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

研究成果: Article査読

30 被引用数 (Scopus)

抄録

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 μb-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 5×10-5 to 0.01 and transverse momentum pT 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 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.

本文言語English
論文番号032004
ジャーナルPhysical Review D - Particles, Fields, Gravitation and Cosmology
91
3
DOI
出版ステータスPublished - 2015 2月 9

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学
  • 物理学および天文学(その他)

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