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arxiv: 1501.01137 · v6 · submitted 2015-01-06 · ✦ hep-ex

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Measurements of the Upsilon(10860) and Upsilon(11020) resonances via σ(e^+e^-rightarrowUpsilon(n{rm S})π^+π^-)

Belle Collaboration: D. Santel , K. Kinoshita , P. Chang , A. Abdesselam , I. Adachi , H. Aihara , S. Al Said , K. Arinstein
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D. M. Asner T. Aushev R. Ayad A. M. Bakich V. Bansal B. Bhuyan A. Bobrov A. Bondar G. Bonvicini M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian B. G. Cheon K. Chilikin K. Cho V. Chobanova S.-K. Choi Y. Choi D. Cinabro J. Dalseno M. Danilov J. Dingfelder Z. Dole\v{z}al Z. Dr\'asal A. Drutskoy S. Eidelman H. Farhat J. E. Fast T. Ferber V. Gaur N. Gabyshev A. Garmash D. Getzkow R. Gillard Y. M. Goh J. Haba T. Hara K. Hayasaka H. Hayashii X. H. He W.-S. Hou H. J. Hyun T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle D. Joffe T. Julius K. H. Kang E. Kato T. Kawasaki C. Kiesling D. Y. Kim H. J. Kim J. B. Kim J. H. Kim M. J. Kim S. H. Kim Y. J. Kim B. R. Ko P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny A. Kuzmin J. S. Lange I. S. Lee Y. Li L. Li Gioi J. Libby D. Liventsev P. Lukin D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty A. Moll T. Mori R. Mussa E. Nakano M. Nakao T. Nanut Z. Natkaniec N. K. Nisar S. Nishida S. Ogawa S. Okuno S. L. Olsen C. Oswald P. Pakhlov G. Pakhlova C. W. Park H. Park T. K. Pedlar M. Petri\v{c} L. E. Piilonen E. Ribe\v{z}l M. Ritter A. Rostomyan S. Ryu Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz K. Senyo M. E. Sevior V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon Y.-S. Sohn E. Solovieva M. Stari\v{c} M. Steder U. Tamponi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno C. Van Hulse P. Vanhoefer G. Varner A. Vinokurova M. N. Wagner P. Wang X. L. Wang M. Watanabe Y. Watanabe E. Won J. Yamaoka Y.-P. Yang S. Yashchenko Y. Yook Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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classification ✦ hep-ex
keywords upsilonmeasurementsgammareportbellecomponentcrossdetector
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We report new measurements of the total cross sections for $e^+e^-\to \Upsilon(n{\rm S})\pi^+\pi^-$ ($n$ = 1, 2, 3) and $e^+e^-\to b\bar b$ from a high-luminosity fine scan of the region $\sqrt{s} = 10.63$-$11.05$ GeV with the Belle detector. We observe that the $\Upsilon(n{\rm S})\pi^+\pi^-$ spectra have little or no non-resonant component and extract from them the masses and widths of $\Upsilon(10860)$ and $\Upsilon(11020)$ and their relative phase. We find $M_{10860}=(10891.1\pm3.2^{+0.6}_{-1.7})$ MeV/$c^2$ and $\Gamma_{10860}=(53.7^{+7.1}_{-5.6}\,^{+1.3}_{-5.4})$ MeV and report first measurements $M_{11020}=(10987.5^{+6.4}_{-2.5}\,^{+9.0}_{-2.1})$ MeV/$c^2$, $\Gamma_{11020}=(61^{+9}_{-19}\,^{+2}_{-20})$ MeV, and $\phi_{\rm 11020}-\phi_{\rm 10860} = (-1.0\pm0.4\,^{+1.4}_{-0.1})$ rad.

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