Search for single top production using multivariate analyses at CDF

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This article reports on recent searches for single-top-quark production by the CDF collaboration at the Tevatron using a data set that corresponds to an integrated luminosity of 955 pb{sup -1}. Three different analyses techniques are employed, one using likelihood discriminants, one neural networks and one matrix elements. The sensitivity to single-top production at the rate predicted by the standard model ranges from 2.1 to 2.6 {sigma}. While the first two analyses observe a deficit of single-top like events compared to the expectation, the matrix element method observes an excess corresponding to a background fluctuation of 2.3 {sigma}. The null results ... continued below

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4 pages

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Hirschbuhl, Dominic October 1, 2007.

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Description

This article reports on recent searches for single-top-quark production by the CDF collaboration at the Tevatron using a data set that corresponds to an integrated luminosity of 955 pb{sup -1}. Three different analyses techniques are employed, one using likelihood discriminants, one neural networks and one matrix elements. The sensitivity to single-top production at the rate predicted by the standard model ranges from 2.1 to 2.6 {sigma}. While the first two analyses observe a deficit of single-top like events compared to the expectation, the matrix element method observes an excess corresponding to a background fluctuation of 2.3 {sigma}. The null results of the likelihood and neural network analyses translate in upper limits on the cross section of 2.6 pb for the t-channel production mode and 3.7 pb for the s-channel mode at the 95% C.L. The matrix element result corresponds to a measurement of 2.7{sub -1.3}{sup +1.5} pb for the combined t- and s-channel single-top cross section. In addition, CDF has searched for non-standard model production of single-top-quarks via the s-channel exchange of a heavy W{prime} boson. No signal of this process is found resulting in lower mass limits of 760 GeV/c{sup 2} in case the mass of the right-handed neutrino is smaller than the mass of the right-handed W{prime} or 790 GeV/c{sup 2} in the opposite case.

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4 pages

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  • To appear in the proceedings of 15th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY07), Karlsruhe, Germany, 26 Jul - 1 Aug 2007

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  • Report No.: FERMILAB-CONF-07-557-E
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 920439
  • Archival Resource Key: ark:/67531/metadc898176

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 1, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 8, 2017, 2:36 p.m.

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Hirschbuhl, Dominic. Search for single top production using multivariate analyses at CDF, article, October 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc898176/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.