Search for single top production using multivariate analyses at CDF
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 920439
- Report Number(s):
- FERMILAB-CONF-07-557-E; arXiv eprint number arXiv:0710.3275; TRN: US0805583
- Resource Relation:
- Conference: 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
- Country of Publication:
- United States
- Language:
- English
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