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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.