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Title: Evidence for production of single top quarks

Abstract

We present first evidence for the production of single top quarks in the D0 detector at the Fermilab Tevatron p{bar p} collider. The standard model predicts that the electroweak interaction can produce a top quark together with an antibottom quark or light quark, without the antiparticle top quark partner that is always produced from strong coupling processes. Top quarks were first observed in pair production in 1995, and since then, single top quark production has been searched for in ever larger datasets. In this analysis, we select events from a 0.9 fb{sup -1} dataset that have an electron or muon and missing transverse energy from the decay of a W boson from the top quark decay, and two, three, or four jets, with one or two of the jets identified as originating from a b hadron decay. The selected events are mostly backgrounds such as W+jets and t{bar t} events, which we separate from the expected signals using three multivariate analysis techniques: boosted decision trees, Bayesian neural networks, and matrix element calculations. A binned likelihood fit of the signal cross section plus background to the data from the combination of the results from the three analysis methods gives a crossmore » section for single top quark production of {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.7 {+-} 1.3 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.014%, corresponding to a 3.6 standard deviation significance. The measured cross section value is compatible at the 10% level with the standard model prediction for electroweak top quark production. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa quark mixing matrix element that describes the Wtb coupling and find |V{sub tb}f{sub 1}{sup L}| = 1.31{sub -0.21}{sup +0.25}, where f{sub 1}{sup L} is a generic vector coupling. This model-independent measurement translates into 0.68 < |V{sub tb}| {le} 1 at the 95% C.L. in the standard model.« less

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
925919
Report Number(s):
FERMILAB-PUB-08-056-E
arXiv eprint number arXiv:0803.0739; TRN: US0802475
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANTIPARTICLES; CROSS SECTIONS; DECAY; ELECTRONS; FERMILAB TEVATRON; FORECASTING; HADRONS; INTERMEDIATE BOSONS; MATRIX ELEMENTS; MULTIVARIATE ANALYSIS; MUONS; NEURAL NETWORKS; PAIR PRODUCTION; QUARKS; STANDARD MODEL; T QUARKS; TRANSVERSE ENERGY; VECTORS; Experiment-HEP

Citation Formats

Abazov, V M, /Dubna, JINR, Abbott, B, /Oklahoma U., Abolins, M, /Michigan State U., Acharya, B S, /Tata Inst., Adams, M, /Illinois U., Chicago, Adams, T, /Florida State U., Aguilo, E, /Simon Fraser U., Ahn, S H, /Korea U., KODEL, Ahsan, M, /Kansas State U., Alexeev, G D, /Dubna, JINR, Alkhazov, G, and /St. Petersburg, INP /Michigan U. Evidence for production of single top quarks. United States: N. p., 2008. Web. doi:10.1103/PhysRevD.78.012005.
Abazov, V M, /Dubna, JINR, Abbott, B, /Oklahoma U., Abolins, M, /Michigan State U., Acharya, B S, /Tata Inst., Adams, M, /Illinois U., Chicago, Adams, T, /Florida State U., Aguilo, E, /Simon Fraser U., Ahn, S H, /Korea U., KODEL, Ahsan, M, /Kansas State U., Alexeev, G D, /Dubna, JINR, Alkhazov, G, & /St. Petersburg, INP /Michigan U. Evidence for production of single top quarks. United States. https://doi.org/10.1103/PhysRevD.78.012005
Abazov, V M, /Dubna, JINR, Abbott, B, /Oklahoma U., Abolins, M, /Michigan State U., Acharya, B S, /Tata Inst., Adams, M, /Illinois U., Chicago, Adams, T, /Florida State U., Aguilo, E, /Simon Fraser U., Ahn, S H, /Korea U., KODEL, Ahsan, M, /Kansas State U., Alexeev, G D, /Dubna, JINR, Alkhazov, G, and /St. Petersburg, INP /Michigan U. Sat . "Evidence for production of single top quarks". United States. https://doi.org/10.1103/PhysRevD.78.012005. https://www.osti.gov/servlets/purl/925919.
@article{osti_925919,
title = {Evidence for production of single top quarks},
author = {Abazov, V M and /Dubna, JINR and Abbott, B and /Oklahoma U. and Abolins, M and /Michigan State U. and Acharya, B S and /Tata Inst. and Adams, M and /Illinois U., Chicago and Adams, T and /Florida State U. and Aguilo, E and /Simon Fraser U. and Ahn, S H and /Korea U., KODEL and Ahsan, M and /Kansas State U. and Alexeev, G D and /Dubna, JINR and Alkhazov, G and /St. Petersburg, INP /Michigan U.},
abstractNote = {We present first evidence for the production of single top quarks in the D0 detector at the Fermilab Tevatron p{bar p} collider. The standard model predicts that the electroweak interaction can produce a top quark together with an antibottom quark or light quark, without the antiparticle top quark partner that is always produced from strong coupling processes. Top quarks were first observed in pair production in 1995, and since then, single top quark production has been searched for in ever larger datasets. In this analysis, we select events from a 0.9 fb{sup -1} dataset that have an electron or muon and missing transverse energy from the decay of a W boson from the top quark decay, and two, three, or four jets, with one or two of the jets identified as originating from a b hadron decay. The selected events are mostly backgrounds such as W+jets and t{bar t} events, which we separate from the expected signals using three multivariate analysis techniques: boosted decision trees, Bayesian neural networks, and matrix element calculations. A binned likelihood fit of the signal cross section plus background to the data from the combination of the results from the three analysis methods gives a cross section for single top quark production of {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.7 {+-} 1.3 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.014%, corresponding to a 3.6 standard deviation significance. The measured cross section value is compatible at the 10% level with the standard model prediction for electroweak top quark production. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa quark mixing matrix element that describes the Wtb coupling and find |V{sub tb}f{sub 1}{sup L}| = 1.31{sub -0.21}{sup +0.25}, where f{sub 1}{sup L} is a generic vector coupling. This model-independent measurement translates into 0.68 < |V{sub tb}| {le} 1 at the 95% C.L. in the standard model.},
doi = {10.1103/PhysRevD.78.012005},
url = {https://www.osti.gov/biblio/925919}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {3}
}