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Guan, Y; Adachi, I; Ahn, J K; Aihara, H; Al Said, S; Atmacan, H; Aulchenko, V; Bakich, A M; Bansal, V; Behera, P; Berger, M; Bhuyan, B; Bozek, A; Bračko, M; Browder, T E; Chekelian, V; Chilikin, K; Choi, S-K; Choi, Y; Cinabro, D; Dingfelder, J; Dong, T V; Drásal, Z; Epifanov, D; Fast, J E; Fulsom, B G; Gaur, V; Gabyshev, N; Garmash, A; Gelb, M; Hirose, S; Hou, W-S; Inami, K; Ishikawa, A; Itoh, R; Iwasaki, M; Iwasaki, Y; Jeon, H B; Jia, S; Joffe, D; Joo, K K; Kiesling, C; Kim, J B; Kim, K T; Kim, S H; Kotchetkov, D; Križan, P; Kroeger, R; Kuhr, T; Kulasiri, R; Lange, J S; Lee, I S; Li, Y B; Liventsev, D; Lubej, M; Masuda, M; Matsuda, T; Miyata, H; Mizuk, R; Moon, H K; Mori, T; Mussa, R; Nakao, M; Nanut, T; Nath, K J; Natkaniec, Z; Pakhlov, P; Pal, B; Pedlar, T K; Piilonen, L E; Rostomyan, A; Sahoo, D; Sakai, Y; Salehi, M; Sandilya, S; Santelj, L; Savinov, V; Schnell, G; Schwanda, C; Seidl, R; Seino, Y; Sevior, M E; Shebalin, V; Shibata, T-A; Sokolov, A; Sutcliffe, W; Tamponi, U; Uchida, M; Uglov, T; Unno, Y; Uno, S; Vahsen, S E; Varner, G; Vinokurova, A; Wang, C H; Ye, H; Yusa, Y; Zhang, Z P; Zhilich, V; Zupanc, A
Physical review letters, 2019-Feb-01, Volume: 122, Issue: 4Journal Article
We report the first observation of the spontaneous polarization of Λ and Λover ¯ 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/Λover ¯ 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/Λover ¯ hyperon.
