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arXiv · 1501.01137

Measurements of the $Υ(10860)$ and $Υ(11020)$ resonances via $σ(e^+e^-\rightarrowΥ(n{\rm S})π^+π^-)$

Belle Collaboration·D. Santel·K. Kinoshita·P. Chang·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·T. Aushev·R. Ayad·A. M. Bakich·V. Bansal·B. Bhuyan·A. Bobrov·A. Bondar·G. Bonvicini·M. Bračko·T. E. Browder·D. Červenkov·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. Doležal·Z. Drásal·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. Kodyš·S. Korpar·P. Križan·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
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Abstract

We report new measurements of the total cross sections for $e^+e^-\to Υ(n{\rm S})π^+π^-$ ($n$ = 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 $Υ(n{\rm S})π^+π^-$ spectra have little or no non-resonant component and extract from them the masses and widths of $Υ(10860)$ and $Υ(11020)$ and their relative phase. We find $M_{10860}=(10891.1\pm3.2^{+0.6}_{-1.7})$ MeV/$c^2$ and $Γ_{10860}=(53.7^{+7.1}_{-5.6}\,^{+1.3}_{-5.4})$ MeV and report first measurements $M_{11020}=(10987.5^{+6.4}_{-2.5}\,^{+9.0}_{-2.1})$ MeV/$c^2$, $Γ_{11020}=(61^{+9}_{-19}\,^{+2}_{-20})$ MeV, and $ϕ_{\rm 11020}-ϕ_{\rm 10860} = (-1.0\pm0.4\,^{+1.4}_{-0.1})$ rad.

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Belle Collaboration, D. Santel, K. Kinoshita, P. Chang, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, B. Bhuyan, A. Bobrov, A. Bondar, G. Bonvicini, M. Bračko, T. E. Browder, D. Červenkov, 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. Doležal, Z. Drásal, 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. Kodyš, S. Korpar, P. Križan, 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. 2016-09-19. Measurements of the $Υ(10860)$ and $Υ(11020)$ resonances via $σ(e^+e^-\rightarrowΥ(n{\rm S})π^+π^-)$. https://doi.org/10.1103/physrevd.93.011101

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