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

• Published in: Physical review letters 2011-08, Vol.107 (7), p.072004-072004, Article 072004
• Main Authors: 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, Gaur, V, Gabyshev, N, Garmash, A, Golob, B, Perdekamp, M Grosse, Haba, J, Hayasaka, K, Horii, Y, Hoshi, Y, Hou, W-S, Hyun, H J, Inami, K, Ishikawa, A, Iwabuchi, M, Iwasaki, Y, Iwashita, T, Joshi, N J, Kichimi, H, Kim, H O, Kim, M J, Ko, B R, Kumita, T, Lange, J S, Lee, M J, Lee, S-H, Leitgab, M, Li, Y, Liu, C, Liventsev, D, Louvot, R, McOnie, S, Miyata, H, Miyazaki, Y, Mizuk, R, Mohanty, G B, Nakano, E, Nishida, S, Nitoh, O, Ogawa, A, Ohshima, T, Okuno, S, Pakhlova, G, Park, H, Park, H K, Petrič, M, Piilonen, L E, Ryu, S, Sahoo, H, Sakai, Y, Schneider, O, Schwanda, C, Seon, O, Shapkin, M, Shebalin, V, Shibata, T-A, Shiu, J-G, Smerkol, P, Sohn, Y-S, Solovieva, E, Stanič, S, Starič, M, Sumihama, M, Sumiyoshi, T, Teramoto, Y, Uchida, M, Uehara, S, Uglov, T, Unno, Y, Uno, S, Varner, G, Vinokurova, A, Wang, C H, Wang, M-Z, Wang, P, Watanabe, Y, Won, E, Yabsley, B D, Yamashita, Y, Zhilich, V, Zhou, P, Zhulanov, V
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.107.072004

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 672 fb(-1) data sample that contains 711 × 10(6) 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.