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Measurement Of The Production Rate Of The Charm Jet Recoiling Against The W Boson Using The D0 Detector At The Fermilab Tevatron Collider
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Book Synopsis Measurement of the Production Rate of the Charm Jet Recoiling Against the W Boson Using the D0 Detector at the Fermilab Tevatron Collider by :
Download or read book Measurement of the Production Rate of the Charm Jet Recoiling Against the W Boson Using the D0 Detector at the Fermilab Tevatron Collider written by and published by . This book was released on 2008 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes a measurement of the rate of associated production of the W boson with the charm jet in the proton and anti-proton collisions at the center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. The measurement has direct sensitivity to the strange quark content inside the proton. A direct measurement of the momentum distribution of the strange quark inside the proton is essential for a reliable calculation of new physics signal as well as the background processes at the collider experiments. The identification of events containing a W boson and a charm jet is based on the leptonic decays of the W boson together with a tagging technique for the charm jet identification based on the semileptonic decay of the charm quark into the muon. The charm jet recoiling against the W boson must have a minimum transverse momentum of 20 GeV and an absolute value of pseudorapidity less than 2.5. This measurement utilizes the data collected by the D0 detector at the Fermilab Collider. The measured rate of the charm jet production in association with the W boson in the inclusive jet production with the W boson is 0.074 ± 0.023, which is in agreement with the theoretical predictions at the leading order in Quantum Chromodynamics.
Book Synopsis Measurement of the Production Rate of the Charm Jet Recoiling Against the W Boson Using the D0 Detector at the Fermilab Tevatron Collider by :
Download or read book Measurement of the Production Rate of the Charm Jet Recoiling Against the W Boson Using the D0 Detector at the Fermilab Tevatron Collider written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes the measurement of the rate of the associated production of the W boson with the charm jet in the proton and anti-proton collisions at the center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. The measurement has direct sensitivity to the strange quark content inside the proton. A direct measurement of the momentum distribution of the strange quark inside the proton is essential for a reliable calculation of new physics signal as well as the background processes at the collider experiments. The identification of events containing a W boson and a charm jet is based on the leptonic decays of the W boson together with a tagging technique for the charm jet identification based on the semileptonic decay of the charm quark into the muon. The charm jet recoiling against the W boson must have a minimum transverse momentum of 20 GeV and an absolute value of pseudo rapidity less than 2.5. This measurement utilizes the data collected by the D0 detector at the Fermilab Collider. The measured rate of the charm jet production in association with the W boson in the inclusive jet production with the W boson is 0.074 +/- 0.023, which is in agreement with the theoretical predictions at the leading order in Quantum Chromodynamics.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A New Measurement of the W Boson Mass at D-Zero by :
Download or read book A New Measurement of the W Boson Mass at D-Zero written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new measurement of the W mass using the W [yields] e[nu] data from the D0 forward detectors at the Fermilab Tevatron p[anti p] Collider. This is the first measurement of the W mass with electron candidates in the range 1.5
Book Synopsis The Black Book of Quantum Chromodynamics by : John Campbell
Download or read book The Black Book of Quantum Chromodynamics written by John Campbell and published by Oxford University Press. This book was released on 2018 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title provides an in-depth introduction to the particle physics of current and future experiments at particle accelerators. The text provides the reader with an overview of practically all aspects of the strong interaction necessary to understand and appreciate modern particle phenomenology at the energy frontier.
Book Synopsis Production of W and Z Bosons at by :
Download or read book Production of W and Z Bosons at written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results from the DO experiment are presented on production properties of the W[sup [plus-minus]] and Z[sup 0] gauge bosons using final states containing electrons and muons. The DO detector has accumulated 16.7 pb[sup [minus]1] of data at the Fermilab [bar p]p Tevatron collider. Based on a subset of this data preliminary measurements of the W[sup [plus-minus]] and Z[sup 0] production cross section and a measurement of [alpha][sub s] at Q[sup 2] = M[sub W][sup 2] derived from the ratio of W + 1jet to W + 0jets is presented.
Book Synopsis W+ Jets Production at the Fermilab Tevatron by :
Download or read book W+ Jets Production at the Fermilab Tevatron written by and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production properties of jets in W events have been measured using (square root)s = 1.8 TeV pp collisions at the Fermilab Tevatron Collider. Experimental results from several CDF and D0 analyses are compared to leading-order and next-to-leading-order QCD predictions.
Book Synopsis Electroweak Measurements from the Tevatron by :
Download or read book Electroweak Measurements from the Tevatron written by and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two detectors at the Fermilab Tevatron, D0 and CDF, have collected large samples of W and Z decays. With these data measurements of the properties of the W boson have been performed. From the ratio of the W and Z production cross sections a measurement of the W boson width of 2.062 " 0.059 GeV has been obtained. The W boson mass has been measured to be 80.34 " 0.15 GeV. Both detectors have observed diboson production and measured the triple gauge boson couplings. No deviations from Standard Model predictions have been observed.
Book Synopsis D0 Results on W Boson Properties by :
Download or read book D0 Results on W Boson Properties written by and published by . This book was released on 1997 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 experiment collected ≈ 15 pb−1 in run 1A (1992- 1993) and ≈89 pb−1 in run 1B (1994-1995) of the Fermilab Tevatron Collider using p{anti p} collisions at √s = 1.8 TeV. Results from analyses of events with W and Z bosons are presented for the run 1B data samples. From W → e[nu], [mu][nu] and Z → ee, [mu][mu] decays, the W and Z production cross sections and the W width are determined. Events with W → [tau][nu] decays are used to determine the ratio of the electroweak gauge coupling constants as a measure of lepton universality. Using W → e[nu] and Z → ee decays, the W boson mass is measured.
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 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Both the D0 and CDF experiments at Fermilab Tevatron collider at[radical]s= 1.8 TeV have accumulated over 50pb[sup -1] of data. Each experiment collected more than 50,000 W[yields] l+v and 5000 Z[yields] 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 Implications of the Tevatron Jet Results on PDF. by :
Download or read book Implications of the Tevatron Jet Results on PDF. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a new measurement of the pseudorapidity and transverse-energy (E{sub T}) dependence of the inclusive jet production cross section in p{bar p} collisions at √s = 1:8 TeV using 95 pb−1 of data collected with the D0 detector at the Fermilab Tevatron. The differential cross section d2?/(dE{sub T}d?) is presented up to {vert_bar}?{vert_bar} = 3, significantly extending previous measurements. The results are in good overall agreement with next-to-leading order predictions from QCD, indicate a preference for certain parton distribution functions, and provide the world's best constraint on the gluon distribution at high parton momentum fraction x.
Book Synopsis Higgs Boson Decays into a Pair of Bottom Quarks by : Cecilia Tosciri
Download or read book Higgs Boson Decays into a Pair of Bottom Quarks written by Cecilia Tosciri and published by Springer Nature. This book was released on 2021-10-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
Book Synopsis W/Z+ Jets and Z P_t Measurements at Tevatron by : Y. S. Chung
Download or read book W/Z+ Jets and Z P_t Measurements at Tevatron written by Y. S. Chung and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of W/Z boson + jets production and Z p{sub T} measurement in the p{bar p} collisions at the Tevatron Collider at {radical}s = 1.96 TeV. The CDF II measures W + jets production based on 320 pb{sup -1} and the D0 Run II measures Z + jets with 950 pb{sup -1} data. The measurement of Z p{sub T} is performed with D0 Run II data corresponding to an integrated luminosity of 960 pb{sup -1}. The measurement of W + jets is compared to the Leading Order Alpgen + Pythia prediction and the Z + jets is compared to Sherpa and Pythia Monte Carlo. The Z p{sub T} measurement is also compared to Resbos + Photos predictions.
Book Synopsis Top Quark Physics at Hadron Colliders by : Arnulf Quadt
Download or read book Top Quark Physics at Hadron Colliders written by Arnulf Quadt and published by Springer Science & Business Media. This book was released on 2007-08-16 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This will be a required acquisition text for academic libraries. More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. This extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as examining in detail the sensitivity of these experiments to new physics. Finally, the author provides an overview of top quark physics at the Large Hadron Collider.
Book Synopsis Study of WZ Production with the D0 Detector by : Ketino Kaadze
Download or read book Study of WZ Production with the D0 Detector written by Ketino Kaadze and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Dissertation I present a detailed study of ppbar->WZ production using fully leptonic decays of W and Z bosons with electrons and muons in the final state. Data used for the study were collected by the D0 detector at the Fermilab proton-antiproton collider with a center-of-mass energy of 1.96 TeV and correspond to 4.1 fb[surepscript]-1 of integrated luminosity. The most precise measurement of the WZ production cross section is obtained and found to be in a good agreement with the standard model prediction. I also present a search for new phenomena in the WZ production by investigating the coupling between W and Z bosons and by searching for new charged particles that can decay into WZ boson pair. No evidence for new physics is found, and the most stringent limits are set on the anomalous WWZ coupling parameters and masses of charged resonances. This result also sets the stringest limit on one of the possible sources of electroweak symmetry breaking, a low-scale Technicolor with a typical heavy techni-pion hypothesis.
Book Synopsis Study of $WZ$ Production with the D0 Detector by :
Download or read book Study of $WZ$ Production with the D0 Detector written by and published by . This book was released on 2010 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Dissertation I present a detailed study of p{bar p} --> WZ production using fully leptonic decays of W and Z bosons with electrons and muons in the final state. Data used for the study were collected by the D0 detector at the Fermilab p{bar p} collider with a center-of-mass energy of (square root)s = 1.96 TeV and correspond to 4.1 fb−1 of integrated luminosity. The most precise measurement of the WZ production cross section is obtained and found to be in a good agreement with the standard model prediction. I also present a search for new phenomena in the WZ production by investigating the coupling between W and Z bosons and by searching for new charged particles that can decay into WZ boson pair. No evidence for new physics is found, and the most stringent limits are set on the anomalous WWZ coupling parameters and masses of charged resonances. This result also sets the stringest limit on one of the possible sources of electroweak symmetry breaking, a low-scale Technicolor with a typical heavy techni-pion hypothesis.
Book Synopsis Connecting Quarks with the Cosmos by : National Research Council
Download or read book Connecting Quarks with the Cosmos written by National Research Council and published by National Academies Press. This book was released on 2003-03-12 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances made by physicists in understanding matter, space, and time and by astronomers in understanding the universe as a whole have closely intertwined the question being asked about the universe at its two extremesâ€"the very large and the very small. This report identifies 11 key questions that have a good chance to be answered in the next decade. It urges that a new research strategy be created that brings to bear the techniques of both astronomy and sub-atomic physics in a cross-disciplinary way to address these questions. The report presents seven recommendations to facilitate the necessary research and development coordination. These recommendations identify key priorities for future scientific projects critical for realizing these scientific opportunities.
