arxiv: 1508.06562 · v2 · pith:XSWYZ5SEnew · submitted 2015-08-26 · ✦ hep-ex

Energy scan of the e^+e^- to h_b(nP)π^+π^- (n=1,2) cross sections and evidence for Upsilon(11020) decays into charged bottomonium-like states

Belle Collaboration: R. Mizuk , A. Bondar , I. Adachi , H. Aihara , H. Atmacan , V. Aulchenko , T. Aushev , R. Ayad

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I. Badhrees A. M. Bakich E. Barberio P. Behera V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin V. Chobanova S.-K. Choi Y. Choi D. Cinabro J. Dalseno N. Dash A. Drutskoy S. Eidelman D. Epifanov T. Ferber B. G. Fulsom V. Gaur A. Garmash R. Gillard Y. M. Goh P. Goldenzweig B. Golob D. Greenwald T. Hara H. Hayashii W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa Y. Iwasaki I. Jaegle T. Julius K. H. Kang D. Y. Kim H. J. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kody\v{s} S. Korpar D. Kotchetkov P. Krokovny A. Kuzmin Y.-J. Kwon C. H. Li H. Li L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko H. Miyata G. B. Mohanty A. Moll E. Nakano T. Nanut K. J. Nath K. Negishi M. Niiyama N. K. Nisar S. Nishida S. Ogawa S. Okuno S. L. Olsen Y. Onuki P. Pakhlov G. Pakhlova B. Pal C. W. Park H. Park S. Paul T. K. Pedlar R. Pestotnik M. Petri\v{c} L. E. Piilonen C. Pulvermacher M. Ritter Y. Sakai S. Sandilya T. Sanuki V. Savinov T. Schl\"uter O. Schneider G. Schnell C. Schwanda Y. Seino D. Semmler K. Senyo O. Seon M. E. Sevior V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon E. Solovieva M. Stari\v{c} J. Stypula T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner V. Vorobyev C. H. Wang M.-Z. Wang P. Wang X. L. Wang Y. Watanabe K. M. Williams E. Won J. Yamaoka Y. Yamashita J. Yelton C. Z. Yuan Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc

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Using data collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we measure the energy dependence of the $e^+e^- \to h_b(nP)\pi^+\pi^-$ $(n=1,2)$ cross sections from thresholds up to $11.02\,$GeV. We find clear $\Upsilon(10860)$ and $\Upsilon(11020)$ peaks with little or no continuum contribution. We study the resonant substructure of the $\Upsilon(11020) \to h_b(nP)\pi^+\pi^-$ transitions and find evidence that they proceed entirely via the intermediate isovector states $Z_b(10610)$ and $Z_b(10650)$. The relative fraction of these states is loosely constrained by the current data: the hypothesis that only $Z_b(10610)$ is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only $Z_b(10650)$ is produced is not excluded at a significant level.

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Energy scan of the e^+e^- to h_b(nP)π^+π^- (n=1,2) cross sections and evidence for Upsilon(11020) decays into charged bottomonium-like states

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