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Evidence for tt̅ γ production and measurement of σtt̅ γ/σtt̅

AuthorsÁlvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; Vizán, J. ; Aaltonen, T.
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review D 84(3): 031104(R) (2011)
AbstractUsing 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.
Description9 páginas, 3 figuras, 2 tablas.-- PACS numbers: 13.85.Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly.-- CDF Collaboration: et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.84.031104
Appears in Collections:(IFCA) Artículos
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