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Title: Search of anomalous $Wtb$ couplins in single top quark prodution at D0

Abstract

The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model, including possible anomalous couplings. D0 has made measurements of single top quark production using 5.4 fb{sup -1} of integrated luminosity. We examine the data to study the Lorentz structure of the Wtb coupling. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. In 2009, the electroweak single top quark production was observed by the D0 and CDF collaborations. Electroweak production of top quarks at the Tevatron proceeds mainly via the decay of a time-like virtual W boson accompanied by a bottom quark in the s-channel (tb = t{bar b} + {bar t}b), or via the exchange of a space-like virtual W boson between a light quark and a bottom quark in the t-channel (tqb = tq{bar b} + {bar t}qb, where q refers to the light quark). For a top quark mass of 172.5 GeV, The Standard Model (SM) prediction of single top production rate at next-to-leading order with soft-gluon contributions at next-to-next-to-leading order are 1.04 {+-} 0.04 pb (s-channel) and 2.26 {+-} 0.12 pb (t-channel).more » The large mass of the top quark implies that it has large couplings to the electroweak symmetry breaking sector of the SM and may have non-standard interactions with the weak gauge bosons. Single top quark production provides a unique probe to study the interactions of the top quark with the W boson.« less

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1039345
Report Number(s):
FERMILAB-CONF-11-648-E
TRN: US1202145
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Journal Name:
Submitted to Pramana
Additional Journal Information:
Conference: Presented at 25th International Symposium on Lepton Photon Interactions at High Energy (LP11), Mumbai, India, 22-27 Aug 2011
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BOSONS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; INTERMEDIATE BOSONS; LEPTONS; LUMINOSITY; PHOTONS; PHYSICS; PROBES; PRODUCTION; QUARKS; S CHANNEL; STANDARD MODEL; SYMMETRY BREAKING; T CHANNEL; T QUARKS; VECTORS; Accelerators

Citation Formats

Joshi, Jyoti, Beri, Suman, and /Panjab U. Search of anomalous $Wtb$ couplins in single top quark prodution at D0. United States: N. p., 2011. Web.
Joshi, Jyoti, Beri, Suman, & /Panjab U. Search of anomalous $Wtb$ couplins in single top quark prodution at D0. United States.
Joshi, Jyoti, Beri, Suman, and /Panjab U. 2011. "Search of anomalous $Wtb$ couplins in single top quark prodution at D0". United States. https://www.osti.gov/servlets/purl/1039345.
@article{osti_1039345,
title = {Search of anomalous $Wtb$ couplins in single top quark prodution at D0},
author = {Joshi, Jyoti and Beri, Suman and /Panjab U.},
abstractNote = {The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model, including possible anomalous couplings. D0 has made measurements of single top quark production using 5.4 fb{sup -1} of integrated luminosity. We examine the data to study the Lorentz structure of the Wtb coupling. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. In 2009, the electroweak single top quark production was observed by the D0 and CDF collaborations. Electroweak production of top quarks at the Tevatron proceeds mainly via the decay of a time-like virtual W boson accompanied by a bottom quark in the s-channel (tb = t{bar b} + {bar t}b), or via the exchange of a space-like virtual W boson between a light quark and a bottom quark in the t-channel (tqb = tq{bar b} + {bar t}qb, where q refers to the light quark). For a top quark mass of 172.5 GeV, The Standard Model (SM) prediction of single top production rate at next-to-leading order with soft-gluon contributions at next-to-next-to-leading order are 1.04 {+-} 0.04 pb (s-channel) and 2.26 {+-} 0.12 pb (t-channel). The large mass of the top quark implies that it has large couplings to the electroweak symmetry breaking sector of the SM and may have non-standard interactions with the weak gauge bosons. Single top quark production provides a unique probe to study the interactions of the top quark with the W boson.},
doi = {},
url = {https://www.osti.gov/biblio/1039345}, journal = {Submitted to Pramana},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {12}
}

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