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Measurement Of Jet Activity In Top Quark Events Using The Emu Final State With Two B Tagged Jets In Pp Collisions At Sqrts
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Book Synopsis Measurement of Jets Produced in Top Quark Events Using the Emu Final State with 2 B-tagged Jets in Pp Collisions at 8 TeV with the ATLAS Detector by : Jacquelyn Kay Brosamer
Download or read book Measurement of Jets Produced in Top Quark Events Using the Emu Final State with 2 B-tagged Jets in Pp Collisions at 8 TeV with the ATLAS Detector written by Jacquelyn Kay Brosamer and published by . This book was released on 2016 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transverse momentum and multiplicity of jets produced in top quark events are measured using 20.3 inverse fb of pp collision data at a center-of-mass energy of 8 tev. Jets are selected from top events requiring an opposite-charge $e\mu$ pair and two b-tagged jets in the final state. The data are corrected to obtain the particle-level fiducial cross section for additional jets with rank 1-4, where rank=1 is the leading additional jet. These distributions are used to obtain the extra jet multiplicity as a function of minimum jet pt threshold. The results are compared with several next to leading order Monte Carlo generators. The resulting measurements can be used to tune Monte Carlo QCD modelling and may also reduce associated modelling uncertainties for LHC top quark physics measurements.
Book Synopsis Measurement of Jet Activity in Top Quark Events Using the E[mu] Final State with Two B-tagged Jets in Pp Collisions at $\sqrt{s} by :
Download or read book Measurement of Jet Activity in Top Quark Events Using the E[mu] Final State with Two B-tagged Jets in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2016 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass from B-tagged Events in the Lepton Plus Jets Channel in Pp̄ Collisions at [square Root of S] by : Nathan Robert-Claire Eddy
Download or read book Measurement of the Top Quark Mass from B-tagged Events in the Lepton Plus Jets Channel in Pp̄ Collisions at [square Root of S] written by Nathan Robert-Claire Eddy and published by . This book was released on 1999 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top-quark Mass in All-jets $t\bar{t}$ Events in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the Top-quark Mass in All-jets $t\bar{t}$ Events in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2013 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mass of the top quark is measured using a sample of $t\bar{t}$ candidate events with at least six jets in the final state. The sample is selected from data collected with the CMS detector in pp collisions at $\sqrt{s}$ = 7 TeV in 2011 and corresponds to an integrated luminosity of 3.54 inverse femtobarns. The mass is reconstructed for each event employing a kinematic fit of the jets to a $t\bar{t}$ hypothesis. The top-quark mass is measured to be 173.49 $\pm$ 0.69 (stat.) $\pm$ 1.21 (syst.) GeV. A combination with previously published measurements in other decay modes by CMS yields a mass of 173.54 $\pm$ 0.33 (stat.) $\pm$ 0.96 (syst.) GeV.
Book Synopsis Measurement of the T T-bar Production Cross Section in Pp Collisions at 7 TeV in Lepton + Jets Events Using B-quark Jet Identification by :
Download or read book Measurement of the T T-bar Production Cross Section in Pp Collisions at 7 TeV in Lepton + Jets Events Using B-quark Jet Identification written by and published by . This book was released on 2011 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new measurement of the inclusive production cross section for pp to t t-bar is performed at a center-of-mass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 inverse picobarns, and is based on the final state with one isolated, high transverse momentum muon or electron, missing transverse energy, and hadronic jets. The ttbar content of the selected events is enhanced by requiring the presence of at least one jet consistent with b-quark hadronization. The measured cross section is 150 +/- 9 (stat.) +/- 17 syst.) +/- 6 (lumi.) pb and is in agreement with higher-order QCD calculations. The combination of this measurement with a previous CMS result based on dileptons gives 154 +/- 17 (stat.+syst.) +/- 6 (lumi.) pb.
Book Synopsis A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF by : Erik Matthews Brubaker
Download or read book A Measurement of the Mass of the Top Quark in Lepton + Jets Events at CDF written by Erik Matthews Brubaker and published by . This book was released on 2004 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Jet Mass in Highly Boosted T-tbar Events from Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the Jet Mass in Highly Boosted T-tbar Events from Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the jet mass m[jet] of top quark jets produced in t t-bar events from pp collisions at sqrt(s) = 8 TeV is reported for the jet with the largest transverse momentum pt in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 inverse femtobarns. The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t to bW with W to l nu where l is an electron or muon, are used to select t t-bar events with large Lorentz boosts. The products of the fully hadronic decay t to bW with W to q q'-bar are reconstructed using a single Cambridge-Aachen jet with distance parameter R=1.2, and pt>400 GeV. The t t-bar cross section as a function of m[jet] is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m[jet] distribution is sensitive to the top quark mass m[t], and the data are used to extract a value of m[t] to assess this sensitivity.
Book Synopsis Measurement of the W Boson Helicity Fractions in the Decays of Top Quark Pairs to Lepton+jets Final States Produced in Pp Collisions at Sqrt(s) by :
Download or read book Measurement of the W Boson Helicity Fractions in the Decays of Top Quark Pairs to Lepton+jets Final States Produced in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The W boson helicity fractions from top quark decays in t-tbar events are measured using data from proton-proton collisions at a centre-of-mass energy of 8 TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8 inverse-femtobarns. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F[0] = 0.681 +/- 0.012 (stat) +/- 0.023 (syst), F[L] = 0.323 +/- 0.008 (stat) +/- 0.014 (syst), and F[R] = -0.004 +/- 0.005 (stat) +/- 0.014 (syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
Book Synopsis Measurement of the Top Quark Pole Mass and QCD Radiation in Tt̄ Pair Production Using Eμ Events with B-tagged Jets in Pp Collisions at √s by : Caroline Maria Bertsche
Download or read book Measurement of the Top Quark Pole Mass and QCD Radiation in Tt̄ Pair Production Using Eμ Events with B-tagged Jets in Pp Collisions at √s written by Caroline Maria Bertsche and published by . This book was released on 2015 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Top Quark Mass in $p \bar{p}$ Collisions Using Events with Two Leptons by :
Download or read book Measurement of the Top Quark Mass in $p \bar{p}$ Collisions Using Events with Two Leptons written by and published by . This book was released on 2012 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of the top quark mass (m{sub t}) in p{bar p} collisions at √s = 1.96 TeV using t{bar t} events with two leptons (ee, e? or??) in the final state in 4.3 fb−1 of data collected with the D0 detector at the Fermilab Tevatron collider. We analyze the kinematically underconstrained dilepton events by integrating over the neutrino rapidity distributions. We reduce the dominant systematic uncertainties from jet energy calibration using a correction obtained from t{bar t} → l + jets events. We also correct jets in simulated events to replicate the quark flavor dependence of the jet response in data. In combination with our previous analysis, we measure m{sub t} = 174.0 ± 2.4(stat) ± 1.4(syst) GeV.
Book Synopsis Measurement of the C-jet Mistagging Efficiency in Tt[over-bar] Events Using Pp Collision Data at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book Measurement of the C-jet Mistagging Efficiency in Tt[over-bar] Events Using Pp Collision Data at [square Root]s written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using tt ̄ events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark-antiquark pair. The measurement utilises the relatively large and known W→cs branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at s√=13 TeV and corresponds to an integrated luminosity of 139 fb−1. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and tt ̄ decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3-17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement
Book Synopsis Measurement of the Top-quark Mass Using Missing $E_T$ + Jets Events with Secondary Vertex $b-$tagging at CDF II. by :
Download or read book Measurement of the Top-quark Mass Using Missing $E_T$ + Jets Events with Secondary Vertex $b-$tagging at CDF II. written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the Top Quark Pair Production Cross Section in Lepton + Jets Final States Using a Topological Multivariate Technique as Well as Lifetime B-Tagging in Proton - Anti-proton Collisions at S**(1/2) by :
Download or read book Measurements of the Top Quark Pair Production Cross Section in Lepton + Jets Final States Using a Topological Multivariate Technique as Well as Lifetime B-Tagging 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 Measurement of the Ratio $B(t \to Wb)/B(t \to Wq)$ in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the Ratio $B(t \to Wb)/B(t \to Wq)$ in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2014 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio of the top-quark branching fractions R=B(t to Wb)/B(t to Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the t t-bar dilepton final state with proton-proton collision data at sqrt(s)=8 TeV from an integrated luminosity of 19.7 inverse femtobarns, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R=1.014 +/- 0.003 (stat.) +/- 0.032 (syst.) is measured, in good agreement with the standard model prediction. A lower limit R> 0.955 at the 95% confidence level is obtained after requiring R ;=1, and a lower limit on the Cabibbo-Kobayashi-Maskawa matrix element abs(V[tb]) 0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t-channel single-top-quark cross section to determine the top-quark total decay width, Gamma[t]=1.36 +/- 0.02 (stat.) +0.14/-0.11 (syst.) GeV.
Book Synopsis Measurement of the Top Quark Mass in Lepton+jets Events with Secondary Vertex Tagging by :
Download or read book Measurement of the Top Quark Mass in Lepton+jets Events with Secondary Vertex Tagging written by and published by . This book was released on 2007 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the top quark mass with the matrix element method in the lepton + jets final state in D0 Run II is presented. Events with single isolated energetic charged lepton (electron or muon), exactly four calorimeter jets, and significant missing transverse energy are selected. Probabilities used to discriminate between signal and background are assumed to be proportional to differential cross-sections, calculated using event kinematics and folding in object resolutions and parton distribution functions. The event likelihoods constructed using these probabilities are varied with the top quark mass, m{sub t}, and the jet energy scale, JES, to give the smallest possible combined statistical + JES uncertainty.
Book Synopsis Measurements of the Top Quark Pair Production Cross Section in Lepton+jets Final States Using a Topological Multivariate Technique as Well as Lifetime B-tagging in Proton-antiproton Collisions at [root] by : Tobias Golling
Download or read book Measurements of the Top Quark Pair Production Cross Section in Lepton+jets Final States Using a Topological Multivariate Technique as Well as Lifetime B-tagging in Proton-antiproton Collisions at [root] written by Tobias Golling and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Top Quark Polarization in $t \overline{t}$ Lepton + Jets Final States by :
Download or read book Measurement of Top Quark Polarization in $t \overline{t}$ Lepton + Jets Final States written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a study of top quark polarization in $t \overline{t}$ events produced in $p \overline{p}$ collisions at $\sqrt{s}=1.96$ TeV. Data correspond to 9.7 fb$^{-1}$ collected with the D0 detector at the Tevatron. We use final states containing a lepton and at least three jets. The polarization is measured using the distribution of leptons along the beam and helicity axes, and the axis normal to the production plane. This is the first measurement of top quark polarization at the Tevatron in $\ell$+jets final states, and first measurement of transverse polarization in $t \overline{t}$ production. The observed distributions are consistent with the standard model.
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