APS » Phys. Rev. Lett. » Volume 96 » Issue 23

R. Seidl,³⁵ K. Hasuko,³⁵ K. Abe,⁴³ I. Adachi,⁸ H. Aihara,⁴⁵ D. Anipko,¹ Y. Asano,⁴⁹ T. Aushev,¹² A. M. Bakich,⁴⁰ V. Balagura,¹² E. Barberio,²⁰ W. Bartel,⁵ A. Bay,¹⁷ U. Bitenc,¹³ I. Bizjak,¹³ S. Blyth,²³ A. Bozek,²⁶ M. Brako,^8,19,13 T. E. Browder,⁷ P. Chang,²⁵ A. Chen,²³ B. G. Cheon,³ Y. Choi,³⁹ Y. K. Choi,³⁹ A. Chuvikov,³⁴ J. Dalseno,²⁰ M. Danilov,¹² M. Dash,⁵⁰ J. Dragic,⁸ S. Eidelman,¹ S. Fratina,¹³ N. Gabyshev,¹ T. Gershon,⁸ A. Go,²³ G. Gokhroo,⁴¹ B. Golob,^18,13 A. Goriek,¹³ M. Grosse Perdekamp,³⁵ H. C. Ha,¹⁵ K. Hayasaka,²¹ H. Hayashii,²² M. Hazumi,⁸ T. Hokuue,²¹ Y. Hoshi,⁴³ S. Hou,²³ W.-S. Hou,²⁵ T. Iijima,²¹ K. Inami,²¹ A. Ishikawa,⁸ R. Itoh,⁸ M. Iwasaki,⁴⁵ Y. Iwasaki,⁸ J. H. Kang,⁵¹ P. Kapusta,²⁶ N. Katayama,⁸ H. Kawai,² T. Kawasaki,²⁸ H. R. Khan,⁴⁶ H. Kichimi,⁸ S. K. Kim,³⁷ S. M. Kim,³⁹ R. Kulasiri,⁴ R. Kumar,³² C. C. Kuo,²³ A. Kuzmin,¹ Y.-J. Kwon,⁵¹ J. S. Lange,⁶ J. Lee,³⁷ T. Lesiak,²⁶ J. Li,³⁶ A. Limosani,⁸ S.-W. Lin,²⁵ D. Liventsev,¹² F. Mandl,¹⁰ T. Matsumoto,⁴⁷ A. Matyja,²⁶ W. Mitaroff,¹⁰ H. Miyake,³¹ H. Miyata,²⁸ Y. Miyazaki,²¹ R. Mizuk,¹² T. Mori,⁴⁶ I. Nakamura,⁸ E. Nakano,³⁰ M. Nakao,⁸ Z. Natkaniec,²⁶ S. Nishida,⁸ O. Nitoh,⁴⁸ A. Ogawa,³⁵ S. Ogawa,⁴² T. Ohshima,²¹ T. Okabe,²¹ S. Okuno,¹⁴ S. L. Olsen,⁷ H. Ozaki,⁸ P. Pakhlov,¹² H. Palka,²⁶ C. W. Park,³⁹ H. Park,¹⁶ N. Parslow,⁴⁰ L. S. Peak,⁴⁰ R. Pestotnik,¹³ L. E. Piilonen,⁵⁰ Y. Sakai,⁸ N. Sato,²¹ N. Satoyama,³⁸ T. Schietinger,¹⁷ O. Schneider,¹⁷ J. Schümann,²⁵ K. Senyo,²¹ M. E. Sevior,²⁰ M. Shapkin,¹¹ H. Shibuya,⁴² A. Somov,⁴ N. Soni,³² R. Stamen,⁸ S. Stani,²⁹ M. Stari,¹³ K. Sumisawa,³¹ F. Takasaki,⁸ K. Tamai,⁸ M. Tanaka,⁸ G. N. Taylor,²⁰ Y. Teramoto,³⁰ X. C. Tian,³³ T. Tsukamoto,⁸ S. Uehara,⁸ T. Uglov,¹² S. Uno,⁸ P. Urquijo,²⁰ Y. Usov,¹ G. Varner,⁷ S. Villa,¹⁷ C. C. Wang,²⁵ C. H. Wang,²⁴ Y. Watanabe,⁴⁶ E. Won,¹⁵ Q. L. Xie,⁹ B. D. Yabsley,⁴⁰ A. Yamaguchi,⁴⁴ Y. Yamashita,²⁷ M. Yamauchi,⁸ J. Ying,³³ Y. Yusa,⁵⁰ L. M. Zhang,³⁶ Z. P. Zhang,³⁶ V. Zhilich,¹ and D. Zürcher¹⁷

(Belle Collaboration)

¹Budker Institute of Nuclear Physics, Novosibirsk
²Chiba University, Chiba
³Chonnam National University, Kwangju
⁴University of Cincinnati, Cincinnati, Ohio 45221
⁵Deutsches Elektronen-Synchrotron, Hamburg
⁶University of Frankfurt, Frankfurt
⁷University of Hawaii, Honolulu, Hawaii 96822
⁸High Energy Accelerator Research Organization (KEK), Tsukuba
⁹Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
¹⁰Institute of High Energy Physics, Vienna
¹¹Institute of High Energy Physics, Protvino
¹²Institute for Theoretical and Experimental Physics, Moscow
¹³J. Stefan Institute, Ljubljana
¹⁴Kanagawa University, Yokohama
¹⁵Korea University, Seoul
¹⁶Kyungpook National University, Taegu
¹⁷Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
¹⁸University of Ljubljana, Ljubljana
¹⁹University of Maribor, Maribor
²⁰University of Melbourne, Victoria
²¹Nagoya University, Nagoya
²²Nara Women's University, Nara
²³National Central University, Chung-li
²⁴National United University, Miao Li
²⁵Department of Physics, National Taiwan University, Taipei
²⁶H. Niewodniczanski Institute of Nuclear Physics, Krakow
²⁷Nippon Dental University, Niigata
²⁸Niigata University, Niigata
²⁹Nova Gorica Polytechnic, Nova Gorica
³⁰Osaka City University, Osaka
³¹Osaka University, Osaka
³²Panjab University, Chandigarh
³³Peking University, Beijing
³⁴Princeton University, Princeton, New Jersey 08544
³⁵RIKEN BNL Research Center, Upton, New York 11973
³⁶University of Science and Technology of China, Hefei
³⁷Seoul National University, Seoul
³⁸Shinshu University, Nagano
³⁹Sungkyunkwan University, Suwon
⁴⁰University of Sydney, Sydney NSW
⁴¹Tata Institute of Fundamental Research, Bombay
⁴²Toho University, Funabashi
⁴³Tohoku Gakuin University, Tagajo
⁴⁴Tohoku University, Sendai
⁴⁵Department of Physics, University of Tokyo, Tokyo
⁴⁶Tokyo Institute of Technology, Tokyo
⁴⁷Tokyo Metropolitan University, Tokyo
⁴⁸Tokyo University of Agriculture and Technology, Tokyo
⁴⁹University of Tsukuba, Tsukuba
⁵⁰Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁵¹Yonsei University, Seoul

The Collins effect connects transverse quark spin with a measurable azimuthal dependence in the yield of hadronic fragments around the quark's momentum vector. Using two different reconstruction methods, we find evidence of statistically significant azimuthal asymmetries for charged pion pairs in e⁺e^- annihilation at a center-of-mass energy of 10.52 GeV, which can be attributed to a transverse polarization of the primordial quarks. The measurement was performed using a sample of 79×10⁶ hadronic events collected with the Belle detector.

©2006 The American Physical Society

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