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

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. GaurN. 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, V. Zhulanov

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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 π +π - pairs, which indicate a significant interference fragmentation function in this channel. The results are obtained from a 672fb -1 data sample that contains 711×106 π +π - pairs and was collected at and near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e +e - collider.

Original languageEnglish
Article number072004
JournalPhysical review letters
Volume107
Issue number7
DOIs
Publication statusPublished - 2011 Aug 12

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Vossen, A., Seidl, R., Adachi, I., Aihara, H., Aushev, T., Balagura, V., Bartel, W., Bischofberger, M., Bondar, A., Bračko, M., Browder, T. E., Chang, M. C., Chen, A., Chen, P., Cheon, B. G., Cho, K., Choi, Y., Eidelman, S., Feindt, M., ... Zhulanov, V. (2011). Observation of transverse polarization asymmetries of charged pion pairs in e +e - annihilation near √s=10.58GeV. Physical review letters, 107(7), [072004]. https://doi.org/10.1103/PhysRevLett.107.072004