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Observation of Transverse Λ / Λ Hyperon Polarization in e+e- Annihilation at Belle

  • Y. Guan
  • , A. Vossen
  • , I. Adachi
  • , K. Adamczyk
  • , J. K. Ahn
  • , H. Aihara
  • , S. Al Said
  • , D. M. Asner
  • , H. Atmacan
  • , V. Aulchenko
  • , T. Aushev
  • , R. Ayad
  • , V. Babu
  • , I. Badhrees
  • , A. M. Bakich
  • , V. Bansal
  • , P. Behera
  • , C. Beleño
  • , M. Berger
  • , V. Bhardwaj
  • B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. DoleŽal, T. V. Dong, Z. Drásal, 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, E. Guido, 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, H. J. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. KriŽan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, A. Kuzmin, 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, M. Lubej, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, R. Mussa, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rabusov, A. Rostomyan, G. Russo, D. Sahoo, Y. Sakai, M. Salehi, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, R. Seidl, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, F. Simon, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, K. Suzuki, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, S. E. Vahsen, C. Van Hulse, R. Van Tonder, G. Varner, A. Vinokurova, V. Vorobyev, E. Waheed, B. Wang, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Widmann, E. Won, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov, A. Zupanc
  • Duke University
  • High Energy Accelerator Research Organization (KEK)
  • Indiana University Bloomington
  • KEK and Graduate University for Advanced Studies (Sokendai)
  • Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
  • Korea University
  • University of Tokyo
  • Kind AbdulAziz University
  • University of Tabuk
  • Brookhaven National Laboratory
  • University of South Carolina
  • Budker Institute of Nuclear Physics (SB RAS)
  • Novosibirsk State University
  • Moscow Institute of Physics and Technology
  • Tata Institute of Fundamental Research, Mumbai
  • King Abdulaziz City for Science and Technology
  • University of Sydney
  • Pacific Northwest National Laboratory
  • Indian Institute of Technology Madras
  • Georg-August-Universität Göttingen
  • Stefan Meyer Institut für Subatomare Physik (SMI)
  • Indian Institute of Science Education and Research Mohali
  • Indian Institute of Technology Guwahati
  • Charles University in Prague
  • Jožef Stefan Institute
  • Wayne State University
  • University of Maribor
  • University of Hawaii
  • Humanoid Technologies Lab (H2T)
  • National Taiwan University
  • Max-Planck-Institut für Physik
  • National Central University
  • Hanyang University
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • Korea Institute of Science and Technology Information
  • Gyeongsang National University
  • Sungkyunkwan University
  • Deutsches Elektronen-Synchrotron (DESY)
  • Indian Institute of Technology Bhubaneswar
  • Laboratoire de l'Accélérateur Linéaire
  • Rheinische Friedrich-Wilhelms-Universität Bonn
  • Panjab University
  • Virginia Polytechnic Institute and State University
  • Indian Institute of Technology Hyderabad
  • Univ. of Ljubljana
  • INFN Sez. di Torino
  • Niigata University
  • Nara Women's University
  • Nagoya University
  • Tohoku University
  • Osaka Prefecture University
  • University of Florida
  • Kyungpook National University
  • Beihang University
  • Kennesaw State University
  • Chonnam National University
  • University of Melbourne
  • Kitasato University
  • Soongsil University
  • Univ. of Cincinnati
  • University of Mississippi
  • Ludwig-Maximilians-Universität München
  • Yonsei University
  • Justus-Liebig-Universität Gießen
  • Institute of High Energy Physics Chinese Academy of Science
  • Beijing University
  • Fudan University
  • University of Miyazaki
  • INFN Sezione di Napoli
  • Università degli Studi di Napoli Federico II
  • National Research Nuclear University MEPhI
  • Kyoto University
  • University of Pittsburgh
  • Toho University
  • Kanagawa University
  • Nippon Dental University
  • Luther College, Decorah
  • Forschungszentrum Jülich
  • Technical University of Munich
  • University of Malaya
  • École Polytechnique Fédérale de Lausanne (EPFL)
  • Biodonostia Health Research Institute-CIBERNED-UPV-EHU
  • Basque Foundation for Science
  • Österreichische Akademie der Wissenschaften
  • Riken BNL Research Center
  • Yamagata University
  • Tokyo Institute of Technology
  • Cluster of Excellence E-conversion
  • Institute for High Energy Physics (IHEP)
  • Gifu University
  • Tokyo Metropolitan University
  • Riken
  • Showa Pharmaceutical University
  • Japan Atomic Energy Agency
  • National United University Taiwan
  • University of Science and Technology of China

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

We report the first observation of the spontaneous polarization of Λ and Λ hyperons transverse to the production plane in e+e- annihilation, which is attributed to the effect arising from a polarizing fragmentation function. For inclusive Λ/Λ production, we also report results with subtracted feed-down contributions from Σ0 and charm. This measurement uses a dataset of 800.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV. We observe a significant polarization that rises with the fractional energy carried by the Λ/Λ hyperon.

Original languageEnglish
Article number042001
JournalPhysical Review Letters
Volume122
Issue number4
DOIs
StatePublished - 2019

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