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Observation of transverse polarization asymmetries of charged pion pairs in e+e- annihilation near sqrt s=10.58 GeV

By A. Vossen, R. Seidl, I. Adachi, H. Aihara, T. Aushev, V. Balagura, W. Bartel, M. Bischofberger, A. Bondar, M. Bračko, T. E. Browder, M. -C. Chang, A. Chen, P. Chen, B. G. Cheon, K. Cho, Y. Choi, S. Eidelman, M. Feindt, V. Gaur, N. Gabyshev, A. Garmash, B. Golob, M. Grosse-Perdekamp, J. Haba, K. Hayasaka, Y. Horii, Y. Hoshi, W. -S. Hou, H. J. Hyun, K. Inami, A. Ishikawa, M. Iwabuchi, Y. Iwasaki, T. Iwashita, N. J. Joshi, H. Kichimi, H. O. Kim, M. J. Kim, B. R. Ko, T Kumita, J. S. Lange, M. J. Lee, S. -H. Lee, M. Leitgab, Y. Li, C. Liu, D. Liventsev, R. Louvot, S. McOnie, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, E. Nakano, S. Nishida, O. Nitoh, A. Ogawa, T. Ohshima, S. Okuno, G. Pakhlova, H. Park, H. K. Park, M. Petrič, L. E. Piilonen, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, C. Schwanda, O. Seon, M. Shapkin, V. Shebalin, T. -A. Shibata, J. -G. Shiu, P. Smerkol, Y. -S. Sohn, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, T. Sumiyoshi, Y. Teramoto, M. /Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, G. Varner, A. Vinokurova, C. H. Wang, M. -Z. Wang, P Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamashita, V. Zhilich, P. Zhou and V. Zhulanov

Abstract

The interference fragmentation function translates the fragmentation of a quark with a transverse projection of the spin into an azimuthal asymmetry of two final-state hadrons. In e+e- annihilation the product of two interference fragmentation functions is measured. We report nonzero asymmetries for pairs of charge-ordered pi+pi- pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672 fb-1 data sample that contains 711 \times 106 pi+pi- pairs and was collected at and near the ?(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider.Comment: 19 pages, 5 figures (including publication's supplement file), Submitted to Physical Review Letter

Topics: High Energy Physics - Experiment
Year: 2011
DOI identifier: 10.1103/PhysRevLett.107.072004
OAI identifier: oai:arXiv.org:1104.2425
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