Apr 16 – 20, 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

Production of transversely polarized $\Lambda$ hyperon from unpolarized quark fragmentation in the diquark model

Apr 18, 2018, 3:10 PM


WG6: Spin and 3D structure WG6: Spin and 3D structure


Mr Yongliang Yang (Southeast University)


We investigate the spin-dependent (naive) T-odd fragmentation function $D^\perp_{1T}$, which can provide an explanation on the transverse polarization of the $\Lambda^0$ hyperon produced in an unpolarized process. We calculate $D^\perp_{1T}$ for light flavors in the spectator diquark model, with a Gaussian form factor at the hyperon-quark-diquark vertex. We include in the calculation both the scalar diquark and axial-vector diquark spectators. We determine the values of the model parameters by fitting the unpolarized fragmentation function $D^\Lambda_1$ to the DSV parametrization for $D^\Lambda_1$. In addition, we compute the longitudinal polarization fragmentation function $G^\Lambda_1$ and compare it with the known parametrization of $G^\Lambda_1$. We also estimate the transverse polarizations of $\Lambda$ production, in both semi-inclusive deep inelastic scattering and single inclusive $e^+e^-$ annihilation.

Primary authors

Mr Yongliang Yang (Southeast University) Prof. Zhun Lu (Southeast University) Prof. Ivan Schmidt (Universidad Tecnica Federico Santa Maria)

Presentation materials