Measurement of the transverse polarization of Λ and [bar over Λ] hyperons produced in proton-proton collisions at √s = 7 TeV using the ATLAS detector
Name
PhysRevD.91.032004.pdf
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722.11 KB
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Checksum (MD5)
4ed7674d6bac80e409b814138a0f7db3
Author(s)
Taylor, Frank E.
Date Issued
February 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, et al. “Measurement of the Transverse Polarization of Λ and [bar over Λ] Hyperons Produced in Proton-Proton Collisions at √s = 7 TeV Using the ATLAS Detector.” Phys. Rev. D 91, no. 3 (February 2015). © 2015 CERN, for the ATLAS Collaboration
Version
Final published version
Abstract
The transverse polarization of Λ and [bar over Λ] hyperons produced in proton-proton collisions at a center-of-mass energy of 7 TeV is measured. The analysis uses 760 μb[superscript −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[subscript F] from 5 × 10[superscript −5] to 0.01 and transverse momentum p[subscript 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 [bar over Λ]. It is also measured as a function of x[subscript F] and p[subscript 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[subscript F] range covered by this measurement.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution 3.0 Unported Licence
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.91.032004
