https://doi.org/10.1051/epjconf/202227102008
Λ polarization measurement of the π−p → K0Λ reaction in J-PARC E40 experiment
1 Department of Physics, Tohoku University, Sendai, Miyagi 980-8578, Japan.
2 High Energy Accelerator Research Organization (KEK), Tokai, Ibaraki 319-1106, Japan.
3 Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan.
4 Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
5 Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan.
* e-mail: sakao@lambda.phys.tohoku.ac.jp
Published online: 9 November 2022
We performed the J-PARC E40 experiment to measure the Σp scattering cross sections from 2018 to 2020. Together with the π−p → K+Σ− data, the π−p → K0Λ data were accumulated as a byproduct. The analysis confirmed that Λ could be identified with an S/N ratio of ∼ 2.67. The polarization of Λ(PΛ) was preliminarily derived as 1.009 ± 0.049 for the K0 angular range of 0.7 < cos θK0, CM < 0.8. It is more accurate than the past data [1]. The high polarization enables us to measure not only the differential cross section but also spin observables of the Λp scattering in the future J-PARC experiment.
© The Authors, published by EDP Sciences, 2022
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