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Search For Wz Zz Production In The Leptons Met Jets Channel With The Cdf Experiment At The Tevatron Collider
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Book Synopsis Search for $WZ/ZZ$ Production in the Lepton(s) + MET + Jets Channel with the CDF Experiment at the Tevatron Collider by :
Download or read book Search for $WZ/ZZ$ Production in the Lepton(s) + MET + Jets Channel with the CDF Experiment at the Tevatron Collider written by and published by . This book was released on 2014 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we present a search for the WZ and ZZ production in a final state ("W+2 jets") with a leptonically-decaying W and two energetic jets. We use the full dataset (+"Ldt = 8:9 fb-1) recorded with the CDF detector at Fermilab. The challenge consists in extracting the small Z-hadronic peak from the large amount of background processes. Those processes also include the WW, whose hadronic peak cannot be distinguished from the Z peak, due to the poor calorimeter resolution. In the past such a signature was used to measure the diboson cross section, which is highly dominated by the WW cross section.
Book Synopsis Search for ZW/ZZ Going to Lepton+ Lepton- Jets Production in Proton-proton Collisions at CDF. by : Wesley Ketchum
Download or read book Search for ZW/ZZ Going to Lepton+ Lepton- Jets Production in Proton-proton Collisions at CDF. written by Wesley Ketchum and published by . This book was released on 2012 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of particle physics describes weak interactions mediated by massive gauge bosons that interact with each other in well-defined ways. Observations of the production and decay of WW, WZ, and ZZ boson pairs are an opportunity to check that these self-interactions agree with the Standard Model predictions. Furthermore, final states that include quarks are very similar to the most prominent final state of Higgs bosons produced in association with a W or Z boson. Diboson production where WW is a significant component has been observed at the Tevatron collider in semi-hadronic decay modes. We present a search for ZW and ZZ production in a final state containing two charged leptons and two jets using 8.9 fb−1 of data recorded with the CDF detector at the Tevatron. We select events by identifying those that contain two charged leptons, two hadronic jets, and low transverse missing energy ( E /T ). We increase our acceptance by using a wide suite of high- pT lepton triggers and by relaxing many lepton identification requirements. We develop a new method for calculating corrections to jet energies based on whether the originating parton was a quark or gluon to improve the agreement between data and the Monte Carlo simulations used to model our diboson signal and dominant backgrounds. We also make use of neural-network-based discriminants that are trained to pick out jets originating from b quarks and light-flavor quarks, thereby increasing our sensitivity to Z → bb ̄ and W/Z → qq ̄' decays, respectively. The number of signal events is extracted through a simultaneous fit to the dijet mass spectrum in three channels: a heavy-flavor tagged channel, a light-flavor tagged channel, and an untagged channel. We measure σZW/ZZ = 2.5+2.0-1.0 pb, which is consistent with the SM cross section of 5.1 pb. We establish an upper limit on the cross section of σZW/ZZ
Book Synopsis W/Z + Jets Production at the Tevatron by :
Download or read book W/Z + Jets Production at the Tevatron written by and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both the D0 and CDF experiments at Fermilab Tevatron collider at √s = 1.8 TeV have accumulated over 50pb−1 of data. Each experiment collected more than 50,000 W → l +v and 5000 Z → l + {bar l} candidates for each lepton species (e and [mu]). Using this large data sample of W and Z candidates, the two experiments are actively testing perturbative QCD predictions. Among the studies that are in progress, preliminary results of W/Z+jets characteristics, multiplicity distributions of associated jets, and a study on the determination of the strong coupling constant using the ratio of the W+1 jet to W + 0 jet cross sections are presented.
Book Synopsis A Novel Technique to Reconstruct the $Z$ Mass in $WZ/ZZ$ Events with Lepton(s), Missing Transverse Energy and Three Jets at CDFII. by :
Download or read book A Novel Technique to Reconstruct the $Z$ Mass in $WZ/ZZ$ Events with Lepton(s), Missing Transverse Energy and Three Jets at CDFII. written by and published by . This book was released on 2012 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observing WZ/ZZ production at the Tevatron in a final state with a lepton, missing transverse energy and jets is extremely difficult because of the low signal rate and the huge background. In an attempt to increase the acceptance we study the sample where three high-energy jets are reconstructed, where about 1/3 of the diboson signal events are expected to end. Rather than choosing the two E{sub T}-leading jets to detect a Z signal, we make use of the information carried by all jets. To qualify the potential of our method, we estimate the probability of observing an inclusive diboson signal at the three standard deviations level (P{sub 3{sigma}}) to be about four times larger than when using the two leading jets only. Aiming at applying the method to the search for the exclusive WZ/ZZ → l?q{bar q} channel in the three jets sample, we analyzed separately the sample with at least one b-tagged jet and the sample with no tags. In WZ/ZZ → l?b{bar b} search, we observe a modest improvement in sensitivity over the option of building the Z-mass from the two leading jets in E{sub T}. Studies for improving the method further are on-going.
Download or read book Mémorandum sur le boycottage written by and published by . This book was released on 1932 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Production of ZW and ZZ Boson Pairs Decaying Into Charged Leptons and Jets in Proton-antiproton Collisions at Sqrt[s] by :
Download or read book Search for the Production of ZW and ZZ Boson Pairs Decaying Into Charged Leptons and Jets in Proton-antiproton Collisions at Sqrt[s] written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the production cross section for ZW and ZZ boson pairs in final states with a pair of charged leptons, from the decay of a Z boson, and at least two jets, from the decay of a W or Z boson, using the full sample of proton-antiproton collisions recorded with the CDF II detector at the Tevatron, corresponding to 8.9 fb(̂-1) of integrated luminosity. We increase the sensitivity to vector boson decays into pairs of quarks using a neural network discriminant that exploits the differences between the spatial spread of energy depositions and charged-particle momenta contained within the jet of particles originating from quarks and gluons. Additionally, we employ new jet energy corrections to Monte Carlo simulations that account for differences in the observed energy scales for quark and gluon jets. The number of signal events is extracted through a simultaneous fit to the dijet mass spectrum in three classes of events: events likely to contain jets with a heavy-quark decay, events likely to contain jets originating from light quarks, and events that fail these identification criteria. We determine the production cross section to be 2.5 +2.0 -1.0 pb (
Book Synopsis Evidence of WW+WZ Production with Lepton + Jets Final States in P Anti-p Collisions at S**1/2 by :
Download or read book Evidence of WW+WZ Production with Lepton + Jets Final States in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2008 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the first evidence of WW+WZ production with lepton+jets final states at a hadron collider. The data correspond to 1.07 inverse femtobarns of integrated luminosity collected with the D0 detector at the Fermilab Tevatron Collider in proton-antiproton collisions at sqrt(s)=1.96 TeV. The observed cross section for WW+WZ production is 20.2 +/- 4.5 pb, consistent with the SM prediction of 16.1 +/- 0.9 pb. The probability for background fluctuations to produce an excess equal to or larger than that observed is estimated to be 5.4e-6, corresponding to a significance of 4.4 standard deviations.
Book Synopsis Search for WZ+ZZ Production with Missing Transverse Energy and B Jets at CDF. by :
Download or read book Search for WZ+ZZ Production with Missing Transverse Energy and B Jets at CDF. written by and published by . This book was released on 2013 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Observation of diboson processes at hadron colliders is an important milestone on the road to discovery or exclusion of the standard model Higgs boson. Since the decay processes happen to be closely related, methods, tools, and insights obtained through the more common diboson decays can be incorporated into low-mass standard model Higgs searches. The combined WW + WZ + ZZ diboson cross section has been measured at the Tevatron in hadronic decay modes. In this thesis we take this one step closer to the Higgs by measuring just the WZ + ZZ cross section, exploiting a novel arti cial neural network based b-jet tagger to separate the WW background. The number of signal events is extracted from data events with large ET using a simultaneous t in events with and without two jets consistent with B hadron decays. Using 5:2 fb-1 of data from the CDF II detector, we measure a cross section of (p $\bar{p}$ 2!WZ, ZZ) = 5:8+3.6 -3.0 pb, in agreement with the standard model.
Book Synopsis Experimental Study of W Z Intermediate Bosons Associated Production with the CDF Experiment at the Tevatron Collider by :
Download or read book Experimental Study of W Z Intermediate Bosons Associated Production with the CDF Experiment at the Tevatron Collider written by and published by . This book was released on 2007 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for WZ+ZZ Production with Missing Transverse Energy and B Jets at CDF by : Stephen Thomas Poprocki
Download or read book Search for WZ+ZZ Production with Missing Transverse Energy and B Jets at CDF written by Stephen Thomas Poprocki and published by . This book was released on 2013 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for $WZ+ZZ$ Production with MET + Jets with $b$ Enhancement at $\sqrt{s} by :
Download or read book Search for $WZ+ZZ$ Production with MET + Jets with $b$ Enhancement at $\sqrt{s} written by and published by . This book was released on 2011 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diboson production (WW + WZ + ZZ) has been observed at the Tevatron in hadronic decay modes dominated by the WW process. This paper describes the measurement of the cross section of WZ and ZZ events in final states with large E{sub T} and using b-jet identification as a tool to suppress WW contributions. Due to the limited energy resolution, we cannot distinguish between partially hadronic decays of WZ and ZZ, and we measure the sum of these processes. The number of signal events is extracted using a simultaneous fit to the invariant mass distribution of the two jets for events with two b-jet candidates and events without two b-jet candidates. We measure a cross section [sigma](p{bar p} 2!WZ, ZZ) = 5.8{sub -3.0}{sup +3.6} pb, in agreement with the standard model.
Download or read book Diboson Production at written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent diboson production measurements from the D0 experiment at Fermilab's Tevatron collider. The production of ZZ was observed using leptonic final states. Z[gamma] → vv[gamma] was observed and used to set the most stringent limits from a hadron collider on anomalous Z[gamma][gamma] and ZZ[gamma] trilinear gauge couplings (TGCs). WW events with leptonic final states and WW + WZ events with semi-leptonic final states were used to set limits on anomalous WWZ and WW[gamma] TGCs. Finally, limits on anomalous WWZ and WW[gamma] TGCs were obtained from a combination of the fully-leptonic W[gamma], WW, and WZ channels and the semi-leptonic WW and WZ channels, giving the most stringent limits from a hadron collider.
Book Synopsis Search for WZ Production in the Trilepton Channel at the Tevatron and Limits on the WWZ Vertex Anomalous Couplings by :
Download or read book Search for WZ Production in the Trilepton Channel at the Tevatron and Limits on the WWZ Vertex Anomalous Couplings written by and published by . This book was released on 1998 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for WZ production through the study of the reaction p $\bar{p}$→ l $bar{v}$ee+X (l = e, [mu]) at √s = 1.8 TeV using the D0 detector at Fermilab is presented.
Download or read book CERN Courier written by and published by . This book was released on 2011 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Anomalous Couplings in WW and WZ Measurements at the Tevatron (D0 and CDF Results). by :
Download or read book Search for Anomalous Couplings in WW and WZ Measurements at the Tevatron (D0 and CDF Results). written by and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for WW and WZ production in p{anti p} collisions at √s = 1.8 TeV using the CDF and D0 detectors is presented. Three analyses, one concentrating on the leptons + jets decay channels and two concentrating on the dilepton decay channels are described in detail. Limits on anomalous WW[gamma] and WWZ trilinear gauge boson couplings are presented. Prospects for further study of diboson production and anomalous couplings with the Upgraded Tevatron are also presented.
Download or read book Diboson Physics at CDF. written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article presents the most recent results of the diboson production properties, using up to ∫ Ldt = 1.9 fb−1 of data taken with the CDF Run II detector, at Tevatron. We summarize measurements of the W[gamma], Z[gamma], WW, WZ and ZZ production cross sections in leptonic channels. A search for the combined WW and WZ production in lepton-neutrino plus dijet final states is also presented.
Download or read book Jets in CDF. written by and published by . This book was released on 1991 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the 1988/89 Tevatron Collider run the CDF experiment collected 4.0 {plus minus} 0.3 pb−1 of proton-antiproton interactions at a center-of-mass collision energy currently available in the laboratory and gives us a unique opportunity for studying Quantum Chromodymanics (QCD) processes at the highest available energies. We report results from various QCD studies performed with this data. 11 refs., 8 figs.
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