Observation of Transverse Λ / Λ Hyperon Polarization in e+e- Annihilation at Belle
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2019-01-01
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Physical Review Letters
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AMER PHYSICAL SOC
Melbourne Authors
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School of Physics
Architecture Building and Planning
Architecture Building and Planning
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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. ,... Lange, J. S. (2019). Observation of Transverse Λ / Λ Hyperon Polarization in e+e- Annihilation at Belle. Physical Review Letters, 122 (4), https://doi.org/10.1103/PhysRevLett.122.042001.
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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.