Search for Production of Single Top Quarks Via tcg and tug Flavor-Changing-Neutral-Current Couplings

Journal Article · Fri Nov 09 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.191802· OSTI ID:21024410

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 ^[1]; Abbott, B; Gutierrez, P; Hall, I; Jain, S; Kopal, M; Pompos, A; Severini, H; Skubic, P; Strauss, M ^[2]; Abolins, M; Benitez, J A ^[3]

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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)

We search for the production of single top quarks via flavor-changing-neutral-current couplings of a gluon to the top quark and a charm (c) or up (u) quark. We analyze 230 pb{sup -1} of lepton+jets data from pp collisions at a center of mass energy of 1.96 TeV collected by the D0 detector at the Fermilab Tevatron Collider. We observe no significant deviation from standard model predictions, and hence set upper limits on the anomalous coupling parameters {kappa}{sub g}{sup c}/{lambda} and {kappa}{sub g}{sup u}/{lambda}, where {kappa}{sub g} define the strength of tcg and tug couplings, and {lambda} defines the scale of new physics. The limits at 95% C.L. are {kappa}{sub g}{sup c}/{lambda}<0.15 TeV{sup -1} and {kappa}{sub g}{sup u}/{lambda}<0.037 TeV{sup -1}.

• OSTI ID: 21024410
• Journal Information: Physical Review Letters, Vol. 99, Issue 19; Other Information: DOI: 10.1103/PhysRevLett.99.191802; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). D0 Collaboration; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
C QUARKS
FERMILAB TEVATRON
FLAVOR MODEL
GLUONS
LEPTONS
NEUTRAL CURRENTS
PROTON-PROTON INTERACTIONS
STANDARD MODEL
T QUARKS
TEV RANGE 01-10
U QUARKS