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Measurement Of The Associated Production Of Z Bosons And Jets In Proton Antiproton Collisions At The Tevatron
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Book Synopsis Measurement of the Associated Production of Z Bosons and Jets in Proton-antiproton Collisions at the Tevatron by : Britta Tiller
Download or read book Measurement of the Associated Production of Z Bosons and Jets in Proton-antiproton Collisions at the Tevatron written by Britta Tiller and published by . This book was released on 2009 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Associated Production of Z Bosons and Jets in P-pbar Collisions at the Tevatron by :
Download or read book Measurement of the Associated Production of Z Bosons and Jets in P-pbar Collisions at the Tevatron written by and published by . This book was released on 2009 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Higher order QCD corrections to W and Z boson production do not only manifest themselves in the generation of high transverse momenta of the weak bosons, but these QCD effects become directly visible in the production of jets in association with the weak bosons. Studying these processes is not only interesting from the perspective of testing perturbative QCD, but also to constrain a major background to many Standard Model (SM) of non-SM physics signals, e.g. top pair and single top production, searchers for the Higgs boson, leptoquarks and supersymmetric particles. This thesis describes a measurement of Z/[gamma]* + jets production in p$\bar{p}$ collisions at √s = 1.96 TeV in the decay channel Z/[gamma]* → [mu]+[mu]-. An integrated luminosity of L≈ 1fb-1 collected by the D0 detector at the Tevatron between August 2002 and February 2006 has been used. Differential production cross sections as function of the transverse energy of the first, second and third leading jet are measured. The distributions are corrected for acceptance and migration effects back to hadron level using an iterative unfolding method. Comparison of the measured cross sections to event generators, which include part of the higher order corrections are presented.
Book Synopsis Measurement of the Associated Production of Z Bosons and Jets in Pp̄ Collisions at the Tevatron by : Britta Tiller
Download or read book Measurement of the Associated Production of Z Bosons and Jets in Pp̄ Collisions at the Tevatron written by Britta Tiller and published by . This book was released on 2009 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Z Boson Transverse Momentum Distribution, and ZZ and WZ Production by : Mika Vesterinen
Download or read book Z Boson Transverse Momentum Distribution, and ZZ and WZ Production written by Mika Vesterinen and published by Springer Science & Business Media. This book was released on 2012-06-30 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work develops novel data analysis techniques enabling aspects of the Standard Model of particle physics to be tested with unprecedented precision using data from the DZero experiment at the high energy “Tevatron” proton-antiproton collider at Fermilab, Chicago. Vesterinen's measurements of the transverse momentum of Z bosons using the novel variable φ* have exposed deficiencies in the current state-of-the-art theoretical predictions for vector boson production at hadron colliders. These techniques are now being used in the experiments at CERN’s Large Hadron Collider (LHC) and have stimulated considerable interest in the theoretical particle physics community. Furthermore, Vesterinen's measurements of the cross sections for the production of pairs of vector bosons (WZ and ZZ) are to date the most precise ever made.
Book Synopsis A Measurement of the Production of Jets in Association with a W Boson in Proton-antiproton Collisions at the Tevatron Using Data Collected with the CDF Experiment by :
Download or read book A Measurement of the Production of Jets in Association with a W Boson in Proton-antiproton Collisions at the Tevatron Using Data Collected with the CDF Experiment written by and published by . This book was released on 2006 with total page 544 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 Measurements of the Associated Production of a Z Boson and B Jets in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurements of the Associated Production of a Z Boson and B Jets 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: Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton-proton collisions at $\sqrt{s}$ = 8 TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8 inverse femtobarns. Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons.
Book Synopsis Jets, W's, and Z's at Radical S by :
Download or read book Jets, W's, and Z's at Radical S written by and published by . This book was released on 1989 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jet production and electroweak vector boson production have been observed in proton-antiproton collisions at the Fermilab Tevatron Collider. The inclusive jet cross section has been measured for jets up to transverse energies of 400 GeV, and is compared to QCD predictions. W and Z particle production has been observed and studies of their masses are described. 3 refs., 4 figs.
Book Synopsis Studying Z/?*+Jet Production in Proton-antiproton Collisions at {u221A}s by :
Download or read book Studying Z/?*+Jet Production in Proton-antiproton Collisions at {u221A}s written by and published by . This book was released on 2009 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of jets in association with a Z/?* boson is an example of an important class of processes at hadron colliders, namely vector boson + jet (V + jet) production. Comparisons of measurements of this class of processes with theory predictions constitute an important, fundamental test of the Standard Model of particle physics, and of the theory of QCD in particular. While having a smaller cross section than other V +jet processes, Z/?*(→ e+e-) + jets production, with Z/?* → e+e-/?+?-, has a distinct experimental signature allowing for measurements characterized by low backgrounds and a direct, precise measurement of the properties of the decay products of the Z/?* boson. In this thesis, several new measurements of the properties of jets produced in association with a Z/?* boson in p$ar{p}$ collisions at √s = 1.96 TeV are presented. The cross section for Z/?*(→ e+e-) + N jet production (N ≤ 3) is measured, differential in the transverse momentum of the Nth jet in the event, normalized to the inclusive Z/?* cross section. Also, the cross section for Z/?*(→e+e-) + N jets (N ≥ 1) is measured, differential in the difference in azimuthal angle between the di-electron system and any jet in the event, normalized to unity. The data used in the measurements were collected by the D0 experiment located at the Tevatron Collider of the Fermi National Accelerator Laboratory and correspond to an integrated luminosity of 1.04 fb-1. The measured jet transverse momentum spectra are compared with the predictions of perturbative calculations at the next-to-leading order in the strong coupling constant. Given the low sensitivity of the calculations to model parameters, these comparisons represent a stringent test of perturbative QCD. One of the main goals currently being pursued in particle physics is the discovery of the only particle predicted by the Standard Model which has so far no been detected experimentally, namely the Higgs boson. It is assumed that the ATLAS and CMS experiments located at the Large Hadron Collider (LHC), a proton-proton collider at √s = 14 TeV, will be able to detect the Higgs boson, or rule out its existence, within the next few years. The collisions delivered by the LHC will also be used to perform a long range of searches for other new particles, for instance particles predicted by models based on the principle of supersymmetry. The associated production of vector bosons with jets has relatively large production rates at the LHC and can produce a long list of different final states which can include charged leptons, missing transverse energy, as well as light- and heavy-flavour jets. This makes V + jet production a major source of background events to many searches for new particles. Most techniques used for estimating the expected number of background events to searches rely on passing the stable final-state particles of simulated hadron collisions generated using a so-called event generator code, through a simulation of the experimental detector system. The development of event generators which are capable of reliably predicting the properties of jets produced in association with a core process, e.g. the production of a vector boson, has been the subject of a large amount of research activity during the last ten years. These efforts have led to the appearance of the CKKW and MLM algorithms which are implemented in several event generators, among them SHERPA and ALPGEN + PYTHIA. The large data sample collected by the D0 experiment during Run II offers an excellent opportunity for validating these new event generators against experimental measurements of V + jet production. As argued above, the Z/?*(→ e+e-) + jets process offers the combination of a clean experimental signature and large production rates, making it the process of choice for these studies.
Book Synopsis Measurement of the Associated Z Boson and B-jet Production in Proton-proton Collisions at $sqrts}$ by : Natalie Heracleous
Download or read book Measurement of the Associated Z Boson and B-jet Production in Proton-proton Collisions at $sqrts}$ written by Natalie Heracleous and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Associated Z-boson and B-jet Production in Proton Proton Collisions at √s by :
Download or read book Measurement of the Associated Z-boson and B-jet Production in Proton Proton Collisions at √s written by and published by . This book was released on 2013 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Production Cross Section of Jets in Association with a Z Boson in 8 TeV Proton-proton Collisions with the ATLAS Detector by : Rodger Mantifel
Download or read book Measurement of the Production Cross Section of Jets in Association with a Z Boson in 8 TeV Proton-proton Collisions with the ATLAS Detector written by Rodger Mantifel and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the measurement of the production cross sections of jets in association with a Z boson in proton-proton collisions at √s = 8 TeV with an integrated luminosity of 20.3 fb−1 recorded by the ATLAS experiment at the Large Hadron Collider at CERN. Inclusive and differential Z/[gamma]∗(→ e+e−)+jets cross sections are measured for jets with a transversemomentum pT(jet) > 30 GeV and rapidity |y(jet)| 4.4. Z boson candidates are identified by their decay into electron pairs. In order to stringently probe the modelling of Z/[gamma]∗+jets production by Monte Carlo generators in regions of high-pT phase space typical for Higgs boson decay and searches for new physics, events with high-pT final states are investigated. High-pT final states are defined as events with either pT(Z) 300 GeV or pT(leading jet) > 300 GeV. A set of four observables, sensitive to the topology of the event, are measured for the standard event selection as well as in the regions of high-pT phase space. The results from data are unfolded to particle level and compared to calculations of the matrix element from Monte Carlo generators Alpgen+Pythia and Sherpa interfaced to a parton shower. The results show that Sherpa tends to model Z/[gamma]∗+jets production in high-pT regions of phase space much better than Alpgen+Pythia." --
Book Synopsis Measurement of the Associated Production of a Z Boson with Charm Or Bottom Quark Jets in Proton-proton Collisions at √s by : Albert M. Sirunyan
Download or read book Measurement of the Associated Production of a Z Boson with Charm Or Bottom Quark Jets in Proton-proton Collisions at √s written by Albert M. Sirunyan and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Measurement of the Associated Production of a Z Boson and B-jets, in the Dimuon Channel, in Pp Collisions at √s by : Kristina Anne Looper
Download or read book Measurement of the Associated Production of a Z Boson and B-jets, in the Dimuon Channel, in Pp Collisions at √s written by Kristina Anne Looper and published by . This book was released on 2019 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Jets Production Association with a Z Boson in Pp Collision at 7 and 8 TeV with the CMS Detector by :
Download or read book Study of Jets Production Association with a Z Boson in Pp Collision at 7 and 8 TeV with the CMS Detector written by and published by . This book was released on 2014 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study presents the measurement of the rapidity distributions in events containing a Z boson and a jet in proton-proton collisions at a center-of-mass energy of 7 TeV. The data correspond to an integrated luminosity of approximately 5 fb-11, recorded by the CMS detector at the Large Hadron Collider (LHC). The measured angular distributions are compared with the predictions from next-to-leading order perturbative QCD calculations and two generator programs that combine tree-level matrix element calculations with parton showers. We also present a measurement of jet production rates in association with a Z boson using data recorded at a center-of-mass energy of 8 TeV and with an integrated luminosity of 19.8 fb-1. This measurement provides a stringent test of perturbative QCD calculations, and the result is compared with predictions from theoretical calculations.
Book Synopsis Measurement of Associated Production of Z Bosons with Charm Quark Jets in Ppbar Collisions at Sqrt(s) by :
Download or read book Measurement of Associated Production of Z Bosons with Charm Quark Jets in Ppbar 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:
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