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Evidence For Electroweak Top Quark Production In Proton Antiproton Collisions At U221as
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Book Synopsis Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at {u221A}s by :
Download or read book Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at {u221A}s written by and published by . This book was released on 2007 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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: ?(p$ar{p}$ → tb + tqb + X) = 4.6$+top{-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?.
Book Synopsis Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at Sqrt(s) by : Thomas Gadfort
Download or read book Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at Sqrt(s) written by Thomas Gadfort and published by . This book was released on 2007 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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: spp&d1;→ tb+tqb+X=4.6+1.8-1.5 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 2.9sigma.
Book Synopsis Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at S**1/2 by :
Download or read book Evidence for Electroweak Top Quark Production in Proton-antiproton Collisions at S**1/2 written by and published by . This book was released on 2007 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
Author :Stelzer, Bernd Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494078129 Total Pages :256 pages Book Rating :4.0/5 (781 download)
Book Synopsis Search for Electroweak Single Top Quark Production in 1.96 TeV Proton-antiproton Collisions [microform] by : Stelzer, Bernd
Download or read book Search for Electroweak Single Top Quark Production in 1.96 TeV Proton-antiproton Collisions [microform] written by Stelzer, Bernd and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the first search for electroweak single top quark production in proton-antiproton collisions at a center of mass energy of 1.96 TeV. The data sample used for this analysis corresponds to 162 pb -1 recorded by the upgraded Collider Detector at Fermilab. The search is performed by doing a classic maximum likelihood fit to the H T distribution in data. The kinematic variable H T is the scalar sum of transverse energies of all final state particles in the event. This variable has the advantage that its distribution looks very similar for both contributing (s-channel and t-channel) single top processes, but is different for background processes. The combination of both channels to one signal improves the sensitivity of the search. No significant evidence for electroweak single top quark production is found and we set an upper limit at the 95% confidence level on the combined single top quark production cross section of 17.8 pb.
Book Synopsis Search for Electroweak Single Top Quark Production in 1.96-TeV Proton-antiproton Collisions by : Bernd Stelzer
Download or read book Search for Electroweak Single Top Quark Production in 1.96-TeV Proton-antiproton Collisions written by Bernd Stelzer and published by . This book was released on 2005 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the first search for electroweak single top quark production in proton-antiproton collisions at a center of mass energy of 1.96 TeV. The data sample used for this analysis corresponds to 162 pb{sup -1} recorded by the upgraded Collider Detector at Fermilab. The search is performed by doing a classic maximum likelihood fit to the H{sub T} distribution in data. The kinematic variable H{sub T} is the scalar sum of transverse energies of all final state particles in the event. This variable has the advantage that its distribution looks very similar for both contributing (s-channel and t-channel) single top processes, but is different for background processes. The combination of both channels to one signal improves the sensitivity of the search. No significant evidence for electroweak single top quark production is found and we set an upper limit at the 95% confidence level on the combined single top quark production cross section of 17.8 pb.
Book Synopsis Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at {u221A}s by :
Download or read book Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at {u221A}s written by and published by . This book was released on 2005 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis two searches for electroweak single top quark production with the CDF experiment have been presented, a cutbased search and an iterated discriminant analysis. Both searches find no significant evidence for electroweak single top production using a data set corresponding to an integrated luminosity of 162 pb-1 collected with CDF. Therefore limits on s- and t-channel single top production are determined using a likelihood technique. For the cutbased search a likelihood function based on lepton charge times pseudorapidity of the non-bottom jet was used if exactly one bottom jet was identified in the event. In case of two identified bottom jets a likelihood function based on the total number of observed events was used. The systematic uncertainties have been treated in a Bayesian approach, all sources of systematic uncertainties have been integrated out. An improved signal modeling using the MadEvent Monte Carlo program matched to NLO calculations has been used. The obtained limits for the s- and t-channel single top production cross sections are 13.6 pb and 10.1 pb, respectively. To date, these are most stringent limits published for the s- and the t-channel single top quark production modes.
Book Synopsis Measurement of Electroweak Single Top Quark Production in Proton-antiproton Collisions at 1.96 TeV by : Peter Joseph Dong
Download or read book Measurement of Electroweak Single Top Quark Production in Proton-antiproton Collisions at 1.96 TeV written by Peter Joseph Dong and published by . This book was released on 2008 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) by : Thorsten Walter
Download or read book Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) written by Thorsten Walter and published by . This book was released on 2005 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis two searches for electroweak single top quark production with the CDF experiment have been presented, a cutbased search and an iterated discriminant analysis. Both searches find no significant evidence for electroweak single top production using a data set corresponding to an integrated luminosity of 162 pb{sup -1} collected with CDF. Therefore limits on s- and t-channel single top production are determined using a likelihood technique. For the cutbased search a likelihood function based on lepton charge times pseudorapidity of the non-bottom jet was used if exactly one bottom jet was identified in the event. In case of two identified bottom jets a likelihood function based on the total number of observed events was used. The systematic uncertainties have been treated in a Bayesian approach, all sources of systematic uncertainties have been integrated out. An improved signal modeling using the MadEvent Monte Carlo program matched to NLO calculations has been used. The obtained limits for the s- and t-channel single top production cross sections are 13.6 pb and 10.1 pb, respectively. To date, these are most stringent limits published for the s- and the t-channel single top quark production modes.
Book Synopsis Suche nach elektroschwacher Erzeugung einzelner Top-Quarks mit dem CDF-Experiment in Proton-Antiproton-Kollisionen bei 1,96 TEV Schwerpunktsenergie by : Thorsten Walter
Download or read book Suche nach elektroschwacher Erzeugung einzelner Top-Quarks mit dem CDF-Experiment in Proton-Antiproton-Kollisionen bei 1,96 TEV Schwerpunktsenergie written by Thorsten Walter and published by . This book was released on 2005 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) by :
Download or read book Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Not Provided.
Book Synopsis Search for Electroweak Single Top Quark Production with CDF in Proton Antiproton Collisions at S by : Thorsten Walter
Download or read book Search for Electroweak Single Top Quark Production with CDF in Proton Antiproton Collisions at S written by Thorsten Walter and published by . This book was released on 2005 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Electroweak Top Quark Production in the Electron + Jets Channel in the D0 Experiment at the Tevatron by : Emmanuel Busato
Download or read book Search for Electroweak Top Quark Production in the Electron + Jets Channel in the D0 Experiment at the Tevatron written by Emmanuel Busato and published by . This book was released on 2005 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Electroweak Single Top Quark Production in Proton-antiproton Collisions at 1.96 TeV. by :
Download or read book Measurement of Electroweak Single Top Quark Production in Proton-antiproton Collisions at 1.96 TeV. written by and published by . This book was released on 2008 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark is an extremely massive fundamental particle that is predominantly produced in pairs at particle collider experiments. The Standard Model of particle physics predicts that top quarks can also be produced singly by the electroweak force; however, this process is more difficult to detect because it occurs at a smaller rate and is more difficult to distinguish from background processes. The cross section of this process is related to the Cabbibo-Kobayashi-Maskawa matrix element.
Book Synopsis Evidence for Single Top-quark Production in the S-channel in Proton{u2013}proton Collisions at {u221A}s by :
Download or read book Evidence for Single Top-quark Production in the S-channel in Proton{u2013}proton Collisions at {u221A}s written by and published by . This book was released on 2016 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Letter presents evidence for single top-quark production in the s-channel using proton–proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b-tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb-1. The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s-channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of ?s = 4.8 ± 0.8(stat.)-1.3+1.6(syst.) pb, which is consistent with the Standard Model expectation. As a result, the expected significance for the analysis is 3.9 standard deviations.
Book Synopsis Measurement of Electroweak Top Quark Production at {D\O} by :
Download or read book Measurement of Electroweak Top Quark Production at {D\O} written by and published by . This book was released on 2013 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new model-independent measurement of the electroweak single top-quark production cross section in proton-antiproton (p- $\bar{p}$) collisions at √s = 1.96 TeV in 9.7 fb-1 of integrated luminosity collected with the DØ detector.
Book Synopsis Measurement of the Single Top Production Cross Section in Proton-antiproton Collisions at 1.96 TeV. by :
Download or read book Measurement of the Single Top Production Cross Section in Proton-antiproton Collisions at 1.96 TeV. written by and published by . This book was released on 2010 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for singly produced top quarks via an electroweak vertex in head-on proton-antiproton collisions at a center of mass energy of √s = 1.96 TeV. The analysis uses a total of 2.3 fb−1 of data collected with the D0 detector at Fermilab, corresponding to two different run periods of the Tevatron collider. Two channels contribute to single top quark production at the Tevatron, the s-channel and the t-channel. In the s-channel, a virtual W boson is produced from the aniquilation of a quark and an antiquark and a top and a bottom quarks are produced from the W decay. The top quark decays almost exclusively into a W boson and a bottom quark. Final states are considered in which the W boson decays leptonically into an electron or a muon plus a neutrino. Thus, at the detector level, the final state characterizing the s-channel contains one lepton, missing energy accounting for the neutrino, and two jets from the two bottom quarks. In the t-channel, the final state has an additional jet coming from a light quark. Clearly, a precise reconstruction of the events requires a precise measurement of the energy of the jets. A multivariate technique, Bayesian neural networks, is used to extract the single top signal from the overwhelming background still left after event selection. A Bayesian likelihood probability is then computed to measure the single top cross section. Assuming the observed excess is due to single top events, the measured single top quark production cross section is [sigma](p{bar p} → tb + X, tqb + X) = 4.70{sub -0.93}{sup +1.18} pb. The observed excess is associated with a p-value of (3.2 ± 2.3) x 10−8, assuming the background-only hypothesis. This p-value corresponds to an excess over background of 5.4 standard deviations for a Gaussian density. The p-value computed using the standard model signal cross section of 3.46 pb is (22.7 ± 0.6) x 10−6, corresponding to an expected significance of 4.08 standard deviations.
Book Synopsis Measurement of the Top Quark Production Cross Section in Proton-antiproton Collisions at 1.8 TeV Center of Mass Energy by : Peter Dominic Tamburello
Download or read book Measurement of the Top Quark Production Cross Section in Proton-antiproton Collisions at 1.8 TeV Center of Mass Energy written by Peter Dominic Tamburello and published by . This book was released on 1998 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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