The angular distributions of muons from Υ(1S,2S,3S)→μ+μ-
decays are measured using data from pp̅ 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 spi+n alignment of
Υ(3S) mesons. Within the kinematic range of Υ rapi+dity |y|<0.6
and pT up to 40 GeV/c, the angular distributions are found to be
nearly isotropi+c.
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Updated: Thursday, 2012 April 19 08:44:57 CDT automatically from input from Stephanie A Schuler