Evidence For S Channel Single Top Quark Production In P Bar P Collisions At Sqrt S
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Evidence For S Channel Single Top Quark Production In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Evidence For S Channel Single Top Quark Production In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Scientific And Technical Aerospace Reports
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language : en
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Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Observation Of Single Top Quark Production
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language : en
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Release Date : 2009
Observation Of Single Top Quark Production written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The author reports on the observation of electroweak production of single top quarks in p{bar p} collisions at (square root)s = 1.96 Tev using 2.3 fb−1 of data collected with the D0 detector at the fermilab Tevatron Collider. Using events containing an isolated electron or muon, missing transverse energy, two, three or four jets, with one or two of them identified as originating from the fragmentation of a b quark, the measured cross section for the process p{bar p} --> tb + X, tqb + X is 3.94 ± 0.88 pb (for a top quark mass of 170 GeV). the probability to measure a cross section at this value or higher in the absence of signal is 2.5 x 10−7, corresponding to a 5.0 standard deviation significance. Using the same dataset, the measured cross sections for the t- and the s-channel processes when determined simultaneously with no assumption on their relative production rate are 3.14{sub -0.80}{sup +0.94} pb and 1.05 ± 0.81 pb respectively, consistent with standard model expectations. The measured t-channel cross section has a significance of 4.8 standard deviations, representing the first evidence for the production of an individual single top process to be detected.
Science Citation Index
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language : en
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Release Date : 1995
Science Citation Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Science categories.
Vols. for 1964- have guides and journal lists.
Search For Single Top Quark Production In Pbar P Collisions At Sqrt S
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Author :
language : en
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Release Date : 2010
Search For Single Top Quark Production In Pbar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
We report a search for single top quark production with the CDF II detector using 2.1 fb−1 of integrated luminosity of p{bar p} collisions at √s = 1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W → [tau][nu] decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations ([sigma]), with a median expected sensitivity of 1.4 [sigma]. Assuming a top quark mass of 175 GeV/c2 and ascribing the excess to single top quark production, the cross section is measured to be 4.9{sub -2.2}{sup +2.5} (stat+syst) pb, consistent with measurements performed in independent datasets and with the standard model prediction.
Model Independent Measurement Of Boldsymbol T Channel Single Top Quark Production In Boldsymbol P Bar P Collisions At Boldsymbol Sqrt S
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language : en
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Release Date : 2011
Model Independent Measurement Of Boldsymbol T Channel Single Top Quark Production In Boldsymbol P Bar P Collisions At Boldsymbol Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
We present a model-independent measurement of t-channel electroweak production of single top quarks in p{bar p} collisions at √s = 1.96 TeV. Using 5.4 fb−1 of integrated luminosity collected by the D0 detector at the Fermilab Tevatron Collider, and selecting events containing an isolated electron or muon, missing transverse energy and one or two jets originating from the fragmentation of b quarks, we measure a cross section [sigma](p{bar p} → tqb + X) = 2.90 ± 0.59 (stat + syst) pb for a top quark mass of 172.5 GeV. The probability of the background to fluctuate and produce a signal as large as the one observed is 1.6 x 10−8, corresponding to a significance of 5.5 standard deviations.
Search For Single Top Quark Production In P Anti P Collisions At S 1 2
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language : en
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Release Date : 2005
Search For Single Top Quark Production In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We present a search for electroweak production of single top quarks in the s-channel and t-channel using neural networks for signal-background separation. We have analyzed 230 pb−1 of data collected with the D0 detector at the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV and find no evidence for a single top quark signal. The resulting 95% confidence level upper limits on the single top quark production cross sections are 6.4 pb in the s-channel and 5.0 pb in the t-channel.
Evidence For Electroweak Top Quark Production In Proton Antiproton Collisions At S 1 2
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language : en
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Release Date : 2007
Evidence For Electroweak Top Quark Production In Proton Antiproton Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
We present the first evidence for electroweak single top quark production using nearly 1 fb−1 of Tevatron Run II data at √s = 1.96 TeV. We select single-top-like data events in the lepton+jets decay channel and separate them from backgrounds using the matrix element analysis method. This technique uses leading order matrix elements to compute an event probability for both signal and background hypotheses. Using the expected signal acceptance, background, and observed data we measure the single top quark cross section: [sigma](p{bar p} → tb + tqb + X) = 4.6{sub -1.5}+1.8 pb. The probability for the background to have fluctuated up to give at least the cross section measured in this analysis is 0.21%, which corresponds to a Gaussian equivalent significance of 2.9[sigma].
Search For S Channel Single Top Quark Production In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2016
Search For S Channel Single Top Quark Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. Data collected at centre-of-mass energies of 7 and 8 TeV yield cross sections of 7.1 +/- 8.1 pb and 13.4 +/- 7.3 pb, respectively, and a best fit value of 2.0 +/- 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level.
Juryfreie Kunstausstellung Berlin 1955
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Author :
language : en
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Release Date : 1955
Juryfreie Kunstausstellung Berlin 1955 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1955 with Art, German categories.