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- W1518414919 abstract "The angular distributions of muons from Υ(1S,2S,3S)→μ+μ− decays are measured using data from pp¯ collisions at s=1.96 TeV corresponding to an integrated luminosity of 6.7 fb−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 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 pT up to 40 GeV/c, the angular distributions are found to be nearly isotropic.Received 6 December 2011DOI:https://doi.org/10.1103/PhysRevLett.108.151802© 2012 American Physical Society" @default.
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