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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| Format: | Article |
| Language: | English |
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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 |
| _version_ | 1818900426180788224 |
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| author | Jones Matthew |
| author_facet | Jones Matthew |
| author_sort | Jones Matthew |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-19T20:03:40Z |
| format | Article |
| id | doaj.art-0414b5d87e8b47018acb4a41f6ce1b96 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-19T20:03:40Z |
| publishDate | 2012-06-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-0414b5d87e8b47018acb4a41f6ce1b962022-12-21T20:07:34ZengEDP 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 |
| spellingShingle | Jones Matthew New Measurements of Upsilon Spin Alignment at the Tevatron EPJ Web of Conferences |
| title | 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_short | New Measurements of Upsilon Spin Alignment at the Tevatron |
| title_sort | new measurements of upsilon spin alignment at the tevatron |
| url | http://dx.doi.org/10.1051/epjconf/20122804009 |
| work_keys_str_mv | AT jonesmatthew newmeasurementsofupsilonspinalignmentatthetevatron |