• Browse all
Longitudinal Spin Transfer to Lambda and anti-Lambda Hyperons in Polarized Proton-Proton Collisions at s**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.D 80 (2009) 111102, 2009.

Abstract (data abstract)
BNL-RHIC. The longitudinal spin transfer, $D_{LL}$, from high energy polarized protons to $\Lambda$ and $\bar{\Lambda}$ hyperons has been measured for the first time in proton-proton collisions at $\sqrt{s} = 200$ GeV with the STAR detector at the Relativistic Heavy Ion Collider. The measurements cover pseudorapidity, $\eta$, in the range $|\eta| < 1.2$ and transverse momenta, $p_{T}$, up to 4 GeV/c. The longitudinal spin transfer is found to be $D_{LL} = -0.03 \pm 0.13(stat) \pm 0.04(syst)$ for inclusive $\Lambda$ and $D_{LL} = -0.12 \pm 0.08(stat) \pm 0.03(syst)$ for inclusive $\bar{\Lambda}$ hyperons with $<\eta>$ and $<p_{T}> = 3.7 GeV/c$. The dependence on $\eta$ and $p_{T}$ is presented. ***Updated $D_{LL}$ values using the new $\alpha_\Lambda=0.732$ published on PDG2020 are also presented in this HEPData entry.***

  • Table (a) from Figure 3

    Data from Fig3.png

    10.17182/hepdata.99048.v2/t1

    The spin transfer $D_{LL}$ to (a) $\Lambda$ and (b) $\bar{\Lambda}$ hyperons produced at positive pseudorapidity with respect to the polarized...

  • Table (b) from Figure 3

    Data from Fig3.png

    10.17182/hepdata.99048.v2/t2

    The spin transfer $D_{LL}$ to (a) $\Lambda$ and (b) $\bar{\Lambda}$ hyperons produced at positive pseudorapidity with respect to the polarized...

  • Table from Figure 4

    Data from Fig4.png

    10.17182/hepdata.99048.v2/t3

    Comparison of $\Lambda$ and $\bar{\Lambda}$ spin transfer $D_{LL}$ in polarized proton-proton collisions at $\sqrt{s} = 200$ GeV for (a) positive...

  • Table (a) from Figure 3 with New $\alpha$

    Data from Fig3_NewAlpha.png

    10.17182/hepdata.99048.v2/t4

    The spin transfer $D_{LL}$ to (a) $\Lambda$ and (b) $\bar{\Lambda}$ hyperons, calculated using the new $\alpha_\Lambda=0.732$ updated on PDG2020, produced...

  • Table (b) from Figure 3 with New $\alpha$

    Data from Fig3_NewAlpha.png

    10.17182/hepdata.99048.v2/t5

    The spin transfer $D_{LL}$ to (a) $\Lambda$ and (b) $\bar{\Lambda}$ hyperons, calculated using the new $\alpha_\Lambda=0.732$ updated on PDG2020, produced...

  • Table from Figure 4 with New $\alpha$

    Data from Fig4_NewAlpha.png

    10.17182/hepdata.99048.v2/t6

    Comparison of $\Lambda$ and $\bar{\Lambda}$ spin transfer $D_{LL}$, calculated using the new $\alpha_\Lambda=0.732$ updated on PDG2020, in polarized proton-proton collisions...

Version 2 modifications: In 2020, PDG updated the alpha_lambda value from 0.642 to 0.732. This value is used to calculate the Lambda polarization in this paper. In this revision the data tables have been updated accordingly.

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.