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Evidence for tt[over ¯]γ production and measurement of σ_{tt[over ¯]γ}/σ_{tt[over ¯]}
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(2011) Evidence for tt[over ¯]γ production and measurement of σ_{tt[over ¯]γ}/σ_{tt[over ¯]}. Physical Review D, Vol. 84 (No.3). doi:10.1103/PhysRevD.84.031104 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.84.031104
Abstract
Using data corresponding to 6.0 fb-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.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review D | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1550-7998 | ||||
Official Date: | 2011 | ||||
Dates: |
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Volume: | Vol. 84 | ||||
Number: | No.3 | ||||
DOI: | 10.1103/PhysRevD.84.031104 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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