| Issue |
EPJ Web of Conferences
Volume 28, 2012
Hadron Collider Physics Symposium, 2011
|
|
|---|---|---|
| Article Number | 04009 | |
| Number of page(s) | 4 | |
| Section | Heavy Flavours production, CP violation and rare decays | |
| DOI | https://doi.org/10.1051/epjconf/20122804009 | |
| Published online | 06 June 2012 | |
https://doi.org/10.1051/epjconf/20122804009
New Measurements of Upsilon Spin Alignment at the Tevatron
Department of Physics, Purdue University, USA
a e-mail: mjones@physics.purdue.edu
We describe a new analysis of γ(nS) → μ+μ− decays collected in 
collisions with the CDF II detector at the Fermilab Tevatron. This analysis measures the angular distributions of the final state muons in the γ rest frame, providing new information about γ production polarization. We find the angular distributions to be nearly isotropic up to γ pT of 40 GeV/c, consistent with previous measurements by CDF, but inconsistent with results obtained by the D0 experiment. The results are compared with recent NLO calculations based on color-singlet matrix elements and non-relativistic QCD with color-octet matrix elements.
© Owned by the authors, published by EDP Sciences, 2012
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