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Measurement of the transverse polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons produced in proton-proton collisions at $\sqrt{s}=7$ TeV using the ATLAS detector

The ATLAS collaboration
Phys.Rev. D91 (2015) 032004, 2015

Abstract (data abstract)
CERN-LHC. The transverse polarization of LAMBDA and LAMBDABAR hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses $760 \mu{}b^{-1}$ of minimum bias data collected by the ATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged over Feynman xF from $5 \times 10^{-5}$ to 0.01 and transverse momentum pT from 0.8 to 15 GeV is $-0.010 \pm 0.005(stat) \pm 0.004(syst)$ for LAMBDA and $0.002 \pm 0.006(stat) \pm 0.004(syst)$ for LAMBDABAR. It is also measured as a function of xF and pT, but no significant dependence on these variables is observed. Prior to this measurement, the polarization was measured at fixed-target experiments with center-of-mass energies up to about 40 GeV. The ATLAS results are compatible with the extrapolation of a fit from previous measurements to the xF range covered by this measurement.

  • Table 1

    Data from Page 8 of preprint

    10.17182/hepdata.66547.v1/t1

    Transverse polarization POL of LAMBDA and LAMBDABAR hyperons averaged over PT and XF.

  • Table 2

    Data from Figure 6a

    10.17182/hepdata.66547.v1/t2

    Transverse polarization POL of LAMBDA and LAMBDABAR hyperons as a function of XF.

  • Table 3

    Data from Figure 6b

    10.17182/hepdata.66547.v1/t3

    Transverse polarization POL of LAMBDA and LAMBDABAR hyperons as a function of PT.

  • Table 4

    Data from Figure 7

    10.17182/hepdata.66547.v1/t4

    The LAMBDA reconstruction and selection efficiency EFF as a function of PT and XF.

  • Table 5

    Data from Aux. Figure 8

    10.17182/hepdata.66547.v1/t5

    The LAMBDABAR reconstruction and selection efficiency EFF as a function of PT and XF.

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