Searching the inclusive l gamma EslashT+b-quark signature for radiative top quark decay and non-standard-model processes
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Aaltonen-2009-Searching the inclus.pdf
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Author(s)
Xie, Si
Knuteson, Bruce O.
Henderson, C.
Hahn, Kristian Allan
Gomez-Ceballos, Guillelmo
Choudalakis, Georgios
Paus, Christoph M. E.
Makhoul, Khaldoun
Goncharov, Maxim
Bauer, Gerry P
Alternative Title
Searching the inclusive ℓγE̸T+b-quark signature for radiative top quark decay and non-standard-model processes
Date Issued
July 2009
Journal
Physical Review D
Publisher
American Physical Society
Citation
CDF Collaboration et al. “Searching the inclusive l gamma EslashT+b-quark signature for radiative top quark decay and non-standard-model processes.” Physical Review D 80.1 (2009): 011102. © 2009 The American Physical Society
Version
Final published version
Abstract
We compare the inclusive production of events containing a lepton (ℓ), a photon (γ), significant transverse momentum imbalance (E̸[subscript T]), and a jet identified as containing a b-quark, to SM predictions. The search uses data produced in proton-antiproton collisions at √s=1.96 TeV corresponding to 1.9 fb[superscript -1] of integrated luminosity taken with the CDF detector. We find 28 ℓγb(E̸[subscript T]) events versus an expectation of 31.0[subscript -3.5][superscript +4.1] events. If we further require events to contain at least three jets and large total transverse energy, the largest SM source is radiative top-quark pair production, tt̅ +γ. In the data we observe 16 tt̅ γ candidate events versus an expectation from SM sources of 11.2-2.1+2.3. Assuming the difference between the observed number and the predicted non-top-quark total of 6.8[subscript -2.0][superscript +2.2] is due to SM top-quark production, we estimate the tt̅ γ cross section to be 0.15±0.08 pb.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevD.80.011102
