Measurement of the transverse polarization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Λ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi mathvariant="normal">Λ</mml:mi><mml:mo accent="true" stretchy="false">¯</mml:mo></mml:mover></mml:math>hyperons produced in proton-proton collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math>using the ATLAS detector

The transverse polarization of $\mathrm{\ensuremath{\Lambda}}$ and $\overline{\mathrm{\ensuremath{\Lambda}}}$ hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses $760\text{ }\text{ }\ensuremath{\mu}{\mathrm{b}}^{\ensuremath{-}1}$ of minimum bias data collected by the ATLAS detector at the LHC in the year 2010. The measured transverse polarization averaged over Feynman ${x}_{\mathrm{F}}$ from $5\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}5}$ to 0.01 and transverse momentum ${p}_{\mathrm{T}}$ from 0.8 to 15 GeV is $\ensuremath{-}0.010\ifmmode\pm\else\textpm\fi{}0.005(\text{stat})\ifmmode\pm\else\textpm\fi{}0.004(\text{syst})$ for $\mathrm{\ensuremath{\Lambda}}$ and $0.002\ifmmode\pm\else\textpm\fi{}0.006(\text{stat})\ifmmode\pm\else\textpm\fi{}0.004(\text{syst})$ for $\overline{\mathrm{\ensuremath{\Lambda}}}$. It is also measured as a function of ${x}_{\mathrm{F}}$ and ${p}_{\mathrm{T}}$, 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 ${x}_{\mathrm{F}}$ range covered by this measurement.

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