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Measurements Of Higgs Boson Production By Gluon Gluon Fusion And Vector Boson Fusion Using H Ww Enumunu Decays In Pp Collisions At Square Roots
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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 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 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 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 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 Measurement of Higgs Boson Production Via Gluon Fusion in the H →WW Decay Channel with the CMS Experiment by : Adrián Álvarez Fernández
Download or read book Measurement of Higgs Boson Production Via Gluon Fusion in the H →WW Decay Channel with the CMS Experiment written by Adrián Álvarez Fernández and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports measurements of the Higgs boson production in proton-proton collisions at a centre-of-mass energy of 13 TeV with data collected by the CMS experiment during the Run 2 operation period (2016-2018) of the Large Hadron Collider at CERN. The measurement is performed using a sample of event candidates to originate from the decay of a Higgs boson into a pair of W bosons, which then decay into a charged lepton and a neutrino resulting in a nal state with two charged leptons of dierent avour. The thesis focuses on the study of the Higgs boson production through the gluon fusion process, which is the most favoured one at a centre-of-mass energy of 13 TeV...
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 Search for Higgs Boson Off-shell Production in Proton-proton Collisions at 7 and 8 TeV and Derivation of Constraints on Its Total Decay Width by :
Download or read book Search for Higgs Boson Off-shell Production in Proton-proton Collisions at 7 and 8 TeV and Derivation of Constraints on Its Total Decay Width written by and published by . This book was released on 2016 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a WW pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 inverse femtobarns at a centre-of-mass energy of 7 TeV and 19.4 inverse femtobarns at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the standard model prediction of 2.4 (6.2) is obtained at the 95% CL for the gluon fusion process and of 19.3 (34.4) for the vector boson fusion process. Observed and expected limits on the total width of 26 and 66 MeV are found, respectively, at the 95% confidence level (CL). These limits are combined with the previous result in the ZZ channel leading to observed and expected 95% CL upper limits on the width of 13 and 26 MeV, respectively.
Book Synopsis Measurements of the Higgs Boson Production and Decay Rates and Coupling Strengths Using Pp Collision Data at [square Root] S by : Fangzhou Zhang
Download or read book Measurements of the Higgs Boson Production and Decay Rates and Coupling Strengths Using Pp Collision Data at [square Root] S written by Fangzhou Zhang and published by . This book was released on 2017 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Search for the Associated Production of a Higgs Boson with a Single Top Quark in Proton-proton Collisions at S by :
Download or read book Search for the Associated Production of a Higgs Boson with a Single Top Quark in Proton-proton Collisions at S written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a WW pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 inverse femtobarns at a centre-of-mass energy of 7 TeV and 19.4 inverse femtobarns at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the standard model prediction of 2.4 (6.2) is obtained at the 95% CL for the gluon fusion process and of 19.3 (34.4) for the vector boson fusion process. Observed and expected limits on the total width of 26 and 66 MeV are found, respectively, at the 95% confidence level (CL). These limits are combined with the previous result in the ZZ channel leading to observed and expected 95% CL upper limits on the width of 13 and 26 MeV, respectively.
Book Synopsis Measurement of the Higgs Boson Properties Using Its Decay to a Pair of [tau] Leptons in Proton-proton Collisions at √s by : Doyeong Kim
Download or read book Measurement of the Higgs Boson Properties Using Its Decay to a Pair of [tau] Leptons in Proton-proton Collisions at √s written by Doyeong Kim and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Compact Muon Solenoid (CMS) detector has successfully operated with the Large Hadron Collider (LHC) collisions since 2010, leading to the Higgs boson discovery in 2012 by the CMS and ATLAS collaborations. The analyses of data taken during Run 2 (2016-2018) has already led to many interesting results about the properties of the Higgs boson and for the most part they are compatible in the context of the standard model (SM) so far. These studies are important because the SM appears to be an approximation of a more general theory. Precise studies of the Higgs boson's interactions with the known matter and force particles are essential to reveal the microscopic deviations from the SM prediction. One of such interactions is Yukawa couplings of the Higgs boson and fermions. The H → [tau tau] decay is the most sensitive fermionic decay mode that allows direct probing of this interaction. This thesis presents a study of the Higgs boson properties by observing its decay to a pair of tau leptons and testing evidence of non-SM interactions in the Higgs boson production. The results exploit the data collected by the CMS detector during LHC Run-2, in proton-proton collisions with a center-of-mass energy of 13 TeV. Firstly, the Higgs bosons' properties were explored by two complementary approaches by measuring its cross sections. Thanks to the observation of the H → [tau tau] decay in 2016, we can measure the total cross section with higher precision. Furthermore, in the first analysis, the cross sections of different Higgs productions were scrutinized using fine selections within each Higgs production mode which are mutually exclusive using the Simplified Template Cross Section (STXS) framework, proposed by the LHC Higgs Cross Section Working Group. In the second analysis, the first-ever measurement of the inclusive and differential fiducial cross sections for the Higgs boson production decaying to a pair of tau leptons was presented. In the third analysis, a search for anomalous couplings in the Higgs production vertex, including Charge-Parity (CP) violating couplings, is also performed targeting Higgs boson production via gluon fusion in association with two jets and vector boson fusion. None of these analyses has found any hint of new physics beyond the SM, but stringent limits on anomalous Higgs boson couplings to data were set and cross sections of the Higgs bosons in smaller phase spaces were precisely measured.
Book Synopsis Search for a Charged Higgs Boson Produced in the Vector-boson Fusion Mode with Decay H" 2!W"Z Using Pp Collisions at [arrow]" by :
Download or read book Search for a Charged Higgs Boson Produced in the Vector-boson Fusion Mode with Decay H" 2!W"Z Using Pp Collisions 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:
Book Synopsis Measurement of the Higgs-boson Production Cross-section and Test of CP Invariance in Vector-Boson Fusion Production with H → Τ+τ- Decays in the Fully-leptonic Final State with the ATLAS Detector at the LHC by : Alena Lösle
Download or read book Measurement of the Higgs-boson Production Cross-section and Test of CP Invariance in Vector-Boson Fusion Production with H → Τ+τ- Decays in the Fully-leptonic Final State with the ATLAS Detector at the LHC written by Alena Lösle and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Discovery and Measurement of the Higgs Boson in the WW Decay Channel by : David Hall
Download or read book Discovery and Measurement of the Higgs Boson in the WW Decay Channel written by David Hall and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production, and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis, and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.
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:
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