New Measurements of Upsilon Spin Alignment at the Tevatron

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We describe a new analysis of {Upsilon}(nS) {yields} {mu}{sup +}{mu}{sup -} decays collected in p{bar p} collisions with the CDF II detector at the Fermilab Tevatron. This analysis measures the angular distributions of the final state muons in the {Upsilon} rest frame, providing new information about {Upsilon} production polarization. We find the angular distributions to be nearly isotropic up to {Upsilon} p{sub T} 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 ... continued below

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4 pages

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Jones, Matthew January 1, 2012.

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Description

We describe a new analysis of {Upsilon}(nS) {yields} {mu}{sup +}{mu}{sup -} decays collected in p{bar p} collisions with the CDF II detector at the Fermilab Tevatron. This analysis measures the angular distributions of the final state muons in the {Upsilon} rest frame, providing new information about {Upsilon} production polarization. We find the angular distributions to be nearly isotropic up to {Upsilon} p{sub T} 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.

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4 pages

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  • Prepared for Hadron Collider Physics Symposium 2011 (HCP 2011), Paris, France, 14-18 Nov 2011

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  • Report No.: FERMILAB-CONF-12-019-E
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 1034130
  • Archival Resource Key: ark:/67531/metadc832408

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 2012

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Aug. 29, 2016, 2:27 p.m.

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Jones, Matthew. New Measurements of Upsilon Spin Alignment at the Tevatron, article, January 1, 2012; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc832408/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.