Observation of Transverse $\Lambda/\bar{\Lambda}$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle

Observation of Transverse $\Lambda/\bar{\Lambda}$ Hyperon Polarization in $e^+e^-$ Annihilation at Belle

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...

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Veröffentlicht in:Physical review letters 2019, Vol.122 (4)
Hauptverfasser: Guan, Y., Vossen, A., Adachi, I., Adamczyk, K., Ahn, J.K., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A.M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Bračko, M., Browder, T.E., Cao, L., Červenkov, D., Chang, P., Chekelian, V., Chen, A., Cheon, B.G., Chilikin, K., Cho, K., Choi, S.-K., Choi, Y., Cinabro, D., Cunliffe, S., Dash, N., Di Carlo, S., Dingfelder, J., Doležal, Z., Dong, T.V., Drásal, Z., Eidelman, S., Epifanov, D., Fast, J.E., Ferber, T., Fulsom, B.G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Golob, B., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hirose, S., Hou, W.-S., Iijima, T., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W.W., Jaegle, I., Jeon, H.B., Jia, S., Jin, Y., Joffe, D., Joo, K.K., Julius, T., Kang, K.H., Kawasaki, T., Kiesling, C., Kim, D.Y., Kim, H.J., Kim, J.B., Kim, K.T., Kim, S.H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kuzmin, A., Kwon, Y.-J., Lange, J.S.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.042001