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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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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Author :
language : en
Publisher:
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.
Measurement Of Boldsymbol Ttb Production In The Tau Jets Channel Using Boldsymbol P Bar P Collisions At Boldsymbol Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of Boldsymbol Ttb Production In The Tau Jets Channel Using 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 2010 with categories.
We present a measurement of the t{bar t} production cross section multiplied by the branching ratio to tau lepton decaying semi-hadronically ([tau]{sub h}) plus jets, [sigma](p{bar p} → t{bar t} + X) · BR(t{bar t} → [tau]{sub h} + jets), at a center of mass energy √s = 1.96 TeV using 1 fb−1 of integrated luminosity collected with the D0 detector. Assuming a top quark mass of 170 GeV, we measure [sigma]{sub t{bar t}} · BR{sub [tau]{sub h}+j} = 0.60{sub -0.22}{sup +0.23}(stat){sub -0.14}{sup +0.15}(syst)±0.04 (lumi) pb. In addition, we extract the t{bar t} production cross section using the t{bar t} → {tau}{sub h} + jets topology, with the result [sigma]{sub t{bar t}} = 6.9{sub -1.2}{sup +1.2}(stat){sub -0.7}{sup +0.8}(syst) ± 0.4 (lumi) pb. These findings are in good agreement with standard model predictions and measurements performed using other top quark decay channels.
Search For Single Top Quark Production In Pbar P Collisions At Sqrt S
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Author :
language : en
Publisher:
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.
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.
Measurement Of The T Channel Single Top Quark Production Cross Section In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The T Channel Single Top Quark Production Cross Section 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 2011 with categories.
Electroweak production of the top quark is measured in pp collisions at sqrt(s) = 7 TeV, using a dataset collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. With an event selection optimized for t-channel production, two complementary analyses are performed. The first one exploits the special angular properties of the signal, together with background estimates from data. The second approach uses a multivariate analysis technique to probe the compatibility with signal topology expected from electroweak top quark production. The combined measurement of the cross section is 83.6 +/- 29.8 (stat.+syst.) +/- 3.3 (lumi.) pb, consistent with the standard model expectation.
Cross Section Measurement Of T Channel Single Top Quark Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Cross Section Measurement Of T 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.
The cross section for the production of single top quarks in the $t$ channel is measured in proton-proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.3 fb$^{-1}$. The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 232 $\pm$ 13 (stat) $\pm$ 28 (syst) pb and a ratio of top quark and top antiquark production of $R_{t\textrm{-ch.}}= $ 1.81 $\pm$ 0.18 (stat) $\pm$ 0.15 (syst). From the total cross section the absolute value of the CKM matrix element $V_{\mathrm{tb}}$ is calculated to be 1.03 $\pm$ 0.07 (exp) $\pm$ 0.02 (theo). All results are in agreement with the standard model predictions.
Search For T Channel Single Top Quark Production In P Bar P Collisions At 1 96 Tev
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Author :
language : en
Publisher:
Release Date : 2006
Search For T Channel Single Top Quark Production In P Bar P Collisions At 1 96 Tev written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
I have performed a search for t-channel single top quark production in p$ar{p}$ single number sub collisions at 1.96 TeV on a 366 pb-1 dataset collected with the D0 detector from 2002-2005. The analysis is restricted to the leptonic decay of the W boson from the top quark to an electron or muon, tq$ar{b}$ → lvlb q$ar{b}$ (l = e,?). A powerful b-quark tagging algorithm derived from neural networks is used to identify b jets and significantly reduce background. I further use neural networks to discriminate signal from background, and apply a binned likelihood calculation to the neural network output distributions to derive the final limits. No direct observation of single top quark production has been made, and I report expected/measured 95% confidence level limits of 3.5/8.0 pb.
Modern Drawings And Watercolours
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Author :
language : en
Publisher:
Release Date : 1967
Modern Drawings And Watercolours written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
Search For T Channel Single Top Quark Production In P Anti P Collisions At 1 96 Tev
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Author : Philip Michael Perea
language : en
Publisher:
Release Date : 2006
Search For T Channel Single Top Quark Production In P Anti P Collisions At 1 96 Tev written by Philip Michael Perea and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
I have performed a search for t-channel single top quark production in p{bar p} collisions at 1.96 TeV on a 366 pb{sup -1} dataset collected with the D0 detector from 2002-2005. The analysis is restricted to the leptonic decay of the W boson from the top quark to an electron or muon, tq{bar b} {yields} lv{sub l}b q{bar b} (l = e, {mu}). A powerful b-quark tagging algorithm derived from neural networks is used to identify b jets and significantly reduce background. I further use neural networks to discriminate signal from background, and apply a binned likelihood calculation to the neural network output distributions to derive the final limits. No direct observation of single top quark production has been made, and I report expected/measured 95% confidence level limits of 3.5/8.0 pb.
Observation Of Single Top Quark Production
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Author :
language : en
Publisher:
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.