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Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle

Z. Q. Liu¹⁷, C. P. Shen^36,*, C. Z. Yuan¹⁷, I. Adachi¹³, H. Aihara⁵⁹, D. M. Asner⁴⁶, V. Aulchenko³, T. Aushev²¹, T. Aziz⁵⁴ et al. (Belle Collaboration)

T. Aziz⁵⁴, A. M. Bakich⁵³, A. Bala⁴⁷, K. Belous¹⁹, V. Bhardwaj³⁸, B. Bhuyan¹⁵, M. Bischofberger³⁸, A. Bondar³, G. Bonvicini⁶⁵, A. Bozek⁴², M. Bračko^31,22, J. Brodzicka⁴², T. E. Browder¹², P. Chang⁴¹, V. Chekelian³², A. Chen³⁹, P. Chen⁴¹, B. G. Cheon¹¹, R. Chistov²¹, K. Cho²⁶, V. Chobanova³², S.-K. Choi¹⁰, Y. Choi⁵², D. Cinabro⁶⁵, J. Dalseno^32,55, M. Danilov^21,34, Z. Doležal⁴, Z. Drásal⁴, A. Drutskoy^21,34, D. Dutta¹⁵, K. Dutta¹⁵, S. Eidelman³, D. Epifanov⁵⁹, H. Farhat⁶⁵, J. E. Fast⁴⁶, M. Feindt²⁴, T. Ferber⁶, A. Frey⁹, V. Gaur⁵⁴, N. Gabyshev³, S. Ganguly⁶⁵, R. Gillard⁶⁵, Y. M. Goh¹¹, B. Golob^30,22, J. Haba¹³, K. Hayasaka³⁷, H. Hayashii³⁸, Y. Horii³⁷, Y. Hoshi⁵⁷, W.-S. Hou⁴¹, Y. B. Hsiung⁴¹, H. J. Hyun²⁸, T. Iijima^37,36, K. Inami³⁶, A. Ishikawa⁵⁸, R. Itoh¹³, Y. Iwasaki¹³, D. Joffe²⁵, T. Julius³³, D. H. Kah²⁸, J. H. Kang⁶⁷, T. Kawasaki⁴⁴, C. Kiesling³², H. J. Kim²⁸, J. B. Kim²⁷, J. H. Kim²⁶, K. T. Kim²⁷, M. J. Kim²⁸, Y. J. Kim²⁶, K. Kinoshita⁵, J. Klucar²², B. R. Ko²⁷, P. Kodyš⁴, S. Korpar^31,22, P. Križan^30,22, P. Krokovny³, T. Kuhr²⁴, Y.-J. Kwon⁶⁷, J. S. Lange⁷, S.-H. Lee²⁷, J. Li⁵¹, Y. Li⁶⁴, J. Libby¹⁶, C. Liu⁵⁰, P. Lukin³, D. Matvienko³, K. Miyabayashi³⁸, H. Miyata⁴⁴, R. Mizuk^21,34, G. B. Mohanty⁵⁴, A. Moll^32,55, R. Mussa²⁰, E. Nakano⁴⁵, M. Nakao¹³, H. Nakazawa³⁹, Z. Natkaniec⁴², M. Nayak¹⁶, E. Nedelkovska³², N. K. Nisar⁵⁴, S. Nishida¹³, O. Nitoh⁶², S. Ogawa⁵⁶, S. Okuno²³, S. L. Olsen⁵¹, Y. Onuki⁵⁹, W. Ostrowicz⁴², C. Oswald², P. Pakhlov^21,34, G. Pakhlova²¹, H. Park²⁸, H. K. Park²⁸, T. K. Pedlar⁶⁸, R. Pestotnik²², M. Petrič²², L. E. Piilonen⁶⁴, M. Ritter³², M. Röhrken²⁴, A. Rostomyan⁶, H. Sahoo¹², T. Saito⁵⁸, Y. Sakai¹³, S. Sandilya⁵⁴, D. Santel⁵, T. Sanuki⁵⁸, Y. Sato⁵⁸, V. Savinov⁴⁸, O. Schneider²⁹, G. Schnell^1,14, C. Schwanda¹⁸, R. Seidl⁴⁹, D. Semmler⁷, K. Senyo⁶⁶, O. Seon³⁶, M. E. Sevior³³, M. Shapkin¹⁹, T.-A. Shibata⁶⁰, J.-G. Shiu⁴¹, B. Shwartz³, A. Sibidanov⁵³, F. Simon^32,55, P. Smerkol²², Y.-S. Sohn⁶⁷, A. Sokolov¹⁹, E. Solovieva²¹, M. Starič²², M. Steder⁶, M. Sumihama⁸, T. Sumiyoshi⁶¹, U. Tamponi^20,63, K. Tanida⁵¹, G. Tatishvili⁴⁶, Y. Teramoto⁴⁵, K. Trabelsi¹³, T. Tsuboyama¹³, M. Uchida⁶⁰, S. Uehara¹³, T. Uglov^21,35, Y. Unno¹¹, S. Uno¹³, S. E. Vahsen¹², C. Van Hulse¹, P. Vanhoefer³², G. Varner¹², K. E. Varvell⁵³, V. Vorobyev³, M. N. Wagner⁷, C. H. Wang⁴⁰, M.-Z. Wang⁴¹, P. Wang¹⁷, X. L. Wang⁶⁴, M. Watanabe⁴⁴, Y. Watanabe²³, E. Won²⁷, B. D. Yabsley⁵³, J. Yamaoka¹², Y. Yamashita⁴³, S. Yashchenko⁶, Y. Yook⁶⁷, Y. Yusa⁴⁴, C. C. Zhang¹⁷, Z. P. Zhang⁵⁰, V. Zhilich³, and A. Zupanc²⁴ (Belle Collaboration)

¹University of the Basque Country UPV/EHU, 48080 Bilbao
²University of Bonn, 53115 Bonn
³Budker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090
⁴Faculty of Mathematics and Physics, Charles University, 121 16 Prague
⁵University of Cincinnati, Cincinnati, Ohio 45221
⁶Deutsches Elektronen-Synchrotron, 22607 Hamburg
⁷Justus-Liebig-Universität Gießen, 35392 Gießen
⁸Gifu University, Gifu 501-1193
⁹II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
¹⁰Gyeongsang National University, Chinju 660-701
¹¹Hanyang University, Seoul 133-791
¹²University of Hawaii, Honolulu, Hawaii 96822
¹³High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
¹⁴Ikerbasque, 48011 Bilbao
¹⁵Indian Institute of Technology Guwahati, Assam 781039
¹⁶Indian Institute of Technology Madras, Chennai 600036
¹⁷Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
¹⁸Institute of High Energy Physics, Vienna 1050
¹⁹Institute for High Energy Physics, Protvino 142281
²⁰INFN-Sezione di Torino, 10125 Torino
²¹Institute for Theoretical and Experimental Physics, Moscow 117218
²²J. Stefan Institute, 1000 Ljubljana
²³Kanagawa University, Yokohama 221-8686
²⁴Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
²⁵Kennesaw State University, Kennesaw, Georgia 30144
²⁶Korea Institute of Science and Technology Information, Daejeon 305-806
²⁷Korea University, Seoul 136-713
²⁸Kyungpook National University, Daegu 702-701
²⁹École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
³⁰Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
³¹University of Maribor, 2000 Maribor
³²Max-Planck-Institut für Physik, 80805 München
³³School of Physics, University of Melbourne, Victoria 3010
³⁴Moscow Physical Engineering Institute, Moscow 115409
³⁵Moscow Institute of Physics and Technology, Moscow Region 141700
³⁶Graduate School of Science, Nagoya University, Nagoya 464-8602
³⁷Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602
³⁸Nara Women’s University, Nara 630-8506
³⁹National Central University, Chung-li 32054
⁴⁰National United University, Miao Li 36003
⁴¹Department of Physics, National Taiwan University, Taipei 10617
⁴²H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
⁴³Nippon Dental University, Niigata 951-8580
⁴⁴Niigata University, Niigata 950-2181
⁴⁵Osaka City University, Osaka 558-8585
⁴⁶Pacific Northwest National Laboratory, Richland, Washington 99352
⁴⁷Panjab University, Chandigarh 160014
⁴⁸University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁴⁹RIKEN BNL Research Center, Upton, New York 11973
⁵⁰University of Science and Technology of China, Hefei 230026
⁵¹Seoul National University, Seoul 151-742
⁵²Sungkyunkwan University, Suwon 440-746
⁵³School of Physics, University of Sydney, New South Wales 2006
⁵⁴Tata Institute of Fundamental Research, Mumbai 400005
⁵⁵Excellence Cluster Universe, Technische Universität München, 85748 Garching
⁵⁶Toho University, Funabashi 274-8510
⁵⁷Tohoku Gakuin University, Tagajo 985-8537
⁵⁸Tohoku University, Sendai 980-8578
⁵⁹Department of Physics, University of Tokyo, Tokyo 113-0033
⁶⁰Tokyo Institute of Technology, Tokyo 152-8550
⁶¹Tokyo Metropolitan University, Tokyo 192-0397
⁶²Tokyo University of Agriculture and Technology, Tokyo 184-8588
⁶³University of Torino, 10124 Torino
⁶⁴CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁶⁵Wayne State University, Detroit, Michigan 48202
⁶⁶Yamagata University, Yamagata 990-8560
⁶⁷Yonsei University, Seoul 120-749
⁶⁸Luther College, Decorah, Iowa 52101

^*Present address: Beihang University, Beijing 100191.

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Phys. Rev. Lett. 110, 252002 – Published 17 June, 2013Erratum Phys. Rev. Lett. 111, 019901 (2013)

DOI: https://doi.org/10.1103/PhysRevLett.110.252002

Abstract

The cross section for $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ between 3.8 and 5.5 GeV is measured with a $967 {fb}^{- 1}$ data sample collected by the Belle detector at or near the $Υ (n S)$ ( $n = 1, 2, \dots, 5$ ) resonances. The $Y (4260)$ state is observed, and its resonance parameters are determined. In addition, an excess of $π^{+} π^{-} J / ψ$ production around 4 GeV is observed. This feature can be described by a Breit-Wigner parametrization with properties that are consistent with the $Y (4008)$ state that was previously reported by Belle. In a study of $Y (4260) \to π^{+} π^{-} J / ψ$ decays, a structure is observed in the $M (π^{\pm} J / ψ)$ mass spectrum with $5.2 σ$ significance, with mass $M = (3894.5 \pm 6.6 \pm 4.5) MeV / c^{2}$ and width $Γ = (63 \pm 24 \pm 26) MeV / c^{2}$ , where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state.

Corrections

19 June, 2013

Erratum

Publisher’s Note: Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle [Phys. Rev. Lett. 110, 252002 (2013)]

Z. Q. Liu (Belle Collaboration)

Phys. Rev. Lett. 111, 019901 (2013)

Viewpoint

New Particle Hints at Four-Quark Matter

Published 17 June, 2013

Two experiments have detected the signature of a new particle, which may combine quarks in a way not seen before.

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References (23)

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Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle

Abstract

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Erratum

Publisher’s Note: Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle [Phys. Rev. Lett. 110, 252002 (2013)]

Viewpoint

New Particle Hints at Four-Quark Matter

See Also

Observation of a Charged Charmoniumlike Structure in $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ at $\sqrt{s} = 4.26 GeV$

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Study of e+e−→π+π−J/ψ and Observation of a Charged Charmoniumlike State at Belle

Abstract

Corrections

Erratum

Publisher’s Note: Study of e+e−→π+π−J/ψ and Observation of a Charged Charmoniumlike State at Belle [Phys. Rev. Lett. 110, 252002 (2013)]

Viewpoint

New Particle Hints at Four-Quark Matter

See Also

Observation of a Charged Charmoniumlike Structure in e+e−→π+π−J/ψ at s=4.26 GeV

Article Text

References (23)

Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle

Publisher’s Note: Study of $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ and Observation of a Charged Charmoniumlike State at Belle [Phys. Rev. Lett. 110, 252002 (2013)]

Observation of a Charged Charmoniumlike Structure in $e^{+} e^{-} \to π^{+} π^{-} J / ψ$ at $\sqrt{s} = 4.26 GeV$