Observation of Transverse Λ/Λ[over ¯] Hyperon Polarization in e^{+}e^{-} Annihilation at Belle

Guan Y 1 , Vossen A 1 , Adachi I 2 , Adamczyk K 3 , Ahn JK 4 , Aihara H 5 Show all authors , Al Said S 6 , Asner DM 7 , Atmacan H 8 , Aulchenko V 9 , Aushev T 10 , Ayad R 11 , Babu V 12 , Badhrees I 13 , Bakich AM 14 , Bansal V 15 , Behera P 16 , Beleño C 17 , Berger M 18 , Bhardwaj V 19 , Bhuyan B 20 , Bilka T 21 , Biswal J 22 , Bobrov A 9 , Bonvicini G 23 , Bozek A 3 , Bračko M 22 , Browder TE 24 , Cao L 25 , Červenkov D 21 , Chang P 26 , Chekelian V 27 , Chen A 28 , Cheon BG 29 , Chilikin K 30 , Cho K 31 , Choi SK 32 , Choi Y 33 , Cinabro D 23 , Cunliffe S 34 , Dash N 35 , Di Carlo S 36 , Dingfelder J 37 , Doležal Z 21 , Dong TV 2 , Drásal Z 21 , Eidelman S 9 , Epifanov D 9 , Fast JE 15 , Ferber T 34 , Fulsom BG 15 , Garg R 38 , Gaur V 39 , Gabyshev N 9 , Garmash A 9 , Gelb M 25 , Giri A 40 , Goldenzweig P 25 , Golob B 22 , Guido E 41 , Haba J 2 , Hayasaka K 42 , Hayashii H 43 , Hirose S 44 , Hou WS 26 , Iijima T 44 , Inami K 44 , Inguglia G 34 , Ishikawa A 45 , Itoh R 2 , Iwasaki M 46 , Iwasaki Y 47 , Jacobs WW 48 , Jaegle I 49 , Jeon HB 50 , Jia S 51 , Jin Y 5 , Joffe D 52 , Joo KK 53 , Julius T 54 , Kang KH 50 , Kawasaki T 55 , Kiesling C 27 , Kim DY 56 , Kim HJ 50 , Kim JB 4 , Kim KT 4 , Kim SH 29 , Kinoshita K 57 , Kodyš P 21 , Korpar S 22 , Kotchetkov D 24 , Križan P 22 , Kroeger R 58 , Krokovny P 9 , Kuhr T 59 , Kulasiri R 52 , Kuzmin A 9 , Kwon YJ 60 , Lange JS 61 , Lee IS 29 , Lee SC 50 , Li LK 62 , Li YB 63 , Li Gioi L 27 , Libby J 16 , Liventsev D 47 , Lubej M 22 , Luo T 64 , Masuda M 65 , Matsuda T 66 , Matvienko D 9 , Merola M 67 , Miyata H 42 , Mizuk R 30 , Mohanty GB 12 , Moon HK 4 , Mori T 44 , Mussa R 41 , Nakao M 2 , Nanut T 22 , Nath KJ 20 , Natkaniec Z 3 , Nayak M 47 , Niiyama M 68 , Nisar NK 69 , Nishida S 2 , Ogawa S 70 , Okuno S 71 , Ono H 72 , Pakhlov P 30 , Pakhlova G 30 , Pal B 7 , Pardi S 67 , Park H 50 , Paul S 73 , Pedlar TK 74 , Pestotnik R 22 , Piilonen LE 39 , Popov V 30 , Prencipe E 75 , Rabusov A 73 , Rostomyan A 34 , Russo G 67 , Sahoo D 12 , Sakai Y 2 , Salehi M 59 , Sandilya S 57 , Santelj L 47 , Sanuki T 45 , Savinov V 69 , Schneider O 76 , Schnell G 77 , Schwanda C 78 , Seidl R 79 , Seino Y 42 , Senyo K 80 , Seon O 44 , Sevior ME 54 , Shebalin V 9 , Shen CP 51 , Shibata TA 81 , Shiu JG 26 , Simon F 27 , Sokolov A 82 , Solovieva E 30 , Starič M 22 , Strube JF 15 , Sumihama M 83 , Sumiyoshi T 84 , Sutcliffe W 25 , Suzuki K 18 , Takizawa M 85 , Tamponi U 41 , Tanida K 86 , Tenchini F 54 , Uchida M 81 , Uglov T 30 , Unno Y 29 , Uno S 2 , Urquijo P 54 , Usov Y 9 , Vahsen SE 24 , Van Hulse C 77 , Van Tonder R 25 , Varner G 24 , Vinokurova A 9 , Vorobyev V 9 , Waheed E 54 , Wang B 57 , Wang CH 87 , Wang MZ 26 , Wang P 62 , Wang XL 64 , Watanuki S 45 , Widmann E 18 , Won E 4 , Ye H 34 , Yelton J 49 , Yin JH 62 , Yuan CZ 62 , Yusa Y 42 , Zhang ZP 88 , Zhilich V 9 , Zhukova V 30 , Zhulanov V 9 , Zupanc A 22 , Belle Collaboration

Affiliations 

  • 1 Duke University, Durham, North Carolina 27708
  • 2 SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
  • 3 H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
  • 4 Korea University, Seoul 136-713
  • 5 Department of Physics, University of Tokyo, Tokyo 113-0033
  • 6 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
  • 7 Brookhaven National Laboratory, Upton, New York 11973
  • 8 University of South Carolina, Columbia, South Carolina 29208
  • 9 Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
  • 10 Moscow Institute of Physics and Technology, Moscow Region 141700
  • 11 Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
  • 12 Tata Institute of Fundamental Research, Mumbai 400005
  • 13 King Abdulaziz City for Science and Technology, Riyadh 11442
  • 14 School of Physics, University of Sydney, New South Wales 2006
  • 15 Pacific Northwest National Laboratory, Richland, Washington 99352
  • 16 Indian Institute of Technology Madras, Chennai 600036
  • 17 II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen
  • 18 Stefan Meyer Institute for Subatomic Physics, Vienna 1090
  • 19 Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
  • 20 Indian Institute of Technology Guwahati, Assam 781039
  • 21 Faculty of Mathematics and Physics, Charles University, 121 16 Prague
  • 22 J. Stefan Institute, 1000 Ljubljana
  • 23 Wayne State University, Detroit, Michigan 48202
  • 24 University of Hawaii, Honolulu, Hawaii 96822
  • 25 Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
  • 26 Department of Physics, National Taiwan University, Taipei 10617
  • 27 Max-Planck-Institut für Physik, 80805 München
  • 28 National Central University, Chung-li 32054
  • 29 Hanyang University, Seoul 133-791
  • 30 P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
  • 31 Korea Institute of Science and Technology Information, Daejeon 305-806
  • 32 Gyeongsang National University, Chinju 660-701
  • 33 Sungkyunkwan University, Suwon 440-746
  • 34 Deutsches Elektronen-Synchrotron, 22607 Hamburg
  • 35 Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
  • 36 LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay
  • 37 University of Bonn, 53115 Bonn
  • 38 Panjab University, Chandigarh 160014
  • 39 Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
  • 40 Indian Institute of Technology Hyderabad, Telangana 502285
  • 41 INFN - Sezione di Torino, 10125 Torino
  • 42 Niigata University, Niigata 950-2181
  • 43 Nara Women's University, Nara 630-8506
  • 44 Graduate School of Science, Nagoya University, Nagoya 464-8602
  • 45 Department of Physics, Tohoku University, Sendai 980-8578
  • 46 Osaka City University, Osaka 558-8585
  • 47 High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
  • 48 Indiana University, Bloomington, Indiana 47408
  • 49 University of Florida, Gainesville, Florida 32611
  • 50 Kyungpook National University, Daegu 702-701
  • 51 Beihang University, Beijing 100191
  • 52 Kennesaw State University, Kennesaw, Georgia 30144
  • 53 Chonnam National University, Kwangju 660-701
  • 54 School of Physics, University of Melbourne, Victoria 3010
  • 55 Kitasato University, Tokyo 108-0072
  • 56 Soongsil University, Seoul 156-743
  • 57 University of Cincinnati, Cincinnati, Ohio 45221
  • 58 University of Mississippi, University, Mississippi 38677
  • 59 Ludwig Maximilians University, 80539 Munich
  • 60 Yonsei University, Seoul 120-749
  • 61 Justus-Liebig-Universität Gießen, 35392 Gießen
  • 62 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
  • 63 Peking University, Beijing 100871
  • 64 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
  • 65 Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
  • 66 University of Miyazaki, Miyazaki 889-2192
  • 67 INFN - Sezione di Napoli, 80126 Napoli
  • 68 Kyoto University, Kyoto 606-8502
  • 69 University of Pittsburgh, Pittsburgh, Pennsylvania 15260
  • 70 Toho University, Funabashi 274-8510
  • 71 Kanagawa University, Yokohama 221-8686
  • 72 Nippon Dental University, Niigata 951-8580
  • 73 Department of Physics, Technische Universität München, 85748 Garching
  • 74 Luther College, Decorah, Iowa 52101
  • 75 Forschungszentrum Jülich, 52425 Jülich
  • 76 École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
  • 77 University of the Basque Country UPV/EHU, 48080 Bilbao
  • 78 Institute of High Energy Physics, Vienna 1050
  • 79 RIKEN BNL Research Center, Upton, New York 11973
  • 80 Yamagata University, Yamagata 990-8560
  • 81 Tokyo Institute of Technology, Tokyo 152-8550
  • 82 Institute for High Energy Physics, Protvino 142281
  • 83 Gifu University, Gifu 501-1193
  • 84 Tokyo Metropolitan University, Tokyo 192-0397
  • 85 J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
  • 86 Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
  • 87 National United University, Miao Li 36003
  • 88 University of Science and Technology of China, Hefei 230026
Phys Rev Lett, 2019 Feb 01;122(4):042001.
PMID: 30768311 DOI: 10.1103/PhysRevLett.122.042001

Abstract

We report the first observation of the spontaneous polarization of Λ and Λ[over ¯] 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[over ¯] production, we also report results with subtracted feed-down contributions from Σ^{0} 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[over ¯] hyperon.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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