Svenskt kärnfysikermöte 2018 med SFAIR-årsmöte

Observation of spin polarization in e+e−→ΛΛ¯ at BESIII

18 Oct 2018, 09:20

15m

Å80101 (Ångströmlaboratoriet, Uppsala universitet)

Short contribution SFS-KF möte Kärnfysikermöte

Speaker

Dr Cui Li (Uppsala University)

Description

The BESIII collaboration here report the first observation of polarized $\mathrm{\Lambda }$ and $\overline{\mathrm{\Lambda }}$ hyperons produced in two different processes: i) the resonant $e^{+}{e}^{-}\to J/\psi \to \mathrm{\Lambda }\overline{\mathrm{\Lambda }}$, using a data sample of 1.31 $\times$ 10${}^9$ $J/\psi$ events and ii) the non-resonant $e^{+}{e}^{-}\to {\gamma }^{\ast }\to \mathrm{\Lambda }\overline{\mathrm{\Lambda }}$, using a 66.9 pb${}^{-1}$ data sample collected at $\sqrt{s}=$ 2.396 GeV.

Presentation materials

Slides

CuiLi.pdf