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arXiv · 1806.06203

Observation of $e^+e^-\to\pi^+\pi^-\pi^0\chi_{b1,2}(1P)$ and search for $e^+e^-\to\phi\chi_{b1,2}(1P)$ at $\sqrt{s}=$10.96---11.05 GeV

J. H. Yin·C. Z. Yuan·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·I. Badhrees·S. Bahinipati·A. M. Bakich·V. Bansal·P. Behera·C. Beleno·B. Bhuyan·T. Bilka·J. Biswal·A. Bobrov·A. Bozek·M. Bracko·T. E. Browder·L. Cao·D. Cervenkov·P. Chang·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Cunliffe·N. Dash·S. Di Carlo·J. Dingfelder·Z. Dolezal·T. V. Dong·Z. Drasal·S. Eidelman·D. Epifanov·J. E. Fast·T. Ferber·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·M. Gelb·A. Giri·P. Goldenzweig·B. Golob·J. Haba·K. Hayasaka·H. Hayashii·S. Hirose·W. -S. Hou·T. Iijima·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·I. Jaegle·H. B. Jeon·S. Jia·Y. Jin·D. Joffe·K. K. Joo·T. Julius·K. H. Kang·T. Kawasaki·C. Kiesling·D. Y. Kim·J. B. Kim·K. T. Kim·S. H. Kim·K. Kinoshita·P. Kodys·S. Korpar·D. Kotchetkov·P. Krizan·R. Kroeger·P. Krokovny·T. Kuhr·R. Kulasiri·Y. -J. Kwon·J. S. Lange·I. S. Lee·S. C. Lee·L. K. Li·Y. B. Li·L. Li Gioi·J. Libby·D. Liventsev
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Abstract

We report searches for the processes $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ and $e^+e^-\to\phi\chi_{bJ}$ (J=1,2) based on data samples collected by the Belle experiment at the KEKB collider. We report the first observation of the process $e^+e^-\to (\pi^+\pi^-\pi^0)_{\rm non-\omega}\chi_{b1}$ and first evidence for $e^+e^-\to\omega\chi_{bJ}$ in the vicinity of the $\Upsilon(11020)$ resonance, with center-of-mass energies from 10.96 to 11.05~GeV. The significances for $(\pi^+\pi^-\pi^0)_{\rm non-\omega}\chi_{b1}$ and $\omega\chi_{bJ}$ are greater than $5.3\sigma$ and $4.0\sigma$, respectively. We also investigate the energy dependence of the $e^+e^-\to\pi^+\pi^-\pi^0\chi_{bJ}$ cross section, but we cannot determine whether the contributions are from the $\Upsilon(10860)$ and $\Upsilon(11020)$ resonances or non-resonant continuum processes. The signals for $e^+e^-\to \phi\chi_{bJ}$ are not significant, and the upper limits of the Born cross sections at the 90\% confidence level are $0.7$ and $1.0$~pb for $e^+e^-\to \phi\chi_{b1}$ and $\phi\chi_{b2}$, respectively, for center-of-mass energies from 10.96 to 11.05~GeV.

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J. H. Yin, C. Z. Yuan, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, A. M. Bakich, V. Bansal, P. Behera, C. Beleno, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, A. Bozek, M. Bracko, T. E. Browder, L. Cao, D. Cervenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. Dolezal, T. V. Dong, Z. Drasal, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, S. Hirose, W. -S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, S. Jia, Y. Jin, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, T. Kawasaki, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krizan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, Y. -J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev. 2018-06-16. Observation of $e^+e^-\to\pi^+\pi^-\pi^0\chi_{b1,2}(1P)$ and search for $e^+e^-\to\phi\chi_{b1,2}(1P)$ at $\sqrt{s}=$10.96---11.05 GeV. https://doi.org/10.1103/physrevd.98.091102

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