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Measurements of the Angular Distributions of Muons from Υ Decays in pp̅ Collisions at √s=1.96  TeV

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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Abstract
The angular distributions of muons from Υ(1S,2S,3S)→μ[superscript +]μ[superscript -] decays are measured using data from pp̅ collisions at √s=1.96  TeV corresponding to an integrated luminosity of 6.7  fb[superscript -1] and collected with the CDF II detector at the Fermilab Tevatron. This analysis is the first to report the full angular distributions as functions of transverse momentum [subscript pT] for Υ mesons in both the Collins-Soper and s-channel helicity frames. This is also the first measurement of the spin alignment of Υ(3S) mesons. Within the kinematic range of Υ rapidity |y|<0.6 and [subscript pT] up to 40  GeV/c, the angular distributions are found to be nearly isotropic.
Date issued
2012-04
URI
http://hdl.handle.net/1721.1/71624
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
T. Aaltonen et al. (CDF Collaboration). "Measurements of the Angular Distributions of Muons from Υ Decays in pp̅ Collisions at √s=1.96  TeV" Physical Review Letters 108, 151802 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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