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Title: Search for single-top production at CDF

Abstract

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{sup +1.5}{sub -1.3} 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 neutrinomore » is smaller than the mass of the right-handed W{prime} or 790GeV/c{sup 2} in the opposite case.« less

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
908367
Report Number(s):
FERMILAB-CONF-07-152-E
arXiv eprint number arXiv:0705.2954; TRN: US0703675
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: To appear in the proceedings of 42nd Rencontres de Moriond on QCD and Hadronic Interactions, La Thuile, Italy, 17-24 Mar 2007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FLUCTUATIONS; LUMINOSITY; MATRIX ELEMENTS; NEURAL NETWORKS; NEUTRINOS; PRODUCTION; QUANTUM CHROMODYNAMICS; S CHANNEL; SENSITIVITY; T CHANNEL; Experiment-HEP

Citation Formats

Wagner, Wolfgang, and /Karlsruhe U., EKP. Search for single-top production at CDF. United States: N. p., 2007. Web.
Wagner, Wolfgang, & /Karlsruhe U., EKP. Search for single-top production at CDF. United States.
Wagner, Wolfgang, and /Karlsruhe U., EKP. Tue . "Search for single-top production at CDF". United States. doi:. https://www.osti.gov/servlets/purl/908367.
@article{osti_908367,
title = {Search for single-top production at CDF},
author = {Wagner, Wolfgang and /Karlsruhe U., EKP},
abstractNote = {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{sup +1.5}{sub -1.3} 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 790GeV/c{sup 2} in the opposite case.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}

Conference:
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