Observation of a Higgs Boson in the H to ZZ to 4L Decay Channel and Using Z to 4L Decays as a Calibration Tool in Studies of the Higgs Boson Properties
Title | Observation of a Higgs Boson in the H to ZZ to 4L Decay Channel and Using Z to 4L Decays as a Calibration Tool in Studies of the Higgs Boson Properties PDF eBook |
Author | Matthew Alexander Snowball |
Publisher | |
Pages | 261 |
Release | 2014 |
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A search for the Higgs boson in the decay channel H to ZZ to 4 leptons is performed using data from proton-proton collisions corresponding to and integrated luminosity of 5.1 inverse femtobarns at a center-of-mass energy of 7 TeV and 19.7 inverse femtobarns at a center-of-mass energy of 8 TeV data. A new boson is observed as a narrow resonance with a local significance of 6.8 standard deviations, a measured mass of 125.6 +/- 0.4(stat.) +/- 0.2 (syst.) GeV, and a total width less than or equal to 3.4 GeV at a 95% confidence level. The production cross section of the new boson times the branching fraction to four leptons is measured to be 0.93 +0.26 -0.23(stat.) +0.13 -0.09(syst.) times that predicted by the standard model. Its spin-parity properties are found to be consistent with the expectations for the Standard Model Higgs boson. In addition, measurements of the Z to 4 lepton mass and width are presented. The mass of Z boson decaying to 4 leptons is found to be 91.16 +/- 0.23 GeV while the width is found to be 2.98 +0.54 -0.50 GeV. Spin-parity properties of the Z boson are shown to be consistent with expectation from the Standard Model.
Studies of the Higgs Boson Using the H → ZZ → 4l Decay Channel with the ATLAS Detector at the LHC.
Title | Studies of the Higgs Boson Using the H → ZZ → 4l Decay Channel with the ATLAS Detector at the LHC. PDF eBook |
Author | Francisca Montserrat Garay |
Publisher | |
Pages | |
Release | 2016 |
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Study of the Higgs Boson Decay H → ZZ(*) → 4l and Inner Detector Performance Studies with the ATLAS Experiment
Title | Study of the Higgs Boson Decay H → ZZ(*) → 4l and Inner Detector Performance Studies with the ATLAS Experiment PDF eBook |
Author | Karoline Elfriede Selbach |
Publisher | |
Pages | |
Release | 2014 |
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Measurement of the Mass of the Higgs Boson in the H→ZZ*→4l Channel at the ATLAS Detector
Title | Measurement of the Mass of the Higgs Boson in the H→ZZ*→4l Channel at the ATLAS Detector PDF eBook |
Author | Thomas Powell |
Publisher | |
Pages | |
Release | 2020 |
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Measurement of the Higgs Boson Tensor Coupling in H → ZZ* → 4l Decays with the ATLAS Detector
Title | Measurement of the Higgs Boson Tensor Coupling in H → ZZ* → 4l Decays with the ATLAS Detector PDF eBook |
Author | Katharina Maria Ecker |
Publisher | |
Pages | 0 |
Release | 2018 |
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Precision Measurement of the Higgs Boson Mass and Search for Dilepton Mass Resonances in H to 4l Decays Using the CMS Detector at the LHC
Title | Precision Measurement of the Higgs Boson Mass and Search for Dilepton Mass Resonances in H to 4l Decays Using the CMS Detector at the LHC PDF eBook |
Author | Jake Rosenzweig |
Publisher | |
Pages | 0 |
Release | 2022 |
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Expectations of the total uncertainty are placed on the Higgs boson mass (mH) in the H to ZZstar to 4l (l = e, mu) decay channel. The value of mH, including statistical and systematic uncertainties, is estimated to be mH = 125.38 +- 0.11 [0.11 (stat.) +- 0.02 (syst.)] GeV. Once the data are unblinded, this measurement is predicted to be the world's most precise measurement of mH to date. The data used in the analysis were produced by proton-proton collisions at the Large Hadron Collider (LHC) with a center-of-mass energy of 13 TeV during Run 2 (2016-2018), corresponding to an integrated luminosity of 137.1 fb-1, and were collected by the Compact Muon Solenoid experiment. Using data sets from the same LHC run period, a search for low-mass dilepton resonances in Higgs boson decays to the 4l final state is also conducted. The Hidden Abelian Higgs Model is used in the search for a beyond the Standard Model dark photon (ZD) particle. Constraints are placed at 95% confidence level on the Higgs-mixing parameter k
The Standard Theory of Particle Physics
Title | The Standard Theory of Particle Physics PDF eBook |
Author | Luciano Maiani |
Publisher | World Scientific Publishing Company |
Pages | 483 |
Release | 2016-08-25 |
Genre | Science |
ISBN | 9814733512 |
The book gives a quite complete and up-to-date picture of the Standard Theory with an historical perspective, with a collection of articles written by some of the protagonists of present particle physics. The theoretical developments are described together with the most up-to-date experimental tests, including the discovery of the Higgs Boson and the measurement of its mass as well as the most precise measurements of the top mass, giving the reader a complete description of our present understanding of particle physics.