Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
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
Download 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 full books in PDF, epub, and Kindle. Read online 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 ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
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 2017-08-01 with total page 286 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 Higgs Boson Production in the Diphoton Decay Channel with CMS at the LHC by : Martina Machet
Download or read book Higgs Boson Production in the Diphoton Decay Channel with CMS at the LHC written by Martina Machet and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Response of the High Granularity Calorimeter HGCAL and Characterisation of the Higgs Boson by : Matteo Bonanomi
Download or read book Response of the High Granularity Calorimeter HGCAL and Characterisation of the Higgs Boson written by Matteo Bonanomi and published by Springer Nature. This book was released on 2023-05-23 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the most complete characterization of the Higgs boson properties performed to date in the "golden channel," i.e., decay into a pair of Z bosons which subsequently decay into four leptons. The data collected by the CMS experiment in the so-called Run-II data-taking period of the LHC are used to produce an extensive set of results that test in detail the predictions of the Standard Model. Given the remarkable predictive power of the SM when including the Higgs boson, possible new physics will require even more extensive studies at higher statistics. A massive upgrade of the detectors is necessary to maintain the current physics performance in the harsh environment of the High-Luminosity LHC (HL-LHC) project, expected to start by the end of 2027. The CMS Collaboration will replace the current endcap calorimeters with a High Granularity Calorimeter (HGCAL). The HGCAL will be the very first large-scale silicon-based imaging calorimeter ever employed in a high-energy physics experiment. This book presents the results of the analysis of the test beam data collected with the first large-scale prototype of the HGCAL. The results of this analysis are used to corroborate the final design of the HGCAL and its nominal physics performance expected for the HL-LHC operations.
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 Search for Exotic Higgs Boson Decays to Merged Diphotons by : Michael Andrews
Download or read book Search for Exotic Higgs Boson Decays to Merged Diphotons written by Michael Andrews and published by Springer Nature. This book was released on 2023-03-02 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the first application at CMS of deep learning algorithms trained directly on low-level, “raw” detector data, or so-called end-to-end physics reconstruction. Growing interest in searches for exotic new physics in the CMS collaboration at the Large Hadron Collider at CERN has highlighted the need for a new generation of particle reconstruction algorithms. For many exotic physics searches, sensitivity is constrained not by the ability to extract information from particle-level data but by inefficiencies in the reconstruction of the particle-level quantities themselves. The technique achieves a breakthrough in the reconstruction of highly merged photon pairs that are completely unresolved in the CMS detector. This newfound ability is used to perform the first direct search for exotic Higgs boson decays to a pair of hypothetical light scalar particles H→aa, each subsequently decaying to a pair of highly merged photons a→yy, an analysis once thought impossible to perform. The book concludes with an outlook on potential new exotic searches made accessible by this new reconstruction paradigm.
Book Synopsis Development of a New Tracker for the CMS Upgrade Phase 2 and Study of the HL-LHC Physics Reach by : Martin Delcourt
Download or read book Development of a New Tracker for the CMS Upgrade Phase 2 and Study of the HL-LHC Physics Reach written by Martin Delcourt and published by Presses universitaires de Louvain. This book was released on 2020-11-26 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard model of particle physics provides a coherent description of highenergy physics processes and has been hugely successful in providing experimental predictions. Among its long list of achievements, the most significant is arguably that of the discovery of the Higgs boson half a century after being theorised, providing the last cornerstone needed for the standard model to become fully consistent. Despite huge successes, the standard model still suffers from major shortcomings. On the path leading towards a better understanding of particle physics, an in-depth study of the Higgs boson is key. This relentless work of characterising the properties of the Higgs boson is currently being undertaken at the Large Hadron Collider, where high-energy proton collisions are being recorded by dedicated detectors, providing a continuous improvement to the understanding of the standard model. Amid tremendous achievements, some processes, remain too weak to be detected with the current installations. One such measurement is the combined production of two Higgs bosons allowing for a direct handle on the Higgs self-coupling parameter of the standard model. To maximise the physics reach of the collider, it will be subjected to a major upgrade, allowing for a strong increase in luminosity. Such a dramatic change will bring major challenges to the experiments recording these collisions and upgrades are required if they are to maintain their outstanding performance. This thesis explores the upgrade of the CMS silicon strip detector, centred around the in-beam characterisation of detector module prototypes and discusses the physics reach of the upgraded machine, with an emphasis on Higgs boson pair production in the bbWW(l) final state.
Book Synopsis Study of High-pT Higgs Boson Production in the B ̄b Decay Channel and Calibration of the X → B ̄b Tagger with the ATLAS Detector by : Eleanor Jones
Download or read book Study of High-pT Higgs Boson Production in the B ̄b Decay Channel and Calibration of the X → B ̄b Tagger with the ATLAS Detector written by Eleanor Jones 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 a Standard Model Higgs Boson-like Diphoton Resonance with the CMS Detector by : Mingming Yang (Ph. D.)
Download or read book Observation and Measurement of a Standard Model Higgs Boson-like Diphoton Resonance with the CMS Detector written by Mingming Yang (Ph. D.) and published by . This book was released on 2015 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis concerns the observation of a new particle and the measurements of its properties, from the search of the Higgs boson through its decay into two photons at the CMS experiment at CERN's Large Hadron Collider (LHC), on the full LHC "Run I" data collected by the CMS detector during 2011 and 2012, consisting of proton-proton collision events at [square root of] s = 7 TeV with L = 5.1 fb-1 and at [square root of] s = 8 TeV with L = 19.7 fb-1, with the final calibration. In particular, an excess of events above the background expectation is observed, with a local significance of 5.7 standard deviations at a mass of 124.7 GeV, which constitutes the observation of a new particle through the two photon decay channel. A further measurement provides the precise mass of this new particle as 124.72+0.35 -0.36 GeV = 124.72+0.31 -0.32(stat)+0.16 -0.16(syst) GeV. Its total production cross section times two photon decay branching ratio relative to that of the Standard Model Higgs boson is determined as 1.12+0.26 -0.23 = 1.12+0.21 -0.21(stat)+0.15 -0.09(syst), compatible with the Higgs boson expectation. Further extractions of its properties relative to the Higgs boson, including the production cross section times decay branching ratios for separate Higgs production processes, couplings to bosons and to fermions, and effective couplings to the photon and to the gluon, are all compatible with the expectations for the Standard Model Higgs boson.
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 Beam Test Calorimeter Prototypes for the CMS Calorimeter Endcap Upgrade by : Thorben Quast
Download or read book Beam Test Calorimeter Prototypes for the CMS Calorimeter Endcap Upgrade written by Thorben Quast and published by Springer Nature. This book was released on 2022-01-24 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to cope with the increased radiation level and the challenging pile-up conditions at High Luminosity-LHC, the CMS collaboration will replace its current calorimeter endcaps with the High Granularity Calorimeter (HGCAL) in the mid 2020s. This dissertation addresses two important topics related to the preparation of the HGCAL upgrade: experimental validation of its silicon- based design and fast simulation of its data. Beam tests at the DESY (Hamburg) and the CERN SPS beam test facilities in 2018 have been the basis for the design validation. The associated experimental infrastructure, the algorithms deployed in the reconstruction of the recorded data, as well as the respective analyses are reported in this thesis: First, core components of the silicon-based prototype modules are characterised and it is demonstrated that the assembled modules are functional. In particular, their efficiency to detect minimum ionising particles (MIPs) traversing the silicon sensors is found to be more than 98% for most of the modules. No indication of charge sharing between the silicon pads is observed. Subsequently, the energy response is calibrated in situ using the beam test data. Equalisation of the different responses among the readout channels is achieved with MIPs hereby deploying the HGCAL prototype as a MIP-tracking device. The relative variation of the inferred calibration constants amounts to 3% for channels on the same readout chip. The calibration of the time-of-arrival information is performed with an external time reference detector. With it, timing resolutions of single cells including the full prototype readout chain around 60ps in the asymptotic high energy limit are obtained. The calorimetric performance of the HGCAL prototype is validated with particle showers induced by incident positrons and charged pions. For electromagnetic showers, the constant term in the relative energy resolution is measured to be (0.52± 0.08) %, whereas the stochastic term amounts to (22.2 ± 0.3)% √GeV. This result is in good agreement with the calorimeter simulation with GEANT4. The prototype’s positioning resolution of the shower axis, after subtracting the contribution from the delay wire chambers in the beam line used as reference, is found to be below 0.4 mm at 300 GeV. At the same energy, the angular resolution in the reconstruction of the electromagnetic shower axis in this prototype is measured to be less than 5mrad. The analysis of the hadronic showers in this thesis makes use state-of-the- art machine-learning methods that exploit the calorimeter’s granularity. It is indicated that the energy resolution may be improved using software compensation and also that the separation of electromagnetic and charged pion-induced showers in the calorimeter may benefit from such methods. The measurements of the hadronic showers are adequately reproduced by GEANT4 simulation. Altogether, the obtained results from the analysis of the beam test data in this thesis are in agreement with the full functionality of the silicon-based HGCAL design. The final part of this thesis provides a proof of principle that generative modelling based on deep neural networks in conjunction with the Wasserstein distance is a suitable approach for the fast simulation of HGCAL data: Instead of sequential simulation, a deep neural network-based generative model generates all calorimeter energy depositions simultaneously. This genera t or network is optimised throu gh an adversarial training process using a critic network guided by the Wasserstein distance. The developed framework in this thesis is applied to both GEANT4- simulated electromagnetic showers and to positron data from the beam tests. Ultimately, this fast simulation approach is up to four orders of magnitude faster than sequential simulation with GEANT4. It is able to produce realistic calorimeter energy depositions from electromagnetic showers, incorporating their fluctuations and correlations when converted into typical calorimeter observables.
Book Synopsis Observation of a New State in the Search for the Higgs Boson at CMS by : Giovanni Petrucciani
Download or read book Observation of a New State in the Search for the Higgs Boson at CMS written by Giovanni Petrucciani and published by Springer. This book was released on 2014-12-04 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the searches that lead to the discovery of a Higgs boson performed at CMS, one of the two main experiments at the CERN LHC. After an overview of the theory and of the CMS experiment, all search channels are described, with emphasis on the ones with the best sensitivity. The statistical methodology used to analyse and the outcomes of the searches and the discovery results are then presented in detail.
Book Synopsis Observation of a Higgs Boson and Measurement of Its Mass in the Diphoton Decay Channel with the ATLAS Detector at the LHC by : Narei Lorenzo Martinez
Download or read book Observation of a Higgs Boson and Measurement of Its Mass in the Diphoton Decay Channel with the ATLAS Detector at the LHC written by Narei Lorenzo Martinez and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of the particle physics predicts the existence of a massive scalar boson, usually referred to as Higgs boson in the literature, as resulting from the Spontaneous Symmetry Breaking mechanism, needed to generate the mass of the particles. The Higgs boson whose mass is theoretically undetermined, is experimentally looked for since half a century by various experiments. This is the case of the ATLAS experiment at LHC which started taking data from high energy collisions in 2010. One of the most important decay channel in the LHC environment is the diphoton channel, because the final state can be completely reconstructed with high precision. The photon energy response is a key point in this analysis, as the signal would appear as a narrow resonance over a large background. In this thesis, a detailed study of the photon energy response, using the ATLAS electromagnetic calorimeter has been performed. This study has provided a better understanding of the photon energy resolution and scale, thus enabling an improvement of the sensitivity of the diphoton analysis as well as a precise determination of the systematic uncertainties on the peak position. The diphoton decay channel had a prominent role in the discovery of a new particle compatible with the Standard Model Higgs boson by the ATLAS and CMS experiments, that occurred in July 2012. Using this channel as well as the better understanding of the photon energy response, a measurement of the mass of this particle is proposed in this thesis, with the data collected in 2011 and 2012 at a center-of-mass energy of 7 TeV and 8 TeV. A mass of 126.8 +/- 0.2 (stat) +\- 0.7 (syst) GeV/c2 is found. The calibration of the photon energy measurement with the calorimeter is the source of the largest systematic uncertainty on this measurement. Strategies to reduce this systematic error are discussed.
Book Synopsis Higgs Boson Production with a Top Quark Pair in the Diphoton Channel, Double Higgs Production in the Bb-diphoton Channel, and Inner Tracker Upgrade with the Atlas Detector at the Large Hadron Collider by : Alex Zeng Wang
Download or read book Higgs Boson Production with a Top Quark Pair in the Diphoton Channel, Double Higgs Production in the Bb-diphoton Channel, and Inner Tracker Upgrade with the Atlas Detector at the Large Hadron Collider written by Alex Zeng Wang and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery of the Higgs boson in 2012, the diphoton ([gamma][gamma]) decay channel of the Higgs boson has been one of the most potent channels due to the contrast between the smoothly falling background and sharply peaked signal in the diphoton invariant mass. In 2018, with up to 80 fb-1 of data at [square root]s = 13 TeV, ATLAS observed Higgs boson production in association with a pair of top quarks (ttH) with a significance of 5.8 [sigma] by combining measurements in the [gamma][gamma], bb, ZZ, and multi-lepton Higgs decay channels. The ttH production cross-section was measured to be 670 [plus or minus] 90 (stat) +110 -100 (syst) fb. The diphoton channel was one of the main contributors to this result, alone providing a significance of 4.1 [sigma]. With 140 fb-1, a search for non-resonant Higgs pair production in the bb[gamma][gamma] final state was performed. No significant signal was observed and upper limits at 95% confidence level were set. The observed limit on the SM cross-section was 130 fb, or 4.2 times the predicted value. The observed Higgs trilinear coupling modifier was constrained to be between [-1.5, 6.7]. Both the ttH (H [rightwards arrow] [gamma][gamma]) and HH bb[gamma][gamma] analyses will benefit tremendously from the increased statistics expected from the High-Luminosity LHC (HL-LHC). To ensure the continued efficiency of the detector in the harsh HL-LHC environment, ATLAS will install a new Inner Tracker (ITk) consisting of silicon pixel sensors in its innermost layer. At SLAC National Accelerator Laboratory, a variety of electrical tests are performed for the construction of a prototype integrated pixel system, in order to provide early feedback and validation of the ITk design.
Book Synopsis Measurement of Higgs Boson Production in the Diphoton Decay Channel in [math Display by :
Download or read book Measurement of Higgs Boson Production in the Diphoton Decay Channel in [math Display written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diphoton Lineshape of the BEH Boson Using the ATLAS Detector at the LHC by : Cyril Bécot
Download or read book Diphoton Lineshape of the BEH Boson Using the ATLAS Detector at the LHC written by Cyril Bécot and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the data collected during the first mn of the LHC by the ATLAS and CMS collaborations allowed for the discovery of the BEH boson, a huge effort has been done toward the detailed studies of its properties. This thesis is particularly oriented toward the understanding of the Higgs boson lineshape in its diphoton decay channel, using the data collected by the ATLAS detector in 2011 and 2012. The electromagnetic calibration of the ATLAS detector is described in details, and the precise measurement of the BEH boson mass it allowed for, at m_H = 125.36 +1- 0.42 GeV, is summarized. A first upper limit on the BEH boson decay width is presented in detail, and gave a limit at Gamma_H 5.3 GeV at 95% C.L.). The last part of this thesis presents a study of quantum interferences between signal and background processes in the gg -- gammagamma channel, which are expected to distord the di-photon lineshape and create a mass shift.
Book Synopsis Study of Higgs Boson Production Through Its Decay to Two Photons Using Data Collected at a Centre-of-mass Energy of 13 TeV with the CMS Detector by : Louie Corpe
Download or read book Study of Higgs Boson Production Through Its Decay to Two Photons Using Data Collected at a Centre-of-mass Energy of 13 TeV with the CMS Detector written by Louie Corpe and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurements of the Higgs Boson Inclusive and Differential Fiducial Cross-sections in the Diphoton Decay Channel with Pp Collisions at [square Root]s PDF Online Free](https://books.google.com/books/content/images/frontcover/ApfazwEACAAJ?fife=w200-h370)
