Дисертації з теми "Compact Muon Solenoid Detector"
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Hansen, Maria Forbord. "Multi-jet Higgs boson study at the Compact Muon Solenoid detector." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520266.
Повний текст джерелаWilt, Brian A. "Charged multiplicity measurement for simulated pp events in the Compact Muon Solenoid (CMS) detector." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40922.
Повний текст джерелаIncludes bibliographical references (p. 61-64).
In this thesis, I studied the effectiveness of a method for measuring the charged multiplicity of proton-proton collisions in the Compact Muon Solenoid (CMS) experiment at LHC energies ... This technique involves counting reconstructed hits in the innermost layer of the pixel tracker. By using the relationship between pseudorapidity and deposited charge of the hits, we can distinguish between signal and background. We calculate a transformation function as the division of the average Monte Carlo track distribution by the average reconstructed hit distribution. By applying this transformation to the reconstructed hit distributions on an event-by-event basis, we can collect information about minimum bias events. This method gives us access to low PT particles which cannot be reconstructed in charged multiplicity methods using tracklets. A description of the method is given, followed by preliminary results: reconstructed Neh distributions for ... distribution.
by Brian A. Wilt.
S.B.
Werner, Vanessa Gaultney. "Angular Distribution of Prompt Photons Using the Compact Muon Solenoid Detector at √S =7 TeV." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/727.
Повний текст джерелаPol, Adrian Alan. "Machine Learning Anomaly Detection Applications to Compact Muon Solenoid Data Quality Monitoring." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS083.
Повний текст джерелаThe Data Quality Monitoring of High Energy Physics experiments is a crucial and demanding task to deliver high-quality data used for physics analysis. At the Compact Muon Solenoid experiment operating at the CERN Large Hadron Collider, the current quality assessment paradigm, is based on the scrutiny of a large number of statistical tests. However, the ever increasing detector complexity and the volume of monitoring data call for a growing paradigm shift. Here, Machine Learning techniques promise a breakthrough. This dissertation deals with the problem of automating Data Quality Monitoring scrutiny with Machine Learning Anomaly Detection methods. The high-dimensionality of the data precludes the usage of classic detection methods, pointing to novel ones, based on deep learning. Anomalies caused by detector malfunctioning are difficult to enumerate a priori and rare, limiting the amount of labeled data. This thesis explores the landscape of existing algorithms with particular attention to semi-supervised problems and demonstrates their validity and usefulness on real test cases using the experiment data. As part of this project, the monitoring infrastructure was further optimized and extended, delivering methods with higher sensitivity to various failure modes
Wardrope, David Robert. "Preparations for measurement of electroweak vector boson production cross-sections using the electron decay modes, with the Compact Muon Solenoid detector." Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5517.
Повний текст джерелаDeelen, Nikkie [Verfasser], and W. de [Akademischer Betreuer] Boer. "Characterizing detector modules for the Upgrade of the Silicon Tracker of the Compact Muon Solenoid experiment / Nikkie Deelen ; Betreuer: W. de Boer." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/120141492X/34.
Повний текст джерелаSciacca, Francesco G. P. "Analogue readout and signal processing for micro strip gas chambers of the compact muon solenoid at LHC." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391719.
Повний текст джерелаBell, Alan James. "The design and construction of the beam scintillation counter for CMS." Thesis, University of Canterbury. Physics and Astronomy, 2008. http://hdl.handle.net/10092/1588.
Повний текст джерелаBernardes, César Augusto. "Busca por dimensões extras universais no Detector CMS do LHC : o canal com dois múons de mesma carga." reponame:Repositório Institucional da UFABC, 2012.
Знайти повний текст джерелаZenoni, Florian. "Study of Triple-GEM detectors for the CMS muon spectrometer upgrade at LHC and study of the forward-backward charge asymmetry for the search of extra neutral gauge bosons." Doctoral thesis, Universite Libre de Bruxelles, 2016. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/229354.
Повний текст джерелаThis PhD thesis takes place in the CMS experiment at CERN's Large Hadron Collider (LHC). The LHC allowed the discovery of the Brout-Englert-Higgs boson in 2012, and is designed to run for at least 20 years, with an increasing luminosity that will reach by 2025 a value of 7.5 x 10^34 cm^-2 s^-1, that is a yield five times greater than the one initially intended. As a consequence, the experiments must adapt and upgrade many of their components and particle detectors. One of the foreseen upgrades of the CMS experiment concerns the Triple Gas Electron Multiplier (GEM) detectors, currently in development for the forward muon spectrometer. These detectors will be installed in CMS during the second long LHC shutdown (LS2), in 2018-2019. The aim of this upgrade is to better control the event trigger rate at Level 1 for muon detection, thanks to the high performance of these Triple GEM detectors, in presence of very high particle rates (>1 kHz/cm^2). Moreover, thanks to its excellent spatial resolution (~250 um), the GEM technology can improve the muon track reconstruction and the identification capability of the forward detector.The goal of my research is to estimate the sensitivity of Triple GEMs to the hostile background radiation in CMS, essentially made of neutron and photons generated by the interaction between the particles and CMS detectors. The accurate evaluation of this sensitivity is very important, as an underestimation could have ruinous effects of the Triple GEMs efficiency, once they are installed in CMS. To validate my simulations, I have reproduced experimental results obtained with similar detectors already installed in CMS, such as the Resistive Plate Chambers (RPC).The second part of my work regards the study of the CMS experiment capability to discriminate between different models of new physics predicting the existence of neutral vector bosons called Z'. These models belong to plausible extensions of the Standard Model. In particular, the analysis is focused on simulated samples in which the Z' decays in two muons, and on the impact that the Triple GEM detectors upgrades will bring to these measurements during the high luminosity phase of the LHC, called Phase II. My simulations prove that more than 20% of the simulated events see at least one muon in the CMS pseudo-rapidity (eta) region covered by Triple GEM detectors. Preliminary results show that, in the case of 3 TeV/c^2 models, it will be possible already at the end of Phase I to discriminate a Z'I from a Z'SSM with a significance level alpha > 3 sigma.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Tiras, Emrah. "Characterization of 900 four-anode photomultiplier tubes for use in 2013 hadronic forward calorimeter upgrade." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/3392.
Повний текст джерелаLópez, Mateos David. "Jet quenching in the compact muon solenoid at the LHC." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32901.
Повний текст джерелаIncludes bibliographical references (p. 85-88).
In this thesis we perform analyses on simulated data that allow us to demonstrate the sensitivity of the CMS experiment to certain jet quenching observables. In particular, two theoretical scenarios which mimic RHIC data at low PT and which show either no quenching or BDMPS-based quenching at high PT are formulated. The difference between these two scenarios is analyzed for RAA, RCP at different centralities and jet-specific observables such as jet energy spectra, fragmentation functions and jet profiles. We show how these analyses indicate that the large acceptance of the CMS detector, combined with the high granularity in the energy resolution of the calorimeter will be essential tools in studying the phenomenon of jet quenching. Finally, we propose extensions to this work in preparation to analyzing the data from Pb-Pb runs at the LHC. Disclaimer: The work on this thesis does not model the CMS detector geometry with the accuracy required for official analyses, which are fully representative of the CMS detector capabilities. Such analyses require of the full CMS simulation machinery and are left to the CMS Heavy Ion group as a whole.
by David López Mateos.
S.B.
Goitom, Israel. "Track quality monitoring for the compact muon solenoid silicon strip tracker." Thesis, Brunel University, 2009. http://bura.brunel.ac.uk/handle/2438/3785.
Повний текст джерелаClergeau, Jean-François. "Etude d'un détecteur gazeux à micropistes pour l'expérience Compact Muon Solenoid." Lyon 1, 1997. http://www.theses.fr/1997LYO10139.
Повний текст джерелаMunro, Craig. "Distributed data analysis using the Grid for the compact muon solenoid experiment." Thesis, Brunel University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443535.
Повний текст джерелаBein, Samuel Louis. "Targeting the minimal supersymmetric standard model with the compact muon solenoid experiment." Thesis, The Florida State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10161255.
Повний текст джерелаAn interpretation of CMS searches for evidence of supersymmetry in the context of the minimal supersymmetric Standard Model (MSSM) is given. It is found that supersymmetric particles with color charge are excluded in the mass range below about 400 GeV, but neutral and weakly-charged sparticles remain non-excluded in all mass ranges. Discussion of the non-excluded regions of the model parameter space is given, including details on the strengths and weaknesses of existing searches, and recommendations for future analysis strategies. Advancements in the modeling of events arising from quantum chromodynamics and electroweak boson production, which are major backgrounds in searches for new physics at the LHC, are also presented. These methods have been implemented as components of CMS searches for supersymmetry in proton-proton collisions resulting in purely hadronic events (i.e., events with no identified leptons) at a center of momentum energy of 13 TeV. These searches, interpreted in the context of simplified models, exclude supersymmetric gluons (gluinos) up to masses of 1400 to 1600 GeV, depending on the model considered, and exclude scalar top quarks with masses up to about 800 GeV, assuming a massless lightest supersymmetric particle. A search for non-excluded supersymmetry models is also presented, which uses multivariate discriminants to isolate potential signal candidate events. The search achieves sensitivity to new physics models in background-dominated kinematic regions not typically considered by analyses, and rules out supersymmetry models that survived 7 and 8 TeV searches performed by CMS.
Noy, Matthew. "Development and characterisation of the compact muon solenoid strip tracker front end driver." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416357.
Повний текст джерелаKaganas, Gary H. "Comparing Remote Data Transfer Rates of Compact Muon Solenoid Jobs with Xrootd and Lustre." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1534.
Повний текст джерелаWhyntie, Tom. "Constraining the supersymmetric parameter space with early data from the Compact Muon Solenoid experiment." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9626.
Повний текст джерелаHuckvale, Benedict James. "Studying anomalous WWγ couplings and developing the global calorimeter trigger control system for the CMS experiment". Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.505753.
Повний текст джерелаKaravakis, Edward. "A distributed analysis and monitoring framework for the compact Muon solenoid experiment and a pedestrian simulation." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4409.
Повний текст джерелаPetridis, Torres Konstantinos A. "Reconstruction and selection of Z→ττ→e+τ-jet decays at the compact muon solenoid experiment". Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.508935.
Повний текст джерелаSt, John Jason Michael. "A search for new resonances with the dijet angular ratio using the Compact Muon Solenoid Experiment." Thesis, Boston University, 2012. https://hdl.handle.net/2144/31606.
Повний текст джерелаPLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.
A search for dijet resonances is performed using 2.2 fb-1 of proton-proton collision data at [Special characters omitted.] = 7 TeV recorded by the CMS detector at CERN. The study is based on the dijet angular ratio, the ratio of the number of events with the two leading jets having pseudorapidity difference |Δη| < 1.3 to the number of events with 1.3 < |Δη| < 3.0. Models of new resonances which decay into two jets typically predict dijet angular distributions and hence, values of the dijet angular ratio which differ from standard model processes. We thus use the measurement of the angular ratio as a function of mass to set limits on the cross sections of new spin-1⁄2 quark-gluon resonances. We exclude excited quarks of mass less than 3.2 TeV at 95% confidence level, where a limit of 2.8 TeV is expected.
2031-01-01
Pozzobon, Nicola. "A Level 1 Tracking Trigger for the CMS Experiment at the LHC Phase 2 Luminosity Upgrade." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3422049.
Повний текст джерелаDurante il secondo decennio di operazioni al Large Hadron Collider, a partire dall'anno 2020, è previsto un notevole aumento della luminosità istantanea del collisionatore, di un ordine di grandezza superiore rispetto a quella di progetto. Questa luminosità presenta numeose sfide per gli esperimenti a LHC. Il Tracciatore attualmente impiegato nell'esperimento Compact Muon Solenoid dovrà essere rimpiazzato con un sistema in grado di garantire una tracciatura di qualità eccellente ad alte luminosità e, allo stesso tempo, fornire informazioni utili per l'attuale "Livello 0" del sistema di Trigger a CMS, alla frequenza di collisioni di 40 MHz. Le richieste minime per un Trigger basato sul Tracciatore sono la capacità di confermare la presenza di tracce ad alto pT associate a Trigger di Livello 0 ottenuti con i Calorimetri o i rivelatori di muoni. La capacità di fornire criteri efficaci di isolazione può essere ulteriormente richiesa e in ogni caso migliorerebbe significativamente le prestazioni del Trigger. Il rateo dei dati associati con la generazione nel Tracciatore di informazione di Trigger può essere mantenuto in una larghezza di banda sufficientemente maneggevole richiedendo che i moduli sensitivi siano in grado di ridurre localmente i dati. I principali candidati per una simile riduzione locale del rateo i dati sono caratterizzati dalla capacità di fornire la direzione della traccia nel piano trasverso, oltre alla sua posizione, da cui poter dedurre la quantità di moto della traccia stessa. Questi "pT-modules" trasmetterebbero di conseguenza al Trigger di primo livello degli abbozzi di traccia ("stub") generati da particelle con pT al di sopra di 2 GeV/c. La scelta di una simile soglia permetterebbe la riduzione dei dati di un fattore superiore a 10, consentendo quindi un rateo facilmente tollerabile. I moduli di Trigger possono essere realizzati con due sensori di silicio paralleli leggermente separati, caratterizzati da una risoluzione sulla misura del singolo punto d'impatto tale che gli stub, ottenuti tramite correlazione tra i punti misurati nel modulo, possano fornire un'adeguata misura della direzione della traccia, nonostante il braccio di leva sia dell'ordine del millimetro. Un'ipotetica configurazione per il Tracciatore, composto da "lunghi barili", che prevede un Tracciatore esterno realizzato totalmente con moduli di Trigger, è stata proposta. Essa è particolarmente flessibile negli studi di simulazione per il Trigger realizzato con il Tracciatore giacché consente di combinare tra loro, tramite proiezioni geometriche, le informazioni provenienti da diversi strati del Tracciatore. Pertanto è un campo di prova per confrontare le prestazioni di diverse concezioni e diverse configurazioni. Il Tracciatore proposto permette anche la generazione di oggetti più articolati degli stub per il Trigger, come ad esempio le "tracklet", che consistono in coppie di stub opportunamente associate tra loro, le quali possono a loro volta essere usate come punto di partenza per la costruzione di Tracce di Primo Livello. La scelta di moduli di Trigger realizzati con sensori accoppiati è rafforzata da risultati recenti ottenuti con dei prototipi innovativi di rivelatori a Pixel Monolitici durante dei test sotto fascio riportati in questa tesi. Lo sviluppo di simulazioni per un Trigger con il Tracciatore è anch'esso presentato come un significativo progresso verso la progettazione di un nuovo Tracciatore realistico e capace di fornire informazioni utili per il Trigger. Particolarmente impegnativo è lo sforzo per un Trigger che selezioni i leptoni tau prodotti in numerosi processi rari di interesse per gli esperimenti a LHC. Le prestazioni di un Trigger con il Tracciatore su stati finali contenenti leptoni tau saranno fondamentali a luminosità molto elevate e sono illustrate alla fine di questo documento, come naturale prosecuzione del lavoro descritto.
Price, Timothy James. "Development of dense scintillating hard fluoride glasses for the electromagnetic caorimeter of the proposed compact muon solenoid." Thesis, Brunel University, 1994. http://bura.brunel.ac.uk/handle/2438/5406.
Повний текст джерелаMcLeod, Elaine Mary. "An investigation of lead tungstate crystals for use in the compact muon solenoid at the large hadron collider." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413758.
Повний текст джерелаHays, Jonathan Michael. "Performance of a lead tungstate crystal electromagnetic calorimeter for the compact muon solenoid experiment at the large hadron collider." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325489.
Повний текст джерелаPi, Haifeng. "Reconstruction of missing transverse energy and prospect of searching for Higgs boson produced via vector boson fusion in compact muon solenoid experiment." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013000.
Повний текст джерелаJi, Weifeng. "Search for the decays of stopped exotic long-lived particles produced in P-P collisions at 13 TeV at CMS." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524216345344165.
Повний текст джерелаBrinson, Jessica. "A search for disappearing tracks in proton-proton collisions at sqrt(s) = 8 TeV." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428940893.
Повний текст джерелаScurlock, Bobby Joe. "Compact muon solenoid discovery potential for the minimal supergravity model of supersymmetry in single muon events with jets and large missing transverse energy in proton-proton collisions at center-of-mass energy 14 TEV." [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015695.
Повний текст джерелаTschudi, Yohann. "Reconstruction de muons cosmiques en collision et recherche de gluinos se désintégrant en stop-top dans l’expérience CMS au LHC." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10152/document.
Повний текст джерелаThe CMS experiment (Compact Muon Solenoid), built on the ring of the LHC (Large Hadron Collider), is recording data from proton-proton collisions for 2 years now. The alignment between all layers of the tracker, the sub-detector of CMS allowing the reconstruction and the measurement of the momentum of charged particles, is made by using tracks of particles created during collisions and tracks created by the passage of cosmic muons through this sub-detector. A first part of the presentation will be dedicated to the reconstruction of the tracks of these cosmic muons during collisions. A new method, called regional cosmic reconstruction, was developed and implemented. The 69 % efficiency and the fake rate around 1 % allow to use these tracks for the alignment. The second part, dedicated to the analysis of collision data, will concern the search of particles predicted by a model of extension of the Standard Model, the Supersymmetry, in a particular scenario, the light Stop scenario. In the case of a strong mixing in the third generation of squarks, the stop, supersymmetric partner of the top quark, could be light. In the analysis developped during this thesis, we were interested in the case where the mstop < mtop. In the MSSM with R-parity conservation, the gluino would be created by pair and would decay in a stop squark and a top quark. Stop would decays in a c quark and a neutralino, the lightest supereymmetric particle of the model, stable and interacting weakly. No excess with regards to Standard Model predictions was observed in 40pb-1 of data recorded by CMS in 2010. The limits obtained at 95 % confidence level allow to exclude masses of stop until 175 GeV for masses of gluinos going up to 350 GeV and low differences of masses between stop and neutralino
Descamps, Julien. "Etude et optimisation des performances du calorimètre électromagnétique de l'expérience CMS pour la physique au LHC." Paris 6, 2007. http://www.theses.fr/2007PA066136.
Повний текст джерелаKillewald, Phillip. "Measuring physical properties of the W boson in 7 TeV proton-proton collisions." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281636776.
Повний текст джерелаZhang, Fengwangdong. "Measurement of jet production in association with a Z boson at the LHC and jet energy correction calibration at high level trigger in CMS." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/251804.
Повний текст джерелаCette thèse présente une mesure de la section efficace de production de jets associés à un boson Z dans les collisions proton-proton du Grand Collisionneur de Hadron (LHC) situé au CERN, avec des énergies dans le centre de masse de 8 TeV et 13 TeV, respectivement pour les années 2012 et 2015. Les données utilisées pour cette analyse ont été collectées par le détecteur Compact Muon Solenoid (CMS). Elles constituent des échantillons de luminosités intégrées de 19.6 fb⁻¹ et 2.25 fb⁻¹, respectivement pour 2012 et 2015. Nous mesurons la section efficace différentielle en fonction de la multiplicité de jets, de l’impulsion transverse et de la rapidité des jets, et en fonction de la somme scalaire des impulsions transverses des jets. La corrélation entre les rapidités du boson Z et des jets est aussi mesurée et bénéficie de la large statistique prise en 2012. Toutes les distributions d’observables mesurées sont obtenues après corrections pour les effets détecteurs et les résultats des canaux de désintégration muonique et électronique du boson Z sont combinés. Tenant compte des incertitudes statistiques et systématiques, les mesures sont comparées à différentes prédictions théoriques ayant différents niveaux de précision. Les prédictions sont obtenues de MADGRAPH 5, SHERPA 2 (pour l’analyse à 8 TeV uniquement), MADGRAPH_AMC@NLO, et un modèle fixé au NNLO (pour l’analyse à 13 TeV uniquement). Par ces mesures de précisions, et en particulier celle de la corrélation de rapidités, nous avons acquis une compréhension plus approfondie de la chromodynamique quantique dans son régime perturbatif. Grâce à la plus haute énergie jamais atteinte en laboratoire, et à la grande statistique disponible, nous avons sondé avec précision des endroits de l’espace des phases jusque là inaccessibles.Dans cette thèse, les corrections et la calibration de l’énergie des jets pour le haut niveau de sélection de CMS est également présentée. Durant la période de 2012 à 2015, le LHC a été amélioré, non seulement l’énergie dans le centre de masse a augmenté, mais la luminosité instantanée a aussi été amplifiée. L’écart temporelle entre deux paquets de particules dans les faisceaux du LHC a été réduite. L’une des conséquences est que l’impulsion reconstruite pour les jets produits lors d’un croisement de faisceau à une contribution significative venant des multiples interactions ayant lieux lors du croisement des paquets. Une approche technique dédiée a été développée pour corriger l'impulsion des jets. Les corrections obtenues ont été calibrées aux données prises en 2015 et 2016.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Neveu, Jeremy. "Contraintes expérimentales sur des modèles à champ scalaire léger en cosmologie et physique des particules (expériences SNLS et CMS)." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066233/document.
Повний текст джерелаThe nature of dark energy and dark matter is still unknown today. Light scalar field models have been proposed to explain the late-time accelerated expansion of the Universe and the apparent abundance of non-baryonic matter. In the first part of this thesis, the Galileon theory, a well-posed modified gravity theory preserving the local gravitation thanks to the Vainshtein screening effect, is accurately tested against recent cosmological data. Observational constraints are derived on the model parameters using cosmological distance and growth rate of structure measurements. A good agreement is observed between data and theory predictions. The Galileon theory appears therefore as a promising alternative to the cosmological constant scenario. In the second part, the dark matter question is explored through an extra-dimension theory containing massive and stable scalar fields called Branons. Branon production is searched for in the proton-proton collisions that were collected by the Compact Muon Solenoid experiment in 2012 at the Large Hadron Collider. Events with a single photon and transverse missing energy are selected in this data set and compared to the Standard Model and instrumental background estimates. No signature of new physics is observed, so experimental limits on the Branon model parameters are derived. This thesis concludes with some ideas to reach an unified description of both models in the frame of extra-dimension theories
Tschudi, Yohann. "Reconstruction de muons cosmiques en collision et recherche de gluinos se désintégrant en stop-top dans l'expérience CMS au LHC." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00640000.
Повний текст джерелаMarionneau, Matthieu. "Etude des états finals à deux bosons Z dans le canal leptons-neutrinos dans l'expérience CMS auprès du LHC au CERN." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00653498.
Повний текст джерелаBoaretto, Juliana Fonseca. "Estudo do comportamento de variáveis cinemáticas na produção difrativa de mésons D-+* em colisões próton-próton √s = 7TeV." Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=4702.
Повний текст джерелаApresentamos um estudo preliminar da produção difrativa de mésons utilizando dados obtidos da colisão próton-próton, a energias de centro de massa de 7 TeV, com o experimento CMS-LHC. O trabalho inclui o desenvolvimento do algoritmo de reconstrução dos mésons D* através do canal de decaimento D*->D0 + pion (lento) ->K+pion, a medida da eficiência de detecção e reconstrução, e uma análise do comportamento de variáveis cinemáticas na produção difrativa dessas partículas, particularmente, das lacunas de rapidez. Para isso, foi utilizada uma luminosidade integrada de 3,171pb^(-1) de dados coletados no ano de 2010. As análises com os dados experimentais foram comparadas com os resultados obtidos com geradores de Monte Carlo PYTHIA6, PYTHIA8 e POMPYT.
In this work we present a very preliminary study of the diffractive production of mesons D* from proton-proton collisions, at center of mass energy of 7 TeV, with the CMS-LHC experiment. The decay channel where D*->D0 + pion (slow) ->K+pion was reconstructed and the efficiency was computed. An analysis of the dependence of the kinematical variables,particularly of the pseudo rapidity gap Δη, on the meson production was done. A total luminosity of 3.171pb^(-1) of data collected in the year of 2010 was analyzed, and the reconstructed data were compared to the ones obtained with PYTHIA6, PYTHIA8 and POMPYT generators.
Panwar, Lata. "Searches for Higgs boson pair production in bbbb and bbgammagamma final states at Compact Muon Solenoid detector." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5668.
Повний текст джерелаIorio, Alberto Orso Maria. "Measurement of single top t-channel production cross section through the t → W b → μνb decay in 7 TeV proton-proton collisions with the Compact Muon Solenoid detector at the Large Hadron Collider". Tesi di dottorato, 2011. http://www.fedoa.unina.it/8937/1/Iorio.pdf.
Повний текст джерелаFROSALI, SIMONE. "Measurement of sigma(Z/gamma* + >= n jets) in the electronic channel with the CMS detector." Doctoral thesis, 2012. http://hdl.handle.net/2158/630095.
Повний текст джерелаKopp, Gillian Baron. "Search for SUSY with Delayed Photons at the Compact Muon Solenoid." Thesis, 2018. https://thesis.library.caltech.edu/10924/1/Kopp_Gillian_2018.pdf.
Повний текст джерелаPeña, Herrera Cristián. "Searches for New Physics at the Compact Muon Solenoid Experiment and Precision Timing Calorimetry." Thesis, 2017. https://thesis.library.caltech.edu/10189/7/thesis_cpena.pdf.
Повний текст джерелаIn this thesis, we present several searches for beyond the standard model physics in proton-proton collisions recorded by the Compact Muon Solenoid Experiment at center-of-mass energy of 8 and 13\TeV. We search for particle dark matter in events with two or more jets and missing transverse momentum at $\sqrt{s} = 8$ TeV, in this search we use the razor variables to discriminate signal from background events and thus improve the overall sensitivity of the analysis. We observe agreement between the observation and the background estimation. The interpretation of the results is carried out in the context of an effective field theory that couples the standard model quarks to the dark matter candidate. A search for anomalous production of Higgs bosons using 15.3 $\mathrm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV is also presented; this search selects events with a Higgs boson in association with jets, where the Higgs candidate decays into two photons. We also employ the razor variables ($\mathrm{M_{R}}, \mathrm{R}^{2}$) to discriminate signal from background. We observe an excess of events in one of the search bins with relatively high values of $\mathrm{M_{R}}$ and $\mathrm{R}^{2}$. The interpretation of this analysis is pair production of bottom squarks in the context of supersymmetry, this model is also presented in one of the appendices of this thesis. In the other appendix of this thesis, we present a search for new phenomena in high-mass diphoton events using 12.9 $\mathrm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13$ TeV. This search observed a significant excess (3.4 standard deviations, local) with 2015 data at a diphoton invariant mass of 750 GeV, equivalent to $\approx$ 20\% of the current dataset. By repeating the search with the larger dataset collected in 2016, we found that the aforementioned excess has been greatly disfavored. Additionally, in order to confirm the robustness and correctness of the data analysis techniques used in this search, we have carried out a second -- completely independent -- analysis, which confirms the absence of an excess at a diphoton invariant mass of 750 GeV.
We also present detector research and developments studies of electromagnetic calorimeters equipped with precision timing capabilities. We present several calorimeter prototypes that were tested at the Fermilab Test Beam Facility. These prototypes include LYSO-based calorimeters, tungsten-LYSO "shashlik" sampling calorimeters, micro-channel-plate sampling calorimeters, and silicon-based sampling calorimeters. The results of these studies indicate that time resolutions of the order of $\sim$ 30 ps are readily available when measuring electromagnetic showers. A discussion about the applications of precision timing in high energy physics experiments is also presented, with a particular interest in pileup rejection in the context of the high-luminosity upgrade of the Large Hadron Collider foreseen to start in 2025.
Simon, Michał. "Fault tolerant data acquisition through dynamic load scheduling." Rozprawa doktorska, 2013. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=21532.
Повний текст джерелаSimon, Michał. "Fault tolerant data acquisition through dynamic load scheduling." Rozprawa doktorska, 2013. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=21532.
Повний текст джерела