Observation of Transverse Λ/Λ¯ Hyperon Polarization in e+e− Annihilation at Belle

Observation of Transverse Λ/Λ¯ 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,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,Belle Collaboration;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;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;Belle Collaboration;
physical review letters 2019 Vol. 122 pp. 042001-
162
collaboration2019physicalobservation

Abstract

We report the first observation of the spontaneous polarization of Λ and Λ¯ 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¯ production, we also report results with subtracted feed-down contributions from Σ0 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¯ hyperon.

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ID: 271608
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10.1103/physrevlett.122.042001
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