Observation of Transverse Λ/Λ[over ¯] Hyperon Polarization in e^{+}e^{-} Annihilation at Belle.

Y Guan,A Vossen,I Adachi,K Adamczyk,J K Ahn,H Aihara,S Al Said,D M Asner,H Atmacan,V Aulchenko,T Aushev,R Ayad,V Babu,I Badhrees,A M Bakich,V Bansal,P Behera,C Beleño,M Berger,V Bhardwaj,B Bhuyan,T Bilka,J Biswal,A Bobrov,G Bonvicini,A Bozek,M Bračko,T E Browder,L Cao,D Červenkov,P Chang,V Chekelian,A Chen,B G Cheon,K Chilikin,K Cho,S-K Choi,Y Choi,D Cinabro,S Cunliffe,N Dash,S Di Carlo,J Dingfelder,Z Doležal,T V Dong,Z Drásal,S Eidelman,D Epifanov,J E Fast,T Ferber,B G Fulsom,R Garg,V Gaur,N Gabyshev,A Garmash,M Gelb,A Giri,P Goldenzweig,B Golob,E Guido,J Haba,K Hayasaka,H Hayashii,S Hirose,W-S Hou,T Iijima,K Inami,G Inguglia,A Ishikawa,R Itoh,M Iwasaki,Y Iwasaki,W W Jacobs,I Jaegle,H B Jeon,S Jia,Y Jin,D Joffe,K K Joo,T Julius,K H Kang,T Kawasaki,C Kiesling,D Y Kim,H J Kim,J B Kim,K T Kim,S H Kim,K Kinoshita,P Kodyš,S Korpar,D Kotchetkov,P Križan,R Kroeger,P Krokovny,T Kuhr,R Kulasiri,A Kuzmin,Y-J Kwon,J S Lange,I S Lee, S C Lee,L K Li,Y B Li,L Li Gioi,J Libby,D Liventsev,M Lubej,T Luo,M Masuda,T Matsuda,D Matvienko,M Merola,H Miyata,R Mizuk,G B Mohanty,H K Moon,T Mori,R Mussa,M Nakao,T Nanut,K J Nath,Z Natkaniec,M Nayak,M Niiyama,N K Nisar,S Nishida,S Ogawa,S Okuno,H Ono,P Pakhlov,G Pakhlova,B Pal,S Pardi,H Park,S Paul,T K Pedlar,R Pestotnik,L E Piilonen,V Popov,E Prencipe,A Rabusov,A Rostomyan,G Russo,D Sahoo,Y Sakai,M Salehi,S Sandilya,L Santelj,T Sanuki,V Savinov,O Schneider,G Schnell,C Schwanda,R Seidl,Y Seino,K Senyo,O Seon,M E Sevior,V Shebalin,C P Shen,T-A Shibata,J-G Shiu,F Simon,A Sokolov,E Solovieva,M Starič,J F Strube,M Sumihama,T Sumiyoshi,W Sutcliffe,K Suzuki,M Takizawa,U Tamponi,K Tanida,F Tenchini,M Uchida,T Uglov,Y Unno,S Uno,P Urquijo,Y Usov,S E Vahsen,C Van Hulse,R Van Tonder,G Varner,A Vinokurova,V Vorobyev,E Waheed,B Wang,C H Wang,M-Z Wang,P Wang,X L Wang,S Watanuki,E Widmann,E Won,H Ye,J Yelton,J H Yin,C Z Yuan,Y Yusa,Z P Zhang,V Zhilich,V Zhukova,V Zhulanov,A Zupanc

Physical review letters（2019）

Cited 54|Views86

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Abstract

We report the first observation of the spontaneous polarization of Λ and Λ[over ¯] 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/Λ[over ¯] 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/Λ[over ¯] hyperon.

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Key words

hyperon polarization,transverse,<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml

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