Measurement Of The Top Pair Production Cross Section And The W Boson Polarization In Top Dilepton Decay In Ppbar Collisions At Sqrt S
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Measurement Of The Top Pair Production Cross Section And The W Boson Polarization In Top Dilepton Decay In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The Top Pair Production Cross Section And The W Boson Polarization In Top Dilepton Decay In Ppbar 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.
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The Top Pair Production Cross Section In The Dilepton Decay Channel In Ppbar 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.
A measurement of the t{bar t} production cross section in p{bar p} collisions at √s = 1.96 TeV using events with two leptons, missing transverse energy, and jets is reported. The data were collected with the CDF II Detector. The result in a data sample corresponding to an integrated luminosity 2.8 fb−1 is: [sigma]{sub t{bar t}} = 6.27 ± 0.739(stat) ± 0.63(syst) ± 0.39(lum) pb for an assumed top mass of 175 GeV/c2.
Measurement Of W Boson Polarization In Top Quark Decay In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of W Boson Polarization In Top Quark Decay In Ppbar 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 measurements of the polarization of W bosons from top-quark decays using 2.7 fb−1 of p{bar p} collisions collected by the CDF II detector. Assuming a top-quark mass of 175 GeV/c2, three measurements are performed. A simultaneous measurement of the fraction of longitudinal (f0) and right-handed (f+) W bosons yields the model-independent results f0 = 0.88 ± 0.11(stat) ± 0.06(syst) and f+ = -0.15 ± 0.07(stat) ± 0.06(syst) with a correlation coefficient of -0.59. A measurement of f0 (f+) constraining f+ (f0) to its standard model value of 0.0 (0.7) yields f0 = 0.70 ± 0.07(stat) ± 0.04(syst) (f+ = 0.01 ± 0.02(stat) ± 0.05(syst)). All these results are consistent with standard model expectations.
Measurement Of The Ttbar Production Cross Section In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Measurement Of The Ttbar Production Cross Section In Ppbar 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 present a measurement of the top quark pair production cross section in p{bar p} collisions at √s = 1.96 TeV using a data sample corresponding to 1.7 fb−1 of integrated luminosity collected with the Collider Detector at Fermilab. We reconstruct t{bar t} events in the lepton+jets channel, consisting of e[nu]+jets and [mu][nu]+jets final states. The dominant background is the production of W bosons in association with multiple jets. To suppress this background, we identify electrons from the semileptonic decay of heavy-flavor jets ('soft electron tags'). From a sample of 2196 candidate events, we obtain 120 tagged events with a background expectation of 51 ± 3 events, corresponding to a cross section of [sigma]{sub t{bar t}} = 7.8 ± 2.4 (stat) ± 1.6 (syst) ± 0.5 (lumi) pb. We assume a top-quark mass of 175 GeV/c2. This is the first measurement of the t{bar t} cross section with soft electron tags in Run II of the Tevatron.
First Measurement Of The Cross Section For Top Quark Pair Production In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
First Measurement Of The Cross Section For Top Quark Pair Production In Proton Proton 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.
The first measurement of the cross section for top-quark pair production in pp collisions at the LHC at center-of-mass energy sqrt(s)= 7 TeV has been performed using 3.1 {\pm} 0.3 inverse pb of data recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from Drell-Yan and non-W/Z boson production are estimated from data. Eleven events are observed in the data with 2.1 {\pm} 1.0 events expected from background. The measured cross section is 194 {\pm} 72 (stat.) {\pm} 24 (syst.) {\pm} 21 (lumi.) pb, consistent with next-to-leading order predictions.
Measurement Of The Inclusive T Bar T Production Cross Section In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Inclusive T Bar T Production Cross Section 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 2016 with categories.
The inclusive cross section of top quark-antiquark pairs produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV is measured in the lepton+jets and dilepton decay channels. The data sample corresponds to 9.7 fb-1 of integrated luminosity recorded with the D0 detector during Run II of the Fermilab Tevatron Collider. Employing multivariate analysis techniques we measure the cross section in the two decay channels and we perform a combined cross section measurement. For a top quark mass of 172.5 GeV, we measure a combined inclusive top quark-antiquark pair production cross section of [sigma]$t\bar{t}$=7.26±0.13(stat)$+0.57\atop{-0.50}$(syst) pb which is consistent with standard model predictions. We also perform a likelihood fit to the measured and predicted top quark mass dependence of the inclusive cross section, which yields a measurement of the pole mass of the top quark. The extracted value is mt=172.8±1.1(theo)$+3.3\atop{-3.1}$(exp) GeV.
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S
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Author : Gvantsa Mchedlidze
language : en
Publisher:
Release Date : 2018
Measurement Of The W Boson Polarisation In T Bar T Dilepton Events At Sqrt S written by Gvantsa Mchedlidze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
A measurement of the $W$ boson polarisation in top quark decays is presented. The top anti-top pairs were produced at a centre of mass energy of $\sqrt{s}=8$ \tev \ using proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of$\int{\mathcal{L}dt}=20.2$ fb$^{-1}$ recorded by the ATLAS detector in 2012. The measurement was performed in the dilepton channel, which is characterised by two leptons (electron or muon) with opposite electric charge, missing transverse energy from two neutrinos, and at least two jets. One of these jets is required to be tagged ...
Measurement Of The Cross Section For W Boson Production In Association With Jets In Ppbar Collisions At S
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of The Cross Section For W Boson Production In Association With Jets In Ppbar Collisions At 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 2007 with categories.
We present a measurement of the cross section for W-boson production in association with jets in p{bar p} collisions at √s = 1.96 TeV. The analysis uses a data sample corresponding to an integrated luminosity of 320 pb−1 collected with the CDF II detector. W bosons are identified in their electron decay channel and jets are reconstructed using a cone algorithm. For each W + ≥ n-jet sample (n = 1-4) we measure?(p{bar p} → W + ≥ n-jet) x?(W → e?) with respect to the transverse energy E{sub T} of the nth-highest E{sub T} jet above 20 GeV, for a restricted W → e? decay phase space. The cross sections, corrected for all detector effects, can be directly compared to particle level W + jet(s) predictions. We present here comparisons to leading order and next-to-leading order predictions.
Large Pt Processes In Ppbar Collisions At 2 Tev
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Author : Ashish Kumar
language : en
Publisher:
Release Date : 2005
Large Pt Processes In Ppbar Collisions At 2 Tev written by Ashish Kumar 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.
The measurement of the top-antitop pair production cross section in p{bar p} collisions at {radical}s = 1.96 TeV in the dielectron decay channel using 384 pb{sup -1} of D0 data yields a t{bar t} production cross-section of {sigma}{sub t{bar t}} = 7.9{sub -3.8}{sup +5.2}(stat){sub -1.0}{sup +1.3}(syst) {+-} 0.5 (lumi) pb. This measurement [98] is based on 5 observed events with a prediction of 1.04 background events. The cross-section corresponds to the top mass of 175 GeV, and is in good agreement with the Standard Model expectation of 6.77 {+-} 0.42 pb based on next-to-next-leading-order (NNLO) perturbative QCD calculations [78]. This analysis shows significant improvement from our previous cross-section measurement in this channel [93] with 230 pb{sup -1} dataset in terms of significantly better signal to background ratio and uncertainties on the measured cross-section. Combination of all the dilepton final states [98] yields a yields a t{bar t} cross-section of {sigma}{sub t{bar t}} = 8.6{sub -2.0}{sup +2.3}(stat){sub -1.0}{sup +1.2}(syst) {+-} 0.6(lumi) pb, which again is in good agreement with theoretical predictions and with measurements in other final states. Hence, these results show no discernible deviation from the Standard Model. Fig. 6.1 shows the summary of cross-section measurements in different final states by the D0 in Run II. This measurement of cross-section in the dilepton channels is the best dilepton result from D0 till date. Previous D0 result based on analysis of 230 pb{sup -1} of data (currently under publication in Physics Letters B) is {sigma}{sub t{bar t}} = 8.6{sub -2.7}{sup +3.2}(stat){sub -1.1}{sup +1.1}(syst) {+-} 0.6(lumi) pb. It can be seen that the present cross-section suffers from less statistical uncertainty. This result is also quite consistent with CDF collaboration's result of {sigma}{sub t{bar t}} = 8.6{sub -2.4}{sup +2.5}(stat){sub -1.1}{sup +1.1}(syst) pb. These results have been presented as D0's preliminary results in the high energy physics conferences in the Summer of 2005 (Hadron Collider Physics Symposium, European Physical Society Conference, etc.). The uncertainty on the cross-section is still dominated by statistics due to the small number of observed events. It can be seen that we are at a level where statistical uncertainties are becoming closer to the systematic ones. Future measurements of the cross section will benefit from considerably more integrated luminosity, leading to a smaller statistical error. Thus the next generation of measurements will be limited by systematic uncertainties. Monte Carlo samples with higher statistics are also being generated in order to decrease the uncertainty on the background estimation. In addition, as the jet energy scale, the electron energy scale, the detector resolutions, and the luminosity measurement are fine-tuned, the systematic uncertainties will continue to decrease.
Measurement Of The Top Pair Production Cross Section In The Dilepton Channel In Proton Antiproton Collisions At Square Root S
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Author : Mircea Norocel Coca
language : en
Publisher:
Release Date : 2005
Measurement Of The Top Pair Production Cross Section In The Dilepton Channel In Proton Antiproton Collisions At Square Root S written by Mircea Norocel Coca 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.