Evidence for tt̅ γ production and measurement of σtt̅ γ/σtt
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Aaltonen-2011-Evidence for.pdf
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Author(s)
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Paus, Christoph M. E.
Bauer, Gerry P
Makhoul, Khaldoun
Date Issued
July 2011
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aaltonen, T. et al. "Evidence for tt̅ γ production and measurement of σtt̅ γ/σtt." Physical Review D 84, 031104(R) (2011) [9 pages].© 2011 American Physical Society.
Version
Final published version
Abstract
Using data corresponding to 6.0 fb[superscript -1] of pp̅ collisions at √s=1.96 TeV collected by the CDF II detector, we present a cross section measurement of top-quark pair production with an additional radiated photon in the central region with 10 GeV or more of transverse energy tt̅ γ. The events are selected by looking for a lepton (ℓ or μ), a photon (γ), significant transverse momentum imbalance (E̸T), large total transverse energy, and three or more jets, with at least one identified as containing a b quark (b). Using an event selection optimized for the tt̅ γ candidate sample, we also measure the cross section of tt̅ (σtt̅ ). We measure the tt̅ γ cross section (σtt̅ γ) to be 0.18±0.08 pb, and the ratio of σtt̅ γ to σtt̅ to be 0.024±0.009. We observe a probability of 0.0015 (3.0 standard deviations) of the background (non-tt̅ γ events alone producing 30 events or more.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.84.031104
