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.
MetadataShow full item record
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.
DepartmentMassachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Physical Review Letters
American Physical Society
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
Final published version