[PDF] Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections - eBooks Review

Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections


Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections
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Cms Pixel Detector Upgrade And Top Quark Pole Mass Determination


Cms Pixel Detector Upgrade And Top Quark Pole Mass Determination
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Author : Simon Spannagel
language : en
Publisher: Springer
Release Date : 2017-08-01

Cms Pixel Detector Upgrade And Top Quark Pole Mass Determination written by Simon Spannagel and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-01 with Science categories.


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.



Beam Test Calorimeter Prototypes For The Cms Calorimeter Endcap Upgrade


Beam Test Calorimeter Prototypes For The Cms Calorimeter Endcap Upgrade
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Author : Thorben Quast
language : en
Publisher: Springer Nature
Release Date : 2022-01-24

Beam Test Calorimeter Prototypes For The Cms Calorimeter Endcap Upgrade written by Thorben Quast and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-01-24 with Science categories.


​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.



Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections


Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections
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Author : Simon Spannagel
language : en
Publisher:
Release Date : 2015

Test Beam Measurements For The Upgrade Of The Cms Pixel Detector And Measurement Of The Top Quark Mass From Differential Cross Sections written by Simon Spannagel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.




Chemical Abstracts


Chemical Abstracts
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Author :
language : en
Publisher:
Release Date :

Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Chemistry categories.




Annual Report Of The European Organization For Nuclear Research


Annual Report Of The European Organization For Nuclear Research
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Author : European Organization for Nuclear Research
language : en
Publisher:
Release Date : 1994

Annual Report Of The European Organization For Nuclear Research written by European Organization for Nuclear Research and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Nuclear physics categories.




Government Reports Announcements Index


Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1996

Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.




Deutsche Nationalbibliographie Und Bibliographie Der Im Ausland Erschienenen Deutschsprachigen Ver Ffentlichungen


Deutsche Nationalbibliographie Und Bibliographie Der Im Ausland Erschienenen Deutschsprachigen Ver Ffentlichungen
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Author :
language : de
Publisher:
Release Date : 2009

Deutsche Nationalbibliographie Und Bibliographie Der Im Ausland Erschienenen Deutschsprachigen Ver Ffentlichungen written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Dissertations, Academic categories.




Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards


Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards
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Author :
language : en
Publisher:
Release Date : 2008

Index To Theses With Abstracts Accepted For Higher Degrees By The Universities Of Great Britain And Ireland And The Council For National Academic Awards written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic categories.


Theses on any subject submitted by the academic libraries in the UK and Ireland.



Measurement Of Boosted Differential Top Quark Pair Production Cross Section At 13 Tev With The Cms Detector


Measurement Of Boosted Differential Top Quark Pair Production Cross Section At 13 Tev With The Cms Detector
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Author : Susan J. Dittmer
language : en
Publisher:
Release Date : 2017

Measurement Of Boosted Differential Top Quark Pair Production Cross Section At 13 Tev With The Cms Detector written by Susan J. Dittmer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.


This thesis describes a measurement of the differential top quark pair production cross section for top quarks with high transverse momentum (pt) in proton-proton collisions at a center-of-mass energy of 13 TeV. The measurement is performed using data collected by the CMS experiment during the 2016 data-taking period, corresponding to an integrated luminosity of 35.9 fb-1. The measurement is performed using events where one top quark decays hadronically and is reconstructed as a single large-radius t jet with pt > 400 GeV, while the other top quark decays leptonically to a b jet, an electron or a muon, and a neutrino. Jet substructure techniques are used to identify the large-radius jet as a t jet candidate. The measurement demonstrates that current simulations overpredict the rate of top quark pair production at high pt, providing valuable feedback on the accuracy of current simulation.



Differential Measurements Of The Single Top Quark Cross Section In The T Channel With The Cms Experiment At Sqrt S


Differential Measurements Of The Single Top Quark Cross Section In The T Channel With The Cms Experiment At Sqrt S
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Author : Steffen Röcker
language : en
Publisher:
Release Date : 2015

Differential Measurements Of The Single Top Quark Cross Section In The T Channel With The Cms Experiment At Sqrt S written by Steffen Röcker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.