WorldCat Identities

Roos, Lydia

Overview
Works: 11 works in 15 publications in 2 languages and 93 library holdings
Roles: Thesis advisor, Other, Opponent, Author
Classifications: QC787.P73, 539.709
Publication Timeline
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Most widely held works by Lydia Roos
L'aventure du grand collisionneur LHC du big bang au boson de Higgs by Daniel Denegri( Book )

3 editions published between 2012 and 2014 in French and held by 80 WorldCat member libraries worldwide

Que sont la physique des particules élémentaires, le LHC, et le boson de Higgs ? Ce livre présente le monde des quarks, des leptons et de leurs interactions, régies par des symétries fondamentales de la nature, ainsi que le lien entre ce monde de l'infiniment petit et celui de l'infiniment grand. Cette rencontre entre la physique des particules élémentaires et l'évolution de la matière dans les premiers instants de l'Univers qui ont suivi le big bang est l'un des plus beaux acquis de la science de ces cinquante dernières années. L'ouvrage s'ouvre sur une description du cadre théorique, le modèle standard, élaboré à partir des années 1960, dont il présente à la fois les grands succès expérimentaux, mais également les faiblesses et les insuffisances. Il décrit ensuite la passionnante histoire du grand collisionneur de hadrons du CERN, le LHC, le plus grand projet purement scientifique jamais réalisé.
Etude de la violation de CP dans la désintégration des mésons B en deux corps sans charme dans l'état final auprès du détecteur BaBar à SLAC by Muriel Pivk( Book )

2 editions published in 2003 in French and held by 3 WorldCat member libraries worldwide

Mise en évidence et mesure de la durée de vie du méson Bs avec le détecteur ALEPH au LEP by Lydia Roos( Book )

2 editions published in 1993 in French and held by 2 WorldCat member libraries worldwide

LE TRAVAIL PRESENTE DANS CETTE THESE EST UNE ETUDE DU MESON B#S A L'AIDE DU DETECTEUR ALEPH DU LEP. LES EVENEMENTS SONT SELECTIONNES DANS LE CANAL SEMI-LEPTONIQUE EN UTILISANT LA CORRELATION DE CHARGE ENTRE LE D#S ET LE LEPTON QUI RESULTENT DE LA DESINTEGRATION. NOUS AVONS AINSI ISOLE UN ECHANTILLON D'UNE TRENTAINE DE MESONS B#S PARMI LES DONNEES DE 1900, 1991 ET 1992. AFIN DE MESURER LA VIE MOYENNE DE CET ECHANTILLON, ON RECONSTRUIT, EN TROIS DIMENSIONS, LES VERTEX DU D#S PUIS DU B#S A L'AIDE DES TRACES CHARGEES RESULTANT DE LEURS DESINTEGRATIONS. L'IMPULSION DU B#S EST EVALUEE NON SEULEMENT A PARTIR DE L'IMPULSION DES TRACES CHARGEES (D#S ET LEPTON), MAIS EGALEMENT GRACE A LA MESURE DE L'ENERGIE MANQUANTE DUE A L'EMISSION D'UN NEUTRINO. L'AJUSTEMENT DE LA DISTRIBUTION DE TEMPS PROPRES AINSI OBTENUE FOURNIT LA DUREE DE VIE DU MESON B#S: B#S=2,19+/0,52 (STAT)+/0,1 (SYST) PS
Exploration du canal diphoton au LHC : recherche de nouvelles particules et mesure de la masse du boson de Higgs avec le détecteur ATLAS by Kirill Grevtsov( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

New high-mass states decaying into two photons are predicted in many extensions of the Standard Model (SM). The diphoton final state provides a clean experimental signature with excellent invariant mass resolution and well-known smooth backgrounds.This document presents a search for new particles with diphoton final state at the Large Hadron Collider with the ATLAS detector. The pp collision data used were collected during 2015 and 2016 runs with a center-of-mass energy of 13 TeV. The total corresponding luminosity is ~37 fb-1.In this thesis, I show my contribution to the search of scalar particle. The studies of signal modeling for different mass and width hypothesis will be described in details. The estimation of selection efficiencies and statistical interpretations of results are performed.The data are consistent with the Standard Model background-only hypothesis. Limits on the production cross section times branching ratio to two photons of such resonances as a function of the resonance mass and width are presented.The Liquid Argon electromagnetic calorimeter plays a crucial role in the diphoton analysis. The excellent energy resolution allows to reconstruct objects with high precision. The contribution to operation of LAr calorimeter and its online software will be discussed.The calibration of the electron and photon energy measurements with the electromagnetic calorimeter is performed. The systematic uncertainties related to energy response are one of the largest contribution limiting the precision measurements of the Standard Model Higgs boson mass. The approach to improve the energy response taking into account lateral shower shape development is applied in the calibration procedure
Étude des gerbes hadroniques dans un calorimètre à grande granularité et étude du canal e+e- → HZ (Z → qq) dans les futurs collisionneurs leptoniques by Guillaume Garillot( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

The future International Linear Collider ILC is a project of a leptonic collider which aims to continue the physical program of the LHC. Using this collider, it will be possible to precisely measure the properties of the Higgs Boson, discovered in 2012 at the LHC. Two particle detectors are planned to equip the colliding point of the ILC, the International Large Detector ILD, and the Silicon Detector SiD. These two detectors are designed with the prospect of using particle flow algorithms. This innovative technique can improve the reconstruction and energy measurement of the jets. To apply these particle flow algorithms, highly granular calorimeters have to be used. The semi-digital hadronic calorimeter SDHCAL is proposed to equip the International Large Detector. This calorimeter uses Glass Resistive Plate Chambers as the active part. The readout is done using 1cm x 1cm channels. A prototype has been developed in 2011, mainly at the Institut de Physique Nucléaire de Lyon, and regularly exposed to muons, electrons and hadrons beams at CERN. During this thesis, I mainly worked on the SDHCAL simulation program. Using the data taken in October 2015, I could improve the algorithm which simulates the response of the Glass Resistive Plate Chambers used in the prototype. A comparison of the topology of the electromagnetic and hadronic showers from data and simulation will be presented. Another part of this thesis is focused on the energy reconstruction of the hadronic showers in the SDHCAL. By using the SDHCAL simulation, I could study the impact of the electromagnetic component on the energy estimation of the hadronic showers, from which I could propose an alternative method for reconstructing the energy, which improves the performance of the SDHCAL. I could also study the impact of using a more advanced readout electronics on the energy estimation
Scalar potentials and weak gravity by Gaëtan Lafforgue-Marmet( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

Cette thèse contient trois volets. Le premier concerne la conjecture que la faiblesse des interactions gravitationnelles entre les particules élémentaires, quand elles sont comparées aux interactions électromagnétiques n'est pas fortuite mais une exigence pour toute théorie où la gravité peut être quantifiée. Nous avons montré comment cette « Weak Gravity Conjecture » implique une limite inférieure à la valeur de mélange cinématique de deux champs de jauge abéliens quand il est présent, et nous avons souligné la possibilité d'une nouvelle physique observable aux futurs collisionneurs. Enfin, nous avons étudié les possibilités de formuler une conjecture similaire qui compare cette fois les interactions gravitationnelles à celles dues à l'échange de champs scalaires. Le second volet consiste en un exemple de production d'ondes gravitationnelles par un gaz hors équilibre lors de la période dite de réchauffement de l'Univers. En particulier, si un tel signal était détecté, nous avons montré qu'il était possible en principe de distinguer le spin des particules formant ce gaz, avec la possibilité de détection indirecte de gravitinos. Finalement, le troisième volet présente un modèle particulier comprenant deux doublets de Higgs dont le second est invisible dans les expériences actuelles. Cette suppression est due à une symétrie qui supprime ses couplages aux états du Modèle Standard
Phenomenology and collider constraints of Supersymmetric models in the Run 2 era of the LHC by Sophie Williamson( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

It has long been thought that the Standard Model (SM) is an incomplete description of our universe, yet experimental results thus far do not confirm anything beyond it. Minimal supersymmetry, embodied by the minimal supersymmetric standard model (MSSM), is a competitive extension of the SM and has been well investigated, especially in the context of simplified models, at colliders. However, current search techniques may not be making optimal use of the collider's ability to test the accessible parameter space. Instead of using a static veto on jet momentum to minimise undesirable background processes in signal searches, it can be shown that employing a dynamic jet veto constructed out of several measures of hadronic and leptonic activity can heighten the discovery potential of simplified MSSM scans. At the same time, it cannot be denied that the limits placed on simplified models are not a true representation of more complex scenarios - especially non-minimal supersymmetry models where decay signatures are altered by a more complex chargino and neutralino spectrum. Dirac gauginos (DG) are a well-motivated non-minimal extension that restore the naturalness being lost by the ever more stringent constraints on the MSSM. Here this work looks down two avenues: it (1) investigates how the enlarged particle content of DG models can lead to altered bounds on current gluino and squark mass limits from Run 2 of the LHC, and (2) makes an in depth study of the Higgs sector in such models, which is automatically aligned owing to extended supersymmetry that links the Yukawa couplings to the gauge couplings in the electroweak sector
Search for new physics with two photons in the final state with the ATLAS detector by Yee chinn Yap( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

<> by Li Yuan( Book )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

<> by Andrea Mogini( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

ADVENTURES OF THE LARGE HADRON COLLIDER, THE : from the big bang to the higgs boson by Daniel Denegri( Book )

1 edition published in 2021 in English and held by 0 WorldCat member libraries worldwide

"An introduction to the world of quarks and leptons, and of their interactions governed by fundamental symmetries of nature, as well as an introduction to the connection that exists between worlds of the infinitesimally small and the infinitely large. The book starts with a simple presentation of the theoretical framework, the so-called Standard Model, which evolved gradually since the 1960's. This is followed by its main experimental successes, and its weaknesses and incompleteness. We proceed then with the incredible story of the Large Hadron Collider at CERN - the largest purely scientific project ever realized. What follows is the discussion of the conception, design and construction of the detectors of size and complexity without precedent in scientific history. The book summarizes the main physics results obtained firstly during the initial phase of operation of the LHC, which culminated in the discovery of the Higgs boson in 2012 (the Nobel Prize in Physics in 2013). This is followed by the results obtained in subsequent years up to 2020, consolidating and expanding these findings. These successes have undoubtedly made CERN the focal point, both of intellectual endeavor and technological innovation in this domain of science. In the last chapter we describe the plans for LHC for the next 15 years and the possible evolution of the field and collider projects considered. The authors are researchers from CNRS, CEA, and CERN, all fully engaged in the LHC program: D Denegri in the CMS experiment, C Guyot, A Hoecker and L Roos in the ATLAS experiment. Some of them are involved since the inception of the project. They give a lively inside view of this amazing scientific and human adventure"--
 
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