Measurement of $Λ$ baryon polarization in $e^+e^-\rightarrowΛ\barΛ$ at $\sqrt{s} = 3.773$ GeV
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Ahmed, S.
name: Albrecht, M.
name: Aliberti, R.
name: Amoroso, A.
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name: Ferroli, R. Baldini
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name: Berger, N.
name: Bertani, M.
name: Bettoni, D.
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name: Bloms, J.
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name: Brueggemann, A.
name: Cai, H.
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name: Cao, G. F.
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name: Chang, J. F.
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name: Chelkov, G.
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name: Chen, M. L.
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name: Cibinetto, G.
name: Cossio, F.
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name: Egorov, P.
name: Fan, Y. L.
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name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Feng, J. H.
name: Fritsch, M.
name: Fu, C. D.
name: Gao, H.
name: Gao, Y. N.
name: Gao, Yang
name: Garzia, I.
name: Ge, P. T.
name: Geng, C.
name: Gersabeck, E. M.
name: Gilman, A
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name: Gong, L.
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name: Gradl, W.
name: Greco, M.
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name: Harris, F. A.
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name: Heinz, C. H.
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Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Using a data sample of $ψ(3770)$ events collected with the BESIII detector at BEPCII corresponding to an integrated luminosity of 2.9 fb$^{-1}$, we report a measurement of $Λ$ spin polarization in $e^+e^-\rightarrowΛ\barΛ$ at $\sqrt{s} = 3.773$ GeV. The significance of polarization is found to be 2$σ$ including the systematic uncertainty, which implies a zero phase between the transition amplitudes of the $Λ\barΛ$ helicity states. This phase can be interpreted in terms of psionic form factors, and is determined to be $ΔΦ^Ψ$ = $Φ^Ψ_{E} - Φ^Ψ_{M}$ = $(71^{+66}_{-46}$ $\pm$ 5)$^{\circ}$. Similarly, the ratio between the form factors is found to be $R^ψ$ = $|G^Ψ_{E}/G^Ψ_{M}|$ = $0.48^{+0.12}_{-0.07}$ $\pm$ 0.04. The first uncertainties are statistical and the second systematic.
description: 8 pages, 9 figures, consistent with paper published in Phys. Rev. D (Letter) 105, L011101 (2022)