Journal
PHYSICAL REVIEW D
Volume 105, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.105.L011101
Keywords
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Funding
- National Key R&D Program of China [2020YFA0406400, 2020YFA0406300]
- National Natural Science [12035013, 12061131003]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- CAS [U1732263, U1832207]
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH040]
- Fundamental Research Funds for the Central Universities [lzujbky-2021-sp24]
- Institute of Nuclear and Particle Physics, Astronomy and Cosmology and Shanghai Key Laboratory for Particle Physics and Cosmology
- ERC [758462]
- European Union [894790]
- German Research Foundation DFG [443159800, CRC 1044, GRK 214]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- National Science and Technology fund
- Olle Engkvist Foundation [200-0605]
- STFC (United Kingdom)
- Knut and Alice Wallenberg Foundation (Sweden) [2016.0157]
- Royal Society, UK [DH140054, DH160214]
- Swedish Research Council
- U.S. Department of Energy [DE-FG02-05ER41374, DE-SC-0012069]
- NSFC [U1732263, U1832207]
- 100 Talents Program of CAS
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In this study, a measurement of A spin polarization in the e+e- -> Lambda(Lambda) over bar process at √s = 3.773 GeV is reported using a data sample of psi(3770) events collected with the BESIII detector at BEPCII. The phase between the transition amplitudes of the Lambda(Lambda) over bar helicity states is found to be zero, and the ratio between the form factors is determined.
Using a data sample of psi(3770) events collected with the BESIII detector at BEPCII corresponding to an integrated luminosity of 2.9 fb-1, we report a measurement of A spin polarization in e+ e- -> Lambda(Lambda) over bar at = root s = 3.773 GeV. The significance of polarization is found to be 2 sigma including the systematic uncertainty, which implies a zero phase between the transition amplitudes of the Lambda(Lambda) over bar helicity states. This phase can be interpreted in terms of psionic form factors, and is determined to be Delta Phi(Psi) = Phi(Psi)(E) - Phi(Psi)(M) = (71(-46)(+66) +/- 5)degrees. Similarly, the ratio between the form factors is found to be R-psi = vertical bar G(E)(Psi)/G(M)(Psi)vertical bar = 0.48(-0.35)(+0.21) +/- 0.03. The first uncertainties are statistical and the second systematic.
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