Measurement of the transverse polarization of Λ and Λ ¯ hyperons produced in proton-proton collisions at √s=7 TeV using the ATLAS detector

ATLAS, Collaboration; Agustoni, Marco; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Marti, Lukas; Meloni, Federico; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Measurement of the transverse polarization of Λ and Λ ¯ hyperons produced in proton-proton collisions at √s=7 TeV using the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, D91(3), 032004. American Physical Society 10.1103/PhysRevD.91.032004

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The transverse polarization of Λ and Λ ¯ hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses 760 μ 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 x F from 5×10 −5 to 0.01 and transverse momentum p T from 0.8 to 15 GeV is −0.010±0.005(stat)±0.004(syst) for Λ and 0.002±0.006(stat)±0.004(syst) for Λ ¯ . It is also measured as a function of x F and p 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 F range covered by this mesurement.

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