Download or read book Evidence for t bar t gamma Production and Measurement of sigma t bar t gamma written by and published by . This book was released on 2011 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using data corresponding to 6.0 fb−1 of p{bar p} 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, t{bar t}[gamma]. The events are selected by looking for a lepton (l), a photon ([gamma]), significant transverse momentum imbalance (E{sub T}), large total transverse energy, and three or more jets, with at least one identified as containing a b quark (b). The t{bar t}[gamma] sample requires the photon to have 10 GeV or more of transverse energy, and to be in the central region. Using an event selection optimized for the t{bar t}[gamma] candidate sample we measure the production cross section of t{bar t} ([sigma]{sub t{bar t}}), and the ratio of cross sections of the two samples. Control samples in the dilepton+photon and lepton+photon+E{sub T}, channels are constructed to aid in decay product identification and background measurements. We observe 30 t{bar t}[gamma] candidate events compared to the standard model expectation of 26.9 ± 3.4 events. We measure the t{bar t}[gamma] cross section ([sigma]{sub t{bar t}}) to be 0.18 ± 0.08 pb, and the ratio of [sigma]{sub t{bar t}[gamma]} to [sigma]{sub t{bar t}} to be 0.024 ± 0.009. Assuming no t{bar t}[gamma] production, we observe a probability of 0.0015 of the background events alone producing 30 events or more, corresponding to 3.0 standard deviations.
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Download or read book Measurement of sigma p bar P T bar T at right Arrow written by and published by . This book was released on 1996 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Particle Physics written by Robert Purdy and published by Mercury Learning and Information. This book was released on 2017-12-21 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed as a brief introduction to the fundamental particles that make up the matter in our universe. Numerous examples, figures, and simple explanations enable general readers and physics students to understand complex concepts related to the universe. Selected topics include atoms, quarks, accelerators, detectors, colliders, string theory, and more.
Download or read book High Energy Physics Index written by and published by . This book was released on 1990 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1994 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Avian Viral Immunosuppressive Disease written by Yulong Gao and published by Frontiers Media SA. This book was released on 2022-11-11 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt:
