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Measurement of the transverse polarization of Lambda and (Lambda)over-bar hyperons produced in proton-proton collisions at root s=7 TeV using the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 2859
2015 (English)In: Physical Review D, ISSN 1550-7998, E-ISSN 1550-2368, Vol. 91, no 3, 032004Article in journal (Refereed) Published
Abstract [en]

The transverse polarization of Lambda and (Lambda) over bar 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 x(F) from 5 x 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 Lambda and 0.002 +/- 0.006(stat) +/- 0.004(syst) for (Lambda) over bar. 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 measurement.

Place, publisher, year, edition, pages
2015. Vol. 91, no 3, 032004
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-247569DOI: 10.1103/PhysRevD.91.032004ISI: 000349487000001OAI: oai:DiVA.org:uu-247569DiVA: diva2:796915
Note

ATLAS Collaboration, for complete list of authors see dx.doi.org/10.1103/PhysRevD.91.032004

Available from: 2015-03-20 Created: 2015-03-20 Last updated: 2017-12-04Bibliographically approved

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Bergeås Kuutmann, ElinBrenner, RichardBuszello, Claus P.Ekelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, DanielRangel-Smith, Camila

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Bergeås Kuutmann, ElinBrenner, RichardBuszello, Claus P.Ekelöf, TordEllert, MattiasFerrari, ArnaudIsaksson, CharlieMadsen, AlexanderÖhman, HenrikPelikan, DanielRangel-Smith, Camila
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High Energy Physics
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