Measurement of $\Lambda$ baryon polarization in $e^+e^-\rightarrow\Lambda\bar\Lambda$ at $\sqrt{s} = 3.773$ GeV

Ablikim, Medina; Achasov, Mikhail N; Adlarson, Patrik Adlarsson; Ahmed, Samer Ali Nasher; Albrecht, Malte; Aliberti, Riccardo; Amoroso, Antonio; An, Meiru; An, Qi; Bai, Xuhong

doi:10.1103/PhysRevD.105.L011101

Measurement of $\Lambda$ baryon polarization in $e^+e^-\rightarrow\Lambda\bar\Lambda$ at $\sqrt{s} = 3.773$ GeV

BESIII

Collaboration

Nov 23, 2021

8 pages

Published in:

Phys.Rev.D 105 (2022) 1, L011101

Published: Jan 1, 2022

e-Print:

2111.11742 [hep-ex]

DOI:

10.1103/PhysRevD.105.L011101 (publication)

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

pdf

reference search36 citations

Citations per year

Abstract: (APS)

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^{-} \to Λ \bar{Λ}

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 \bar{Λ}

helicity states. This phase can be interpreted in terms of psionic form factors, and is determined to be

Δ Φ^{Ψ} = Φ_{E}^{Ψ} - Φ_{M}^{Ψ} = (7 1_{- 46}^{+ 66} \pm 5) °

. Similarly, the ratio between the form factors is found to be

R^{ψ} = | G_{E}^{Ψ} / G_{M}^{Ψ} | = 0.4 8_{- 0.35}^{+ 0.21} \pm 0.03

. The first uncertainties are statistical and the second systematic.

Note:

8 pages, 9 figures, consistent with paper published in Phys. Rev. D (Letter) 105, L011101 (2022)

electron positron: annihilation
electron positron: colliding beams
Lambda: pair production
spin: polarization
baryon: polarization
Lambda: spin
Lambda: polarization
polarization: measured
form factor: ratio
Beijing Stor

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Measurement of Λ\LambdaΛ baryon polarization in e+e−→ΛΛˉe^+e^-\rightarrow\Lambda\bar\Lambdae+e−→ΛΛˉ at s=3.773\sqrt{s} = 3.773s​=3.773 GeV

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Measurement of $\Lambda$ baryon polarization in $e^+e^-\rightarrow\Lambda\bar\Lambda$ at $\sqrt{s} = 3.773$ GeV