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Since the first surprising results on the spin structure of the proton by theEMC experiment in the late 1980s, much progress has been made in understandingthe origin of the proton spin. However, the sea quark contribution to theproton spin, for example, the helicity distributions of the strange quark(anti-quark), $s(\bar{s})$, is still not well constrained by experimental data.Since the $s(\bar{s})$ is expected to carry a substantial fraction of the spinof the $\Lambda(\bar{\Lambda})$ hyperon, measurements of the longitudinal spintransfer, $D_{LL}$, of the $\Lambda(\bar{\Lambda}$) hyperon can thus shed lighton the helicity distribution of the $s(\bar{s})$ and the longitudinallypolarized fragmentation functions. In these proceedings, we will present thestatus of the $\Lambda(\bar{\Lambda}$) $D_{LL}$ analysis using data collectedat RHIC-STAR in 2015, for the pseudo-rapidity $|\eta| < 1.2$ and transversemomenta up to $8.0$ GeV$/c$. The $D_{LL}$ as a function of the longitudinalmomentum fraction of the $\Lambda(\bar{\Lambda})$ hyperon in the jet is alsoinvestigated. This data set is about twice as large as the 2009 data used forthe previously published $D_{LL}$ results.

Measurement of longitudinal spin transfer of the $\Lambda(\bar\Lambda)$ hyperon in polarized p+p collisions at $\sqrt{s}=200$ GeV at RHIC-STAR