Abstract
Measurements of the longitudinal spin transfer,
D_{LL}DLL,
and the transverse spin transfer, D_{TT}DTT,
of the \Lambda(\bar{\Lambda}Λ(Λ‾)
hyperon in polarized pp+pp
collisions are expected to be sensitive to the helicity distribution and
transversity distribution of the s(\bar{s})s(s‾)
quark in proton and the corresponding polarized fragmentation functions.
This contribution presents the new preliminary results of the
\Lambda(\bar{\Lambda}Λ(Λ‾)
D_{LL}DLL
and D_{TT}DTT
using data collected at RHIC-STAR experiment in 2015, with twice larger
statistics than previously published results.
Funder
National Natural Science Foundation of China