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| Título: | Evidence for tt̅ γ production and measurement of σtt̅ γ/σtt̅ |
Autor: | Álvarez González, B.; Casal, Bruno CSIC; Cuevas, Javier CSIC ORCID; Gómez, Gervasio CSIC ORCID ; Palencia, Enrique CSIC ORCID; Rodrigo, Teresa CSIC ORCID ; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar Cortabitarte, R. CSIC ORCID; Vizán, J. CSIC ORCID; Aaltonen, T. | Fecha de publicación: | 2011 | Editor: | American Physical Society | Citación: | Physical Review D 84(3): 031104(R) (2011) | Resumen: | 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. | Descripción: | 9 páginas, 3 figuras, 2 tablas.-- PACS numbers: 13.85.Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly.-- CDF Collaboration: et al. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevD.84.031104 | URI: | http://hdl.handle.net/10261/46006 | DOI: | 10.1103/PhysRevD.84.031104 | ISSN: | 1550-7998 | E-ISSN: | 1550-2368 |
| Aparece en las colecciones: | (IFCA) Artículos |
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| e031104.pdf | 301,44 kB | Adobe PDF |  Visualizar/Abrir |
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