Measurements of the Angular Distributions of Muons from Υ Decays in pp̅ Collisions at √s=1.96 TeV
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Aaltonen-2012-Measurements of the Angular Distributions of.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Date Issued
April 2012
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.108.151802
