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Measurements Of Gluon Gluon Fusion And Vector Boson Fusion Higgs Boson Production Cross Sections In The H Ww Enymyny Decay Channel In Pp Collisions At Square Roots
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Book Synopsis Measurements of Gluon–gluon Fusion and Vector-boson Fusion Higgs Boson Production Cross-sections in the H → WW⁎ → E[ny][my][ny] Decay Channel in Pp Collisions at [square Root]s by : Anne Kathrin Becker
Download or read book Measurements of Gluon–gluon Fusion and Vector-boson Fusion Higgs Boson Production Cross-sections in the H → WW⁎ → E[ny][my][ny] Decay Channel in Pp Collisions at [square Root]s written by Anne Kathrin Becker and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of Higgs Boson Production by Gluon−gluon Fusion and Vector-boson Fusion Using H->WW∗->e[nu][mu][nu]) Decays in Pp Collisions at [square Root]s by : ATLAS Collaboration CERN
Download or read book Measurements of Higgs Boson Production by Gluon−gluon Fusion and Vector-boson Fusion Using H->WW∗->e[nu][mu][nu]) Decays in Pp Collisions at [square Root]s written by 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:
Book Synopsis Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s by : Ralf Gugel
Download or read book Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s written by Ralf Gugel and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: On the 4 th of July 2012 the observation of a new neutral particle was announced by the ATLAS [1] and CMS [2] Collaborations. This particle is by now generally considered as the Higgs boson H predicted [3, 4] in the Standard Model of particle physics. Its mass of m H = 125.09 ± 0.24 GeV [5] implies a rich set of final states which allow for experimental studies in regards to this particle and searches for deviations from the properties predicted by the Standard Model. In this thesis a measurement of the gluon-fusion and vector-boson fusion production cross sections times H→WW* branching ratio is presented using final states with one electron and one muon. The measurement is based on proton- proton collisions with an integrated luminosity of 36.1 fb -1 √ recorded with the ATLAS detector at the CERN Large Hadron Collider ( LHC ) at s = 13 TeV in 2015 and 2016. Signal-like events are selected in categories with different jet multiplicities. The results are extracted by means of a binned maximum-likelihood fit. To this end, either distributions in multiple discriminant variables or the response of a multivariate classifier are used depending on the category. The results are found to be well compatible with the Standard Model predictions. This analysis is extrapolated to estimate the future precision of such a measurement at the end of the High-Luminosity LHC programme [6]. This extrapolated analysis is combined with analogously extrapolated analyses targeting other production and decay modes of the Higgs boson. Based on this combination the expected precision is determined for future measurements of couplings between the Higgs boson and other particles. Thereby an estimation is given for the anticipated sensitivity of these analyses to signs of physics beyond the Standard Model. In addition studies are presented to identify sources of electron charge misidentification in the reconstruction algorithms employed in the ATLAS Collaboration.
Book Synopsis Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s by : Ralf Gugel
Download or read book Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s written by Ralf Gugel and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Fiducial Differential Cross Sections of Gluon-fusion Production of Higgs Bosons Decaying to WW* {u2192} E??? with the ATLAS Detector at $ \sqrt{s} by :
Download or read book Measurement of Fiducial Differential Cross Sections of Gluon-fusion Production of Higgs Bosons Decaying to WW* {u2192} E??? with the ATLAS Detector at $ \sqrt{s} written by and published by . This book was released on 2016 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, this paper describes a measurement of fiducial and differential cross sections of gluon-fusion Higgs boson production in the H → WW *→ e??? channel, using 20.3 fb–1 of proton-proton collision data. The data were produced at a centre-of-mass energy of √s = 8 TeV at the CERN Large Hadron Collider and recorded by the ATLAS detector in 2012. Cross sections are measured from the observed H→ W W*→ e??? signal yield in categories distinguished by the number of associated jets. The total cross section is measured in a fiducial region defined by the kinematic properties of the charged leptons and neutrinos. Differential cross sections are reported as a function of the number of jets, the Higgs boson transverse momentum, the dilepton rapidity, and the transverse momentum of the leading jet. The jet-veto efficiency, or fraction of events with no jets above a given transverse momentum threshold, is also reported. All measurements are compared to QCD predictions from Monte Carlo generators and fixed-order calculations, and are in agreement with the Standard Model predictions.
Book Synopsis Measurement of Fiducial Differential Cross Sections of Gluon-fusion Production of Higgs Bosons Decaying to WW* 2!e[nu][mu][nu] with the ATLAS Detector at $ \sqrt{s} by :
Download or read book Measurement of Fiducial Differential Cross Sections of Gluon-fusion Production of Higgs Bosons Decaying to WW* 2!e[nu][mu][nu] with the ATLAS Detector at $ \sqrt{s} written by and published by . This book was released on 2016 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, this paper describes a measurement of fiducial and differential cross sections of gluon-fusion Higgs boson production in the H → WW *→ e[nu][mu][nu] channel, using 20.3 fb-1 of proton-proton collision data. The data were produced at a centre-of-mass energy of √s = 8 TeV at the CERN Large Hadron Collider and recorded by the ATLAS detector in 2012. Cross sections are measured from the observed H→ W W*→ e[nu][mu][nu] signal yield in categories distinguished by the number of associated jets. The total cross section is measured in a fiducial region defined by the kinematic properties of the charged leptons and neutrinos. Differential cross sections are reported as a function of the number of jets, the Higgs boson transverse momentum, the dilepton rapidity, and the transverse momentum of the leading jet. The jet-veto efficiency, or fraction of events with no jets above a given transverse momentum threshold, is also reported. All measurements are compared to QCD predictions from Monte Carlo generators and fixed-order calculations, and are in agreement with the Standard Model predictions.
Book Synopsis Measurement of Higgs-boson Production Cross-sections and Test of CP Invariance in Vector-boson Fusion Production in the H → Τ Lep Τ Had Decay Mode with the ATLAS Detector by : Dirk Sammel
Download or read book Measurement of Higgs-boson Production Cross-sections and Test of CP Invariance in Vector-boson Fusion Production in the H → Τ Lep Τ Had Decay Mode with the ATLAS Detector written by Dirk Sammel and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis presents a measurement of the Higgs-boson production cross-section and a test of CP invariance in vector-boson fusion production in the semileptonic final state of the H->tau tau decay channel. Both analyses use proton-proton collision data corresponding to an integrated luminosity of 36.1 fb^-1 recorded with the ATLAS detector at a center-of-mass energy of 13 TeV. The events are divided into categories that target the specific kinematics of the gluon fusion- and the vector-boson fusion production processes of the Higgs boson. A maximum-likelihood fit in the reconstructed di-tau mass is performed to extract the H->tau tau cross-section. A signal excess with an observed significance of 2.4 standard deviations is found under the background-only hypothesis, whereas the expected significance is 2.6 standard deviations. The resulting H->tau tau cross-section is 3.13 +1.53/-1.33 pb, which is in agreement with the prediction by the Standard Model. In combination with the fully leptonic- and fully hadronic final states of the H->tau tau decay channel, the resulting cross-section is 3.77 +1.06/-0.95 pb, which is again consistent with the prediction by the Standard Model. The obtained observed significance is 4.4 standard deviations with an expected significance of 4.1 standard deviations. Further combination with the result of the search for the H->tau tau decay with data recorded at center-of-mass energies of 7 and 8 TeV yields an observed significance of 6.4 standard deviation with an expected significance of 5.4 standard deviations. To test CP invariance in the coupling between the Higgs boson and the electroweak gauge bosons, the production of the Higgs boson via vector-boson fusion is studied. This production process is separated from other processes by using a machine learning approach in form of Boosted Decision Trees. An Effective Field Theory approach is used to expand the Lagrangian of the Standard Model with additional CP-odd terms, quantified by the parameter dtilde. Maximum-likelihood fits are performed in the CP-odd Optimal Observable to set constraints on dtilde. The observed confidence interval at 68.3% confidence level is [-0.006,0.089], whereas the expected confidence interval is [-0.064,0.065]. The combination with the fully leptonic- and fully hadronic final states of the H->tau tau decay channel yields an observed 68.3% confidence interval of [-0.090,0.035] with an expected confidence interval of [-0.035,0.033]. In the combination, also an expected confidence interval at 95% confidence level of [-0.21,015] is obtained. All the results are in agreement with dtilde=0 as predicted by the Standard Model
Book Synopsis Precision Coupling Measurements of the Higgs Boson Using the H->ZZ*->4l Decay Channel by : Syed Haider Abidi
Download or read book Precision Coupling Measurements of the Higgs Boson Using the H->ZZ*->4l Decay Channel written by Syed Haider Abidi and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The coupling of the Higgs boson to other particles is probed by measuring the production cross sections at the Large Hadron Collider using the ATLAS detector. The present measurement is performed using the H->ZZ*->4l decay channel, with l= electron or muon and with datasets corresponding to various integrated luminosities. The inclusive production cross section is measured to be 1.34 +/- 0.12 pb, which is in good agreement with the predicted value of 1.33 +/- 0.08 pb. The gluon-gluon fusion, the vector boson fusion, the vector boson associated and the top associated production cross sections are measured to be 1.12 +/- 0.12 pb, 110 +/- 40 fb, 75 +61 -49 fb and 27 +26 -17 fb, respectively. The differential production cross sections are also measured using the Simplified Template cross sections framework. All measurements are in good agreement with the Standard Model predictions. These results are used to measure the Higgs boson coupling to fermions and vector bosons using the kappa-framework and to derive constraints on contributions from beyond the Standard Model physics using an effective field theory approach. No significant deviations from the Standard Model are observed.
Book Synopsis Measurements of Higgs Boson Production Cross-sections in the H -> [tau][plus][tau][minus] Decay Channel in Pp Collisions at [square Root]s by : ATLAS Collaboration CERN
Download or read book Measurements of Higgs Boson Production Cross-sections in the H -> [tau][plus][tau][minus] Decay Channel in Pp Collisions at [square Root]s written by 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:
Book Synopsis Observation and Measurement of Higgs Boson Decays to WW* with the ATLAS Detector by :
Download or read book Observation and Measurement of Higgs Boson Decays to WW* with the ATLAS Detector written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the observation of Higgs boson decays to WW* based on an excess over background of 6.1 standard deviations in the dilepton final state, where the Standard Model expectation is 5.8 standard deviations. Evidence for the vector-boson fusion (VBF) production process is obtained with a significance of 3.2 standard deviations. The results are obtained from a data sample corresponding to an integrated luminosity of 25 fb-1 from [arrow]"=7 and 8 TeV pp collisions recorded by the ATLAS detector at the LHC. For a Higgs boson mass of 125.36 GeV, the ratio of the measured value to the expected value of the total production cross section times branching fraction is 1.09+0.16-0.15(stat)+0.17-0.14(syst). The corresponding ratios for the gluon fusion and vector-boson fusion production mechanisms are 1.02 " 0.19(stat)+0.22-0.18(syst) and 1.27+0.44-0.40(stat)+0.30-0.21(syst), respectively. At [arrow]"=8 TeV, the total production cross sections are measured to be [sigma](gg 2!>H 2!WW*)=4.6"0.9(stat)+0.8-0.7(syst) pb and [sigma](VBF H 2!W*)=0.51+0.17-0.15(stat)+0.13-0.08(syst) pb. The fiducial cross section is determined for the gluon-fusion process in exclusive final states with 0 or one associated jet.
Book Synopsis Fiducial and Differential Cross-section Measurements for the Vector-boson-fusion Production of the Higgs Boson in the H→WW*→eνμν Decay Channel at 13 TeV with the ATLAS Detector by : [Study Group] ATLAS Collaboration CERN
Download or read book Fiducial and Differential Cross-section Measurements for the Vector-boson-fusion Production of the Higgs Boson in the H→WW*→eνμν Decay Channel at 13 TeV with the ATLAS Detector written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Precision Measurements of Higgs Boson Production in Decays to W Bosons Using Machine Learning with the ATLAS Experiment by : Benjamin Jäger
Download or read book Precision Measurements of Higgs Boson Production in Decays to W Bosons Using Machine Learning with the ATLAS Experiment written by Benjamin Jäger and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Higgs boson is a unique tool in the search for the fundamental laws of nature, as it is connected to many of the open fundamental questions the Standard Model (SM) of particle physics cannot answer. Precision measurements of the properties of the Higgs boson, including its interactions with other fundamental particles, provide a powerful tool to test the predictions of the SM and possibly find deviations from them. As part of a broad Higgs boson physics program at the Large Hadron Collider (LHC), this thesis presents cross-section measurements of Higgs boson production via gluon fusion (ggF) and vector-boson fusion (VBF) in decays to W bosons. The H -> WW* decay is the second most likely decay of the Higgs boson and, in the VBF production mode, the most sensitive channel to measure the coupling of the Higgs boson to vector bosons at the LHC. The measurement is based on pp collisions at a center-of-mass energy of \sqrt{s} = 13 TeV recorded by the ATLAS experiment at the LHC between 2015 and 2018, corresponding to an integrated luminosity of 139 / fb. The measurements of the inclusive ggF and VBF cross sections times branching fraction result in 12.0 +-1.4 pb and 0.75 +0.19 -0.16 pb, respectively. In addition, Higgs boson production is measured in 11 exclusive kinematic regions. All results are found to be consistent with their corresponding SM predictions. The H -> WW* analysis is also an important input to combined Higgs boson measurements, which provide some of the most precise measurements of Higgs boson interactions to date and are briefly summarized in this work. The measurement of the VBF, H -> WW* process is drastically improved over previous results by the implementation of a binary classifier based on a deep neural network (DNN) that distinguishes the VBF, H -> WW* signal from other physical processes. The development and optimization of the DNN are presented in this thesis. This thesis also presents the measurement of the jet energy resolution, which is essential for many physics analyses performed with the ATLAS experiment, such as the H -> WW* analysis, due to the abundance of jets in pp collisions.
Book Synopsis Measurements of Higgs Boson Production and Couplings in the Four-lepton Channel in $pp$ Collisions at Center-of-mass Energies of 7 and 8 TeV with the ATLAS Detector by :
Download or read book Measurements of Higgs Boson Production and Couplings in the Four-lepton Channel in $pp$ Collisions at Center-of-mass Energies of 7 and 8 TeV with the ATLAS Detector written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evidence for the Production of the Standard Model Higgs Boson Produced Via Vector Boson Fusion in the WW* Channel at the ATLAS Detector by : Koos van Nieuwkoop
Download or read book Evidence for the Production of the Standard Model Higgs Boson Produced Via Vector Boson Fusion in the WW* Channel at the ATLAS Detector written by Koos van Nieuwkoop and published by . This book was released on 2017 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 2012, the ATLAS and CMS experiments at CERN's Large Hadron Collider announced they had each observed a new particle with a mass of about 125 GeV/c^2. Given the available data, the properties of this particle are consistent with the Higgs boson predicted by the Standard Model of particle physics (SM). The Higgs boson, as proposed within the SM, is the simplest manifestation of the Brout-Englert-Higgs mechanism. This discovery was driven by the gluon fusion (ggF) production mode, the dominant Higgs boson production mechanism at the LHC. The SM also predicts that the Higgs boson can be produced by the fusion of two weak vector bosons (VBF). Measuring VBF Higgs boson production is an important test of the SM but it is challenging to measure given its cross section is an order of magnitude smaller than that of ggF. After H->bb, H->WW* is the dominant decay channel for the SM Higgs boson at 125 GeV/c^2 and is therefore a promising channel to measure its properties. In addition, the VBF H->WW* search channel makes it possible to probe the exclusive coupling of the Higgs boson to the weak vector bosons. Precise measurements of these coupling strengths make it possible to constrain new models of physics beyond the SM. Despite its relatively large branching ratio, H->WW*->lnln is a challenging channel to search for the Higgs boson because of the neutrinos in the final state which are not directly detectable by the ATLAS detector. Consequently, it is not possible to fully reconstruct the mass of the WW system. Furthermore, there are several backgrounds that have the same signature in the detector as the signal. Top quark pair production is the largest background in this analysis. A multivariate analysis technique, based on an eight-variable boosted decision tree (BDT), is used to search for VBF H->WW*->lnln in the Run-I data and a subset of the Run-II data. This analysis provides the first evidence for VBF H->WW*->lnln with a significance of 3.2 standard deviations in Run-I and 1.9 standard deviations in Run-II. The measured signal strength relative to the rate predicted by the SM for VBF H->WW*->lnln is 1.3 +/- 0.5 using the Run-I data, and 1.7 +1.1/-0.9 using a fraction of the Run-II data.
Book Synopsis Observation of the Higgs Boson Decaying to WW to Leptons and Neutrinos by : Nikolina Ilic
Download or read book Observation of the Higgs Boson Decaying to WW to Leptons and Neutrinos written by Nikolina Ilic and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the Higgs Boson Inclusive and Differential Fiducial Cross-sections in the Diphoton Decay Channel with Pp Collisions at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book Measurements of the Higgs Boson Inclusive and Differential Fiducial Cross-sections in the Diphoton Decay Channel with Pp Collisions 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 measurement of inclusive and differential fiducial cross-sections for the production of the Higgs boson decaying into two photons is performed using 139 fb−1 of proton-proton collision data recorded at s√ = 13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio, in a fiducial region closely matching the experimental selection, is measured to be 67 ± 6 fb, which is in agreement with the state-of-the-art Standard Model prediction of 64 ± 4 fb. Extrapolating this result to the full phase space and correcting for the branching ratio, the total cross-section for Higgs boson production is estimated to be 58 ± 6 pb. In addition, the cross-sections in four fiducial regions sensitive to various Higgs boson production modes and differential cross-sections as a function of either one or two of several observables are measured. All the measurements are found to be in agreement with the Standard Model predictions. The measured transverse momentum distribution of the Higgs boson is used as an indirect probe of the Yukawa coupling of the Higgs boson to the bottom and charm quarks. In addition, five differential cross-section measurements are used to constrain anomalous Higgs boson couplings to vector bosons in the Standard Model effective field theory framework
Book Synopsis Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the H 2![gamma][gamma] and H 2!ZZ* 2!4l Decay Channels at [arrow]" by :
Download or read book Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the H 2![gamma][gamma] and H 2!ZZ* 2!4l Decay Channels at [arrow]" written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the total and differential cross sections of Higgs boson production are performed using 20.3 fb-1 of pp collisions produced by the Large Hadron Collider at a center-of-mass energy of [arrow]" = 8 TeV and recorded by the ATLAS detector. Cross sections are obtained from measured H 2![gamma][gamma] and H 2!ZZ* 2!4l event yields, which are combined accounting for detector efficiencies, fiducial acceptances, and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be [sigma]pp2! = 33.0 " 5.3 (stat) " 1.6 (syst) pb. The measurements are compared to state-of-the-art predictions.
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