Speaker
Prof.
鼎煜 邵
(复旦大学)
Description
We study transverse polarization of Λ hyperons in single-inclusive leptonic annihilation. We show that when the transverse momentum of the Λ baryon is measured with respect
to the thrust axis, a transverse momentum dependent factorization formalism is required
and the polarization is generated by the TMD polarizing fragmentation function (TMD PFF).
However, when the transverse momentum of the Λ baryon is measured with respect to the momentum of the initial leptons, a collinear twist-3 formalism is required and the polarization is generated by the intrinsic collinear twist-3 fragmentation function DT. Using the TMD formalism, we demonstrate that the Λ polarization at OPAL and Belle can be described using the twist-2 TMD factorization formalism. Finally, we make a theoretical prediction for this polarization in the collinear twist-3 formalism at Belle.
Primary author
Prof.
鼎煜 邵
(复旦大学)