TY - JOUR

T1 - Measurement of Λ transverse polarization in e+e− collisions at $$ \sqrt{s} $$ = 3.68 − 3.71 GeV

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Nikolaev, I. b.

AU - Мучной, Николай Юрьевич

PY - 2023/10/13

Y1 - 2023/10/13

N2 - With data samples collected with the BESIII detector at seven energy points at = 3.68 − 3.71 GeV, corresponding to an integrated luminosity of 333 pb−1, we present a study of the Λ transverse polarization in the e+e− → reaction. The significance of polarization by combining the seven energy points is found to be 2.6σ including the systematic uncertainty, which implies a non-zero phase between the transition amplitudes of the helicity states. The modulus ratio and the relative phase of EM-psionic form factors combined with all energy points are measured to be RΨ = ± 0.03 and ∆ΦΨ = ± 1.6°, where the first uncertainties are statistical and the second systematic.

AB - With data samples collected with the BESIII detector at seven energy points at = 3.68 − 3.71 GeV, corresponding to an integrated luminosity of 333 pb−1, we present a study of the Λ transverse polarization in the e+e− → reaction. The significance of polarization by combining the seven energy points is found to be 2.6σ including the systematic uncertainty, which implies a non-zero phase between the transition amplitudes of the helicity states. The modulus ratio and the relative phase of EM-psionic form factors combined with all energy points are measured to be RΨ = ± 0.03 and ∆ΦΨ = ± 1.6°, where the first uncertainties are statistical and the second systematic.

U2 - 10.1007/JHEP10(2023)081

DO - 10.1007/JHEP10(2023)081

M3 - Article

VL - 2023

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 10

ER -