New Measurements of Upsilon Spin Alignment at the Tevatron
We describe a new analysis of γ(nS) → μ+μ− decays collected in pp¯ $par p$ 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...
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EDP Sciences
2012-06-01
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| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20122804009 |
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doaj-0414b5d87e8b47018acb4a41f6ce1b962021-08-02T02:47:37ZengEDP SciencesEPJ Web of Conferences2100-014X2012-06-01280400910.1051/epjconf/20122804009New Measurements of Upsilon Spin Alignment at the TevatronJones MatthewWe describe a new analysis of γ(nS) → μ+μ− decays collected in pp¯ $par p$ 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. http://dx.doi.org/10.1051/epjconf/20122804009 |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Jones Matthew |
| spellingShingle |
Jones Matthew New Measurements of Upsilon Spin Alignment at the Tevatron EPJ Web of Conferences |
| author_facet |
Jones Matthew |
| author_sort |
Jones Matthew |
| title |
New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_short |
New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_full |
New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_fullStr |
New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_full_unstemmed |
New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_sort |
new measurements of upsilon spin alignment at the tevatron |
| publisher |
EDP Sciences |
| series |
EPJ Web of Conferences |
| issn |
2100-014X |
| publishDate |
2012-06-01 |
| description |
We describe a new analysis of γ(nS) → μ+μ− decays collected in pp¯ $par p$ 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. |
| url |
http://dx.doi.org/10.1051/epjconf/20122804009 |
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