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Title: Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar

Abstract

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp collider. Using a 0.9 fb{sup -1} dataset, we apply a multivariate analysis to separate signal from background and measure {sigma}(pp{yields}tb+X,tqb+X)=4.9{+-}1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68< vertical bar V{sub tb} vertical bar {<=}1 at 95% C.L. within the standard model.

Authors:
; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ;  [2]; ;  [3]
  1. Joint Institute for Nuclear Research, Dubna (Russian Federation)
  2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
  3. Michigan State University, East Lansing, Michigan 48824 (United States) (and others)
Publication Date:
OSTI Identifier:
20951329
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevLett.98.181802; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; FERMILAB TEVATRON; KOBAYASHI-MASKAWA MATRIX; MULTIVARIATE ANALYSIS; PROBABILITY; SIGNALS; STANDARD MODEL; T QUARKS

Citation Formats

Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Eijk, B. van, Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., and Benitez, J. A. Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.181802.
Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Eijk, B. van, Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., & Benitez, J. A. Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar. United States. doi:10.1103/PHYSREVLETT.98.181802.
Abazov, V. M., Alexeev, G. D., Kalinin, A. M., Kharzheev, Y. M., Malyshev, V. L., Tokmenin, V. V., Eijk, B. van, Vertogradov, L. S., Yatsunenko, Y. A., Abbott, B., Gutierrez, P., Hall, I., Jain, S., Kopal, M., Pompos, A., Severini, H., Skubic, P., Strauss, M., Abolins, M., and Benitez, J. A. Fri . "Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar". United States. doi:10.1103/PHYSREVLETT.98.181802.
@article{osti_20951329,
title = {Evidence for Production of Single Top Quarks and First Direct Measurement of vertical bar V{sub tb} vertical bar},
author = {Abazov, V. M. and Alexeev, G. D. and Kalinin, A. M. and Kharzheev, Y. M. and Malyshev, V. L. and Tokmenin, V. V. and Eijk, B. van and Vertogradov, L. S. and Yatsunenko, Y. A. and Abbott, B. and Gutierrez, P. and Hall, I. and Jain, S. and Kopal, M. and Pompos, A. and Severini, H. and Skubic, P. and Strauss, M. and Abolins, M. and Benitez, J. A.},
abstractNote = {The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp collider. Using a 0.9 fb{sup -1} dataset, we apply a multivariate analysis to separate signal from background and measure {sigma}(pp{yields}tb+X,tqb+X)=4.9{+-}1.4 pb. The probability to measure a cross section at this value or higher in the absence of a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68< vertical bar V{sub tb} vertical bar {<=}1 at 95% C.L. within the standard model.},
doi = {10.1103/PHYSREVLETT.98.181802},
journal = {Physical Review Letters},
number = 18,
volume = 98,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2007},
month = {Fri May 04 00:00:00 EDT 2007}
}