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Search For The Standard Model Higgs Boson And Test Of Cp Invariance In Vector Boson Fusion Production Of The Higgs Boson In The Fully Leptonic H Tautau Ll4nu Final State In Proton Proton Collisions With The Atlas Detector At The Lhc
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Book Synopsis Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-Boson Fusion Production of the Higgs Boson in the Fully Leptonic H->tautau->ll4nu Final State in Proton-Proton Collisions with the ATLAS Detector at the LHC by : Christian Schillo
Download or read book Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-Boson Fusion Production of the Higgs Boson in the Fully Leptonic H->tautau->ll4nu Final State in Proton-Proton Collisions with the ATLAS Detector at the LHC written by Christian Schillo and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson in the Fully Leptonic H->t+t--> L+l-4v Final State in Proton-proton Collisions with the ATLAS Detector at the LHC by : Christian Schillo
Download or read book Search for the Standard Model Higgs Boson and Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson in the Fully Leptonic H->t+t--> L+l-4v Final State in Proton-proton Collisions with the ATLAS Detector at the LHC written by Christian Schillo and published by . This book was released on 2016 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 Search for the Standard Model Higgs Boson in the H → ZZ → l + l - qq Decay Channel at CMS by : Francesco Pandolfi
Download or read book Search for the Standard Model Higgs Boson in the H → ZZ → l + l - qq Decay Channel at CMS written by Francesco Pandolfi and published by Springer Science & Business Media. This book was released on 2013-08-15 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical foundations of the Standard Model of elementary particles relies on the existence of the Higgs boson, a particle which has been revealed for the first time by the experiments run at the Large Hadron Collider (LHC) in 2012. As the Higgs boson is an unstable particle, its search strategies were based on its decay products. In this thesis, Francesco Pandolfi conducted a search for the Higgs boson in the H → ZZ → l + l - qq Decay Channel with 4.6 fb -1 of 7 TeV proton-proton collision data collected by the Compact Muon Solenoid (CMS) experiment. The presence of jets in the final state poses a series of challenges to the experimenter: both from a technical point of view, as jets are complex objects and necessitate of ad-hoc reconstruction techniques, and from an analytical one, as backgrounds with jets are copious at hadron colliders, therefore analyses must obtain high degrees of background rejection in order to achieve competitive sensitivity. This is accomplished by following two directives: the use of an angular likelihood discriminant, capable of discriminating events likely to originate from the decay of a scalar boson from non-resonant backgrounds, and by using jet parton flavor tagging, selecting jets compatible with quark hadronization and discarding jets more likely to be initiated by gluons. The events passing the selection requirements in 4.6 fb -1 of data collected by the CMS detector are examined, in the search of a possible signal compatible with the decay of a heavy Higgs boson. The thesis describes the statistical tools and the results of this analysis. This work is a paradigm for studies of the Higgs boson with final states with jets. The non-expert physicists will enjoy a complete and eminently readable description of a proton-proton collider analysis. At the same time, the expert reader will learn the details of the searches done with jets at CMS.
Book Synopsis A Beauty-ful Boson by : Giulia Di Gregorio
Download or read book A Beauty-ful Boson written by Giulia Di Gregorio and published by Springer Nature. This book was released on 2023-01-01 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Book Synopsis Test of CP-invariance in Vector Boson Fusion Production of the Higgs Boson Using the Optimal Observable Method in the Di-tau Decay Channel with the ATLAS Detector by : Martin Spangenberg (Researcher in particle physics)
Download or read book Test of CP-invariance in Vector Boson Fusion Production of the Higgs Boson Using the Optimal Observable Method in the Di-tau Decay Channel with the ATLAS Detector written by Martin Spangenberg (Researcher in particle physics) and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Standard Model Higgs Boson by : M.B. Einhorn
Download or read book The Standard Model Higgs Boson written by M.B. Einhorn and published by Elsevier. This book was released on 2012-12-02 with total page 401 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of electroweak and strong interactions contains a scalar field which permeates all of space and matter, and whose properties provide the explanation of the origin of the masses. Commonly referred to as the Higgs field, it assumes in the physical vacuum a non-vanishing classical expectation value to which the masses of not only the vector bosons, but all the other known fundamental particles (quarks and leptons) are proportional. This volume presents a concise summary of the phenomenological properties of the Higgs boson.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with a Vector Boson and Decaying Into a Tau Pair in Pp Collisions at S by :
Download or read book Search for the Standard Model Higgs Boson Produced in Association with a Vector Boson and Decaying Into a Tau Pair in Pp 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 for the standard model Higgs boson produced in association with a vector boson with the decay H → ?? is presented. The data correspond to 20.3 fb-1 of integrated luminosity from proton-proton collisions at √s=8 TeV recorded by the ATLAS experiment at the LHC during 2012. The data agree with the background expectation, and 95% confidence-level upper limits are placed on the cross section of this process. The observed (expected) limit, expressed in terms of the signal strength ? = ?/?SM for mH = 125 GeV, is ?
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 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 the Standard Model Higgs Boson Produced Through Vector Boson Fusion and Decaying to $\mathrm{b\bar{b}}$. by :
Download or read book Search for the Standard Model Higgs Boson Produced Through Vector Boson Fusion and Decaying to $\mathrm{b\bar{b}}$. written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A first search is reported for a standard model Higgs boson (H) that is produced through vector boson fusion and decays to a bottom-quark pair. Two data samples, corresponding to integrated luminosities of 19.8 fb-1 and 18.3 fb-1 of proton-proton collisions at √s=8 TeV were selected for this channel at the CERN LHC. The observed significance in these data samples for a H→$mathrm{bar{b}}$ signal at a mass of 125 GeV is 2.2 standard deviations, while the expected significance is 0.8 standard deviations. The fitted signal strength ?=?/?SM=2.8+1.6-1.4. The combination of this result with other CMS searches for the Higgs boson decaying to a b-quark pair yields a signal strength of 1.0±0.4, corresponding to a signal significance of 2.6 standard deviations for a Higgs boson mass of 125 GeV.
Book Synopsis Discovery of the Higgs Boson, Measurements of Higgs Boson Properties, and Search for High Mass Beyond the Standard Model Scalar Particle in the Diphoton Final State with the ATLAS Detector at the Large Hadron Collider by : Hongtao Yang
Download or read book Discovery of the Higgs Boson, Measurements of Higgs Boson Properties, and Search for High Mass Beyond the Standard Model Scalar Particle in the Diphoton Final State with the ATLAS Detector at the Large Hadron Collider written by Hongtao Yang and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With 4.8~$\rm{fb}^{-1}$ of proton-proton collision data collected at $\sqrt{s}=7~\rm{TeV}$ in 2011, and 5.9~$\rm{fb}^{-1}$ collected at $\sqrt{s}=8~\rm{TeV}$ in 2012 by the ATLAS detector at the Large Hadron Collider, an excess of 4.5 standard deviations from the background-only hypothesis is observed near 126.5~GeV in the diphoton invariant mass spectra. Along with the excesses observed in the $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ and $H \rightarrow WW^{(*)}\rightarrow \ell\nu\ell\nu$ channels, the observation of a Higgs-like particle is established at 6.0 standard deviations level. With more data accumulated during LHC Run~1, the measurements of Higgs boson couplings and mass in the $H\to\gamma\gamma$ channel are conducted by the ATLAS experiment based on 4.5~$\rm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s}=7~\rm{TeV}$ collected in 2011, and 20.3~$\rm{fb}^{-1}$ at $\sqrt{s}=8~\rm{TeV}$ collected in 2012. The combined signal strength, defined as number of observed Higgs boson decays to diphoton divided by the corresponding Standard Model prediction, is measured to be $1.17 \ ^{+0.28}_{-0.26}$ assuming the Higgs boson mass being 125.4~$\rm{GeV}$. The signal strengths for individual Higgs boson production processes are also measured, and are found to be in good consistency with the Standard Model. The mass of the Higgs boson is measured in $H\to\gamma\gamma$ channel by the ATLAS experiment to be $125.98 \pm 0.50$~\GeV. This measurement is combined with the ones from ATLAS $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$ as well as CMS $H\to\gamma\gamma$ and $H \rightarrow ZZ^{(*)}\rightarrow \ell\ell\ell\ell$. The Higgs boson mass measured from the combination is $125.09\pm0.24~\rm{GeV}$. With LHC center-of-mass energy increased to 13~TeV, a search for high mass Beyond the Standard Model scalar resonance is performed in the diphoton decay channel based on 15.4~$\rm{fb}^{-1}$ of proton-proton collision data collected by the ATLAS detector during 2015 and 2016. While a notable wide excess was first observed in the diphoton invariant mass spectrum from the 2015 data (3.2~$\rm{fb}^{-1}$) with mass near 750~GeV, it is not confirmed by the 2016 data with much higher statistics (12.4~$\rm{fb}^{-1}$). Limits on the production cross section times branching ratio of such resonances are set.
Book Synopsis A Search for Higgs Boson Production Via Vector Boson Fusion in Association with a Photon in the H & Rarr ; B B Channel with the Atlas Detector by : Peyton Wells Rose
Download or read book A Search for Higgs Boson Production Via Vector Boson Fusion in Association with a Photon in the H & Rarr ; B B Channel with the Atlas Detector written by Peyton Wells Rose and published by . This book was released on 2016 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson produced via vector boson fusion in association with a photon and decaying to a bottom quark-antiquark pair has been conducted using 12.6 fb--1 of proton-proton collision data collected by the ATLAS detector at a center-of-mass energy [sqrt] s =13TeV at the LHC in 2015 and 2016. The search benefits from a large reduction of the non-resonant multijet background relative to similar searches that do not explicitly require a photon and from efficient triggering aided by the presence of the photon. Multivariate techniques trained using simulated Monte Carlo samples are used to enhance the sensitivity of the analysis by constructing regions of phase space with higher expected signal fractions relative to the background. Data-driven techniques are used in those regions to provide a reliable estimate of the di-b-jet invariant mass spectrum of the non-resonant background. The final statistical analysis of the data relies on a profile likelihood fit to the di-b-jet invariant mass distribution, searching for a signal bump in an otherwise smoothly falling distribution. There is no observed excess above the background-only expectation, and the observed (expected) 95% confidence level upper limit on the production cross section times branching ratio for a Higgs boson mass of 125 GeV is 4.0 (6.0+2.3--1.7) times the Standard Model expectation. The observed signal strength is --3.9 +2.8--2.7 times the Standard Model value. This analysis is also sensitive to Z + gamma production: the observed (expected) upper limit is 2.0 (1.8+0.7-0.5) times the Standard Model expectation with an observed signal strength of 0.3+/-0.8.
Book Synopsis Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector by : Eric Ouellette
Download or read book Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector written by Eric Ouellette and published by Springer. This book was released on 2015-01-25 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis describes the first measurement of, and constraints on, Higgs boson production in the vector boson fusion mode, where the Higgs decays to b quarks (the most common decay channel), at the LHC. The vector boson fusion mode, in which the Higgs is produced simultaneously with a pair of quark jets, provides an unparalleled opportunity to study the detailed properties of the Higgs, including the possibility of parity and CP violation, as well as its couplings and mass. It thus opens up this new field of study for precision investigation as the LHC increases in energy and intensity, leading the way to this new and exciting arena of precision Higgs research.
Book Synopsis Search for the Standard Model Higgs Boson Decaying to a $W$ Pair in the Fully Leptonic Final State in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for the Standard Model Higgs Boson Decaying to a $W$ Pair in the Fully Leptonic Final State in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson decaying to W+W- in pp collisions at sqrt(s) = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. The W+W- candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess of events above the standard model background expectations is observed, and upper limits on the Higgs boson production relative to the standard model Higgs expectation are derived. The standard model Higgs boson is excluded in the mass range 129-270 GeV at 95% confidence level.
Book Synopsis Discovery and Measurement of a Higgs Boson by :
Download or read book Discovery and Measurement of a Higgs Boson written by and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson in proton-proton collisions with the ATLAS detector at the LHC is presented, with dataset collected up to June, 2012. Clear evidence for the production of a neutral boson is presented. This observation, which has a significance of 5.9 standard deviations, is compatible with the production and decay of the Standard Model Higgs boson. The measurements for the discovered Higgs boson are also presented, including the mass and coupling strengths. These results are based on the complete proton-proton collision data sample recorded by the ATLAS experiment from 2010 to 2012. Evidence for Higgs boson production through vector-boson fusion is reported. Measurements of production and decay mode specific signal strengths and Higgs boson coupling determinations in various bench- mark models show good agreement with the Standard Model Higgs boson hypothesis.
Book Synopsis Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson Using the Optimal Observable Method in the Ditau Decay Channel with the ATLAS Detector by : Hannah Arnold
Download or read book Test of CP Invariance in Vector-boson Fusion Production of the Higgs Boson Using the Optimal Observable Method in the Ditau Decay Channel with the ATLAS Detector written by Hannah Arnold and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurement of the Higgs Boson Properties Using Its Decay to a Pair of [tau] Leptons in Proton-proton Collisions at √s PDF Online Free](https://books.google.com/books/content/images/frontcover/yqZL0AEACAAJ?fife=w200-h370)
