Evidence Of Ww Wz Production With Lepton Jets Final States In P Anti P Collisions At S1 2 PDF Download
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| Total Pages | : 9 |
| Release | : 2008 |
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Download Evidence of WW+WZ Production with Lepton + Jets Final States in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
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.
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| Total Pages | : 23 |
| Release | : 2007 |
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Download Search for New Particles Leading to Z+jets Final States in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
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| Total Pages | : 23 |
| Release | : 2007 |
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Download Search for New Particles Leading to Z+jets Final States in P Anti-p Collisions at S**ư Book in PDF, ePub and Kindle
We present the results of a search for new particles that lead to a Z boson plus jets in p{bar p} collisions at √s = 1.96 TeV using the Collider Detector at Fermilab (CDF II). A data sample with a luminosity of 1.06 fb−1 collected using Z boson decays to ee and?? is used. We describe a completely data-based method to predict the dominant background from standard-model Z+jet events. This method can be similarly applied to other analyses requiring background predictions in multi-jet environments, as shown when validating the method by predicting the background from W+jets in t{bar t} production. No significant excess above the background prediction is observed, and a limit is set using a fourth generation quark model to quantify the acceptance. Assuming BR(b′ → bZ) = 100% and using a leading-order calculation of the b′ cross section, b′ quark masses below 268 GeV/c2 are excluded at 95% confidence level.
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| Total Pages | : 214 |
| Release | : 2009 |
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Download First Evidence for WW and WZ Diboson Production with Semi-leptonic Decays at a Hadron Collider Book in PDF, ePub and Kindle
Presented is a measurement of the simultaneous production of a W{sup ±} boson in association with a second weak boson (W{sup ±} or Z°) in p{bar p} collisions at √s = 1.96 TeV. Events are consider with one electron or one muon, missing transverse energy, and at least two hadronic jets. The data were collected by the D0 detector in Run IIa of the Tevatron accelerator and correspond to 1.07 fb−1 of integrated luminosity for each of the two channels (WW/WZ → e[nu]q{bar q} and WW/WZ → [mu][nu]q{bar q}). The cross section for WW + WZ production is measured to be 20.2 ± 2.5(stat) {+-} 3.6(sys) {+-} 1.2(lum) pb with a Gaussian significance of 4.4 standard deviations above the background-only scenario. This measurement is consistent with the Standard Model prediction and represents the first direct evidence for WW and WZ production with semi-leptonic decays at a hadron collider.
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| Total Pages | : 7 |
| Release | : 1994 |
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Download A Search for T{anti T} → Lepton + E{sub T} + Jets Signature in P{anti P} Collisions at √s Book in PDF, ePub and Kindle
The authors report the results from a search for t{anti t} production in p{anti p} collisions at √s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p{sub T} lepton (e or?), multiple jets and a substantial missing transverse energy (E{sub T}), excluding the events that have?-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb−1 of data taken during the 1992--1993 run of the Tevatron.
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| Release | : 2005 |
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Download A Search for T[anti T] [yields] Lepton + E[sub T] + Jets Signature in P[anti P] Collisions at [radical] Book in PDF, ePub and Kindle
The authors report the results from a search for t[anti t] production in p[anti p] collisions at [radical]s = 1.8 TeV with the D0 detector at Fermilab in the final states consisting of one isolated high p[sub T] lepton (e or [mu]), multiple jets and a substantial missing transverse energy (E[sub T]), excluding the events that have [mu]-tagged jets. Two independent analysis approaches lead them to similar estimates for the cross-section. They see no conclusive evidence for top production in the 13.5 pb[sup [minus]1] of data taken during the 1992--1993 run of the Tevatron.
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| Total Pages | : 39 |
| Release | : 2008 |
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Download Two-Particle Momentum Correlations in Jets Produced in P Antip Collisions at S**1/2 Book in PDF, ePub and Kindle
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| Total Pages | : 7 |
| Release | : 2005 |
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Download Production of WZ Events in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
The authors present results from a search for WZ production with subsequent decay to l[nu]l'{bar l}' (l and {ell}' = e or [mu]) using 0.30 fb−1 of data collected by the D0 experiment between 2002 and 2004 at the Tevatron. Three events with WZ decay characteristics are observed. With an estimated background of 0.71 ± 0.08 events, we measure the WZ production cross section to be 4.5{sub -2.6}{sup +3.8} pb, with a 95% C.L. upper limit of 13.3 pb. The 95% C.L. limits for anomalous WWZ couplings are found to be -2.0
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| Total Pages | : 39 |
| Release | : 2008 |
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Download Two-Particle Momentum Correlations in Jets Produced in P Antip Collisions at S**ư Book in PDF, ePub and Kindle
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| Release | : 2016 |
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Download Measurement of WW and WZ Production in the Lepton Plus Heavy Flavor Jets Final State at CDF. Book in PDF, ePub and Kindle
We present the CDF measurement of the diboson WW and WZ production cross section in a final state consistent with leptonic W decay and jets originating from heavy flavor quarks, based on the full Tevatron Run II dataset. The analysis of the di-jet invariant mass spectrum allows the observation of 3.7 sigma evidence for the combined production processes of either WW or WZ bosons. The different heavy flavor decay pattern of the W and Z bosons and the analysis of the secondary-decay vertex properties allow to independently measure the WW and WZ production cross section in a hadronic final state. The measured cross sections are consistent with the standard model predictions and correspond to signal significances of 2.9 and 2.1 sigma for WW and WZ production, respectively.
