis of the process e + e − → π + π − Υ( nS ) (where n = 1, 2, or 3) reconstructed in 19 . 6 fb − 1 of Belle II data during a special run of the SuperKEKB collider at four energy points near the peak of the Υ(10753) resonance. By analyzing the mass distribution of the π + π − Υ( nS ) system and the Born cross sections of the e + e − → π + π − Υ( nS ) process, we report the first observation of Υ(10753) decays to the π + π − Υ(1 S ) and π + π − Υ(2 S ) final states, and find no evidence for decays to π + π − Υ(3 S ). Possible intermediate states in the π + π − Υ(1 S, 2 S ) transitions are also investigated, and no evidence for decays proceeding via the π ∓ Z b ± or f 0 (980)Υ( nS ) intermediate states is found. We measure Born cross sections for the e + e − → π + π − Υ( nS ) process that, combined with results from Belle, obtain the mass and width of Υ(10753) to be (10756 . 6 ± 2 . 7 ± 0 . 9) MeV/ c 2 and (29 . 0 ± 8 . 8 ± 1 . 2) MeV, respectively. The relative ratios of the Born cross sections at the Υ(10753) resonance peak are also reported for the first time.

• Publisher: Springer Berlin Heidelberg,Springer Nature B.V,Springer Nature,SpringerOpen
• Subject: Classical and Quantum Gravitation / Cross-sections / e +-e − Experiments / Elementary Particles / Energy distribution / Exotics / Mass distribution / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Quarkonium / Regular Article - Experimental Physics / Relativity Theory / Resonance / Spectroscopy / String Theory