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Associated Z Higgs Boson Production In The Leptonic Beauty Final State And The Upgrade Of The Pixel Detector At Cms
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Book Synopsis Associated Z+Higgs Boson Production in the Leptonic+Beauty Final State and the Upgrade of the Pixel Detector at CMS by : Philipp Eller
Download or read book Associated Z+Higgs Boson Production in the Leptonic+Beauty Final State and the Upgrade of the Pixel Detector at CMS written by Philipp Eller and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of the Inclusive Beauty Production at CMS and Construction and Commissioning of the CMS Pixel Barrel Detector by : Lea Caminada
Download or read book Study of the Inclusive Beauty Production at CMS and Construction and Commissioning of the CMS Pixel Barrel Detector written by Lea Caminada and published by Springer Science & Business Media. This book was released on 2012-02-23 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes one of the first measurements at the CERN LHC -- the world's largest and highest-energy particle collider. The CMS collision data is analyzed, and results in the first measurement of the inclusive b cross section using semileptonic decays at a center of mass energy of 7 TeV.
Book Synopsis Position Resolution and Upgrade of the CMS Pixel Detector and Search for the Higgs Boson in the Tau+tau- Final State by : Armin Burgmeier
Download or read book Position Resolution and Upgrade of the CMS Pixel Detector and Search for the Higgs Boson in the Tau+tau- Final State written by Armin Burgmeier and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Higgs Boson Produced in Association with a Z Boson and Decaying to WW* with a Leptonic Final State in Pp Collisions at [square Root] S by : Aaron Liblong
Download or read book Measurement of the Higgs Boson Produced in Association with a Z Boson and Decaying to WW* with a Leptonic Final State in Pp Collisions at [square Root] S written by Aaron Liblong and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of the Higgs boson produced in association with a $Z$ boson, with the Higgs decaying to $WW^\ast$ and the $W$ and $Z$ bosons decaying leptonically -- i.e. the $ZH \rightarrow ZWW^\ast \rightarrow \ell\ell\ell\nu\ell\nu$ process -- is presented, using the combined 2015 and 2016 datasets from the ATLAS experiment, totalling 36.1 fb$^{-1}$ of data from $pp$ collisions at $\sqrt{s}$ = 13 TeV. Control region normalisation and a data-driven technique are employed alongside Monte Carlo estimation to predict the number of signal and background events. A cut-based approach is used to discriminate signal events from background, with cut values optimised to maximise expected significance. A statistical fit of the data, including thorough treatment of sources of systematic uncertainty, is performed, yielding a signal strength of $\mu_{ZH} = 3.0^{+1.9}_{-1.4}$, where the Standard Model prediction is $\mu_{ZH} = 1$.
Book Synopsis Particle Physics Reference Library by : Herwig Schopper
Download or read book Particle Physics Reference Library written by Herwig Schopper and published by Springer Nature. This book was released on 2020 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental perspective. It also covers related topics, such as heavy-ion physics, neutrino physics and searches for new physics beyond the standard model. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Book Synopsis Higgs Boson Decays into a Pair of Bottom Quarks by : Cecilia Tosciri
Download or read book Higgs Boson Decays into a Pair of Bottom Quarks written by Cecilia Tosciri and published by Springer Nature. This book was released on 2021-10-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
Book Synopsis Study of the Differential Higgs Boson Production in the Diphoton Decay Channel with CMS and Characterisation and Calibration of Detector Modules for the Phase1 Upgrade of the Pixel Detector by : Vittorio Raoul Tavolaro
Download or read book Study of the Differential Higgs Boson Production in the Diphoton Decay Channel with CMS and Characterisation and Calibration of Detector Modules for the Phase1 Upgrade of the Pixel Detector written by Vittorio Raoul Tavolaro and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis CMS Pixel Detector Upgrade and Top Quark Pole Mass Determination by : Simon Spannagel
Download or read book CMS Pixel Detector Upgrade and Top Quark Pole Mass Determination written by Simon Spannagel and published by Springer. This book was released on 2017-08-09 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses two different topics, both vital for implementing modern high-energy physics experiments: detector development and data analysis. Providing a concise introduction to both the standard model of particle physics and the basic principles of semiconductor tracking detectors, it presents the first measurement of the top quark pole mass from the differential cross-section of tt+J events in the dileptonic tt decay channel. The first part focuses on the development and characterization of silicon pixel detectors. To account for the expected increase in luminosity of the Large Hadron Collider (LHC), the pixel detector of the compact muon solenoid (CMS) experiment is replaced by an upgraded detector with new front-end electronics. It presents comprehensive test beam studies conducted to verify the design and quantify the performance of the new front-end in terms of tracking efficiency and spatial resolution. Furthermore, it proposes a new cluster interpolation method, which utilizes the third central moment of the cluster charge distribution to improve the position resolution. The second part of the thesis introduces an alternative measurement of the top quark mass from the normalized differential production cross-sections of dileptonic top quark pair events with an additional jet. The energy measurement is 8TeV. Using theoretical predictions at next-to-leading order in perturbative Quantum Chromodynamics (QCD), the top quark pole mass is determined using a template fit method.
Book Synopsis Search for the Production of the Higgs Boson Associated with a Pair of Top Quarks with the Atlas Detector at the LHC by : Chao Wang
Download or read book Search for the Production of the Higgs Boson Associated with a Pair of Top Quarks with the Atlas Detector at the LHC written by Chao Wang and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of the Higgs boson associated with a pair of top quarks is one of the most important Higgs boson production modes yet still not observed. Therefore, its discovery is one of the most challenging searches after the Higgs discovery: not only will it be the first time we can observe this Higgs production mode but also we will be able to measure its Yukawa coupling to the top quark. The measured results can answer the basic question of the Standard Model (SM) and can also search for any hints of new physics beyond the SM prediction. An analysis searching for the production of the Higgs boson associated with a pair of top quarks in three leptons final states is presented in this thesis. It is performed with the data collected by the ATLAS detector in 2015 and 2016 during the so-called « Run 2 » campaign corresponding to an integrated luminosity of 36.1 fb−1 at a center of mass energy of 13 TeV. It uses a boosted decision tree algorithm to discriminate between signal and background. The dominant background of fake leptons is estimated with the data-driven matrix method (Matrix Method). For a 125 GeV Standard Model Higgs boson, an excess of events over the expected background from other SM processes is found with an observed significance of 2.2 standard deviations, compared to an expectation of 1.5 standard deviations. The best fit for the ̄ttH production cross section is 1.5+0⋅8−0⋅7 times the SM expectation, consistent with the SM value of the Yukawa coupling to top quarks.
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 Evidence of Higgs to WW to Two Leptons and Two Neutrinos at CMS by : Jae Hyeok Yoo
Download or read book Evidence of Higgs to WW to Two Leptons and Two Neutrinos at CMS written by Jae Hyeok Yoo and published by . This book was released on 2014 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we report the result on the search for the Standard Model(SM) Higgs boson decaying to a pair of W in the full leptonic final state using data collected by CMS detector at LHC at 7 and 8 TeV. The integrated luminosity is 4.9 /fb−1 and 19.5 /fb−1 at 7 and 8 TeV, respectively. The SM Higgs hypothesis is excluded at CLs=95 % in mH = 128 - 600 GeV. An excess of data is ob- served around mH = 125 GeV which corresponds to significance of 4.0[sigma] on the background-only hypothesis. The measured production rate normalized to the SM prediction is 0.76 ± 0.13(stat.) ± 0.16(syst.). A hypothesis test on the spin-parity nature of the new boson shows that data prefers SM Higgs boson to the graviton- like spin-2 model or spin-0 pseudo-scalar model.
Book Synopsis Development of Pixel Detector for ATLAS Inner Tracker(ITK) Upgrade at HL-LHC and Searching for the Standard Model Higgs Boson Decay Into B-quark Pair with ATLAS Experiment by : Tasneem Saleem
Download or read book Development of Pixel Detector for ATLAS Inner Tracker(ITK) Upgrade at HL-LHC and Searching for the Standard Model Higgs Boson Decay Into B-quark Pair with ATLAS Experiment written by Tasneem Saleem and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: ATLAS is one of the two main experiments at LHC with the purpose of investigating the microscopic properties of matter to address the most fundamental questions of particle physics. After the achievements of the first years of running, the potential reach for new discoveries and precise measurements at LHC is being extended by pushing further the energy and luminosity frontiers through three upgrades of the accelerator culminating in the High Luminosity LHC (HL-LHC). To fully profit from the increased luminosity, two main upgrades of the ATLAS inner detector are planned. The first upgrade was already completed at the beginning of 2015 with the insertion of the IBL, a fourth pixel layer located at just 3.2 cm from the beam line. In the second major upgrade, foreseen for 2024, the full inner detector will be replaced by a completely new inner tracker fully made of silicon devices to cope with the high particle density and the harsh radiation environment at the HL-LHC, which during its operational period will deliver 3000 fb-1, almost ten times the integrated luminosity of the full LHC program. This thesis addresses the study of new n+-in-p active edge pixel detectors by developing two novel doping profile analysis methods to study the radiation damage effects on the pixel detectors performance. These methods are the 3D sims imaging method and the TLM Method. TCAD simulation has been used to simulate the doping profiles, the electrical behavior and the radiation damage. Validating the simulation models with data have been done. Moreover, clean-room characterization, as well as testbeam measurement have been performed to test the different detector designs. In the second part of the thesis, I discuss the observation of the standard model Higgs boson bb decay mode using the data collected by ATLAS during the LHC Run2 at center-of-mass energy 13 TeV and an integrated luminosity 79.8 fb−1 of a proton-proton collision. I contributed specifically to the search of the standard model Higgs boson in VH(bb) production mode. In the VH(bb) analysis we don't have any channel that considers the tau leptons in the final state. I have performed a feasibility study to verify the gain of using the taus in the analysis. In addition, for the VH(bb) analysis I have worked on the multi-jet background estimation in the 1-lepton channel using the dijet-mass analysis method.
Book Synopsis Search Or Heavy Higgs Bosons in the Z+ttbar Final State with the CMS Detector by : Yannik Fischer
Download or read book Search Or Heavy Higgs Bosons in the Z+ttbar Final State with the CMS Detector written by Yannik Fischer and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Higgs Boson Production in Association with B-quarks in Final States with Leptons with Machine Learning Techniques at CMS by : M. Bayat Makou
Download or read book Search for Higgs Boson Production in Association with B-quarks in Final States with Leptons with Machine Learning Techniques at CMS written by M. Bayat Makou and published by . This book was released on 2024 with total page 0 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 Measurements of the Higgs Boson Mass and Width in the Four-lepton Final State and Electron Reconstruction in the CMS Experiment at the LHC by : Mykhailo Dalchenko
Download or read book Measurements of the Higgs Boson Mass and Width in the Four-lepton Final State and Electron Reconstruction in the CMS Experiment at the LHC written by Mykhailo Dalchenko and published by . This book was released on 2014 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exotic Decays of the 125 GeV Higgs Boson at Future $e^+e^-$ Lepton Colliders by :
Download or read book Exotic Decays of the 125 GeV Higgs Boson at Future $e^+e^-$ Lepton Colliders written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Discovery of unexpected properties of the Higgs boson offers an intriguing opportunity of shedding light on some of the most profound puzzles in particle physics. The Beyond Standard Model (BSM) decays of the Higgs boson could reveal new physics in a direct manner. Future electron-positron lepton colliders operating as Higgs factories, including CEPC, FCC-ee and ILC, with the advantages of a clean collider environment and large statistics, could greatly enhance the sensitivity in searching for these BSM decays. In this work, we perform a general study of Higgs exotic decays at future $e^+e^-$ lepton colliders, focusing on the Higgs decays with hadronic final states and/or missing energy, which are very challenging for the High-Luminosity program of the Large Hadron Collider (HL-LHC). We show that with simple selection cuts, $O(10^{-3}\sim10^{-5})$ limits on the Higgs exotic decay branching fractions can be achieved using the leptonic decaying spectator $Z$ boson in the associated production mode $e^+e^-\rightarrow Z H$. We further discuss the interplay between the detector performance and Higgs exotic decay, and other possibilities of exotic decays. Our work is a first step in a comprehensive study of Higgs exotic decays at future lepton colliders, which is a key ingredient of Higgs physics that deserves further investigation.
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