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Characterization of the Higgs Boson and Searches for Supersymmetry with CMS

English title Characterization of the Higgs Boson and Searches for Supersymmetry with CMS
Applicant Wallny Rainer
Number 166294
Funding scheme Project funding
Research institution Institut für Teilchen- und Astrophysik ETH Zürich
Institution of higher education ETH Zurich - ETHZ
Main discipline Particle Physics
Start/End 01.04.2016 - 31.03.2018
Approved amount 880'000.00
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Keywords (5)

Higgs Boson; Hadron Collider Physics ; Large Hadron Collider; Supersymmetry; Pixel Detector Technology

Lay Summary (German)

Lead
Einige der wichtigsten wissenschaftlichen Fragen, denen das CMS Experiment am LHC des CERN nachgeht, ist die genauere experimentelle Charakterisierung des im Jahre 2012 gefundenden Higgsbosons sowie die Suche nach Physik jenseits des Standardmodells. Dieses Gesuch widmet sich diesen Fragen in drei Datenanalyse-Ansätzen. Weiterhin unterstützt dieses Gesuch den Upgrade des Pixeldetektors des CMS Experiments, welcher im Jahre 2016 eingebaut werden wird.
Lay summary
Im Jahre 2012 haben die beiden grossen Experimente des Large Hadron Colliders (LHC) am europäischen Teilchenphysikforschungszentrums CERN das Higgsboson entdeckt. Eine wichtige Komponente dieses Gesuchs ist die genaue Bestimmung seiner Eigenschaften mittels des Compact Muon Solenoid (CMS) Experiments. Abweichungen von Eigenschaften des gefundenen Teilchens von denen im Standardmodell vorausgesagten wurden einen indirekten Hinweis auf Physik jenseits des Standardmodells liefern. Dieses Projekt widmet sich der Messung von Prozessen, die eine Bestimmung der Kopplungen des Higgsbosons an schwere Quarks (bottom und top quarks) in Endzuständen mit Vektorbosonen oder top quarks ermöglichen wird. Eine weitere Komponente dieses Projektes ist die Suche nach einer direkten Manifestation neuer Physik in Form der Erzeugung supersymmetrischer Teilchen, die markante Zerfallsignaturen im Detektor hinterlassen. Eine von Forschern der ETH entwickelte Methode benutzt zum Nachweis der Supersymmetrie (SUSY) Leptonen unterschiedlicher Ladung, die zusammen mit einem Z-Boson erzeugt werden. Eine weitere Methode macht sich den Endzustand mit Leptonen gleicher Ladung zunutze, eine Signatur, die im Standardmodell nur selten vorkommt. Dieses Projekt unterstützt weiterhin die Arbeit von ETH Wissenschaftlerinnen und Wissenschaftler am Upgrade des CMS Barrel-Pixel-Detektors für die "Phase 1" Ausbauphase des LHC. Das abgedeckte Aufgabengebiet umfasst den Test des neuen Auslesechips (ROC) für die innerste Lage des Pixeldetektors und Qualitätskontrolle der Pixelmodule. Im Gesuchszeitraum werden die zum Bau des Pixeldetektors benötigten Module von der ETH Gruppe für den Einbau qualifiziert und der Gesamtdetektor am PSI zusammengebaut. Im Frühjahr 2017 wird der neue Pixeldetektor dann am CERN in Betrieb genommen werden.  Diese Arbeiten werden in enger Zusammenarbeit mit Mitarbeitern des Paul-Scherrer-Instituts und der Unversität Zürich durchgefuhrt.
Direct link to Lay Summary Last update: 07.04.2016

Responsible applicant and co-applicants

Employees

Publications

Publication
Serial Powering Optimization for CMS and ATLAS Pixel Detectors within RD53 Collaboration for HL-LHC: System Level Simulations and Testing
Orfanelli Stella, Christiansen Jorgen, Hamer Matthias, Hinterkeuser Florian, Karagounis Michael, Pradas Luengo Alvaro, Marconi Sara, Ruini Daniele (2018), Serial Powering Optimization for CMS and ATLAS Pixel Detectors within RD53 Collaboration for HL-LHC: System Level Simulations and Testing, in Topical Workshop on Electronics for Particle Physics, Santa Cruz, California.
Qualification and calibration tests of detector modules for the CMS Pixel Phase 1 upgrade
Zhu D., Backhaus M., Berger P., Meinhard M., Starodumov A., Tavolaro V. (2018), Qualification and calibration tests of detector modules for the CMS Pixel Phase 1 upgrade, in Journal of Instrumentation, 13(01), C01028-C01028.
Performance of the modules for layer 1 of the CMS phase 1 pixel detector upgrade
Meinhard M., Backhaus M., Berger P., Starodumov A. (2017), Performance of the modules for layer 1 of the CMS phase 1 pixel detector upgrade, in Journal of Instrumentation (JINST), 12, 1-7.
Deep-learning top taggers or the end of QCD?
Kasieczka Gregor, Plehn Tilman, Russell Michael, Schell Torben (2017), Deep-learning top taggers or the end of QCD?, in Journal of High Energy Physics, 2017(5), 6-6.
High rate capability and radiation tolerance of the PROC600 readout chip for the CMS pixel detector
Starodumov A., Berger P., Meinhard M. (2017), High rate capability and radiation tolerance of the PROC600 readout chip for the CMS pixel detector, in Journal of Instrumentation, 12(01), C01078-C01078.
Deep-learned Top Tagging with a Lorentz Layer
Butter A., Kasieczka G., Plehn T., Russell M., Deep-learned Top Tagging with a Lorentz Layer, in SciPost Physics.

Collaboration

Group / person Country
Types of collaboration
CMS experiment, CERN Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Higgs Couplings Talk given at a conference Searches for ttH(bb) production 06.01.2018 Stanford, United States of America Kasieczka Gregor;
TOP2017 Talk given at a conference Overview of boosted top tagging methods 17.09.2017 Braga, Portugal Kasieczka Gregor;
EPS-HEP Talk given at a conference Search for supersymmetry with compressed mass spectra or decays via Higgs bosons at CMS 05.07.2017 Venice, Italy Heidegger Constantin;
EPS-HEP Poster Search for EWK Production of SUSY in Final States with Multiple Leptons at the CMS Experiment at the CERN LHC 05.07.2017 Venice, Italy Heidegger Constantin;
19th International Workshop on Radiation Imaging Detectors Talk given at a conference Performance of the modules for layer 1 of the CMS phase 1 pixel detector upgrade 02.07.2017 Warsaw, Poland Meinhard Maren Tabea;
Rencontres de Blois Talk given at a conference Search for Electroweak Production of Supersymmetry in Final States with Multiple Leptons 30.05.2017 Blois , France Heidegger Constantin;
BOOST 2017 Talk given at a conference Deep-learning Top Taggers or The End of QCD? 20.03.2017 Zurich , Switzerland Kasieczka Gregor;
Rencontres de Moriond EW Talk given at a conference Progress with electroweakino searches with 13 TeV data 20.03.2017 La Thuile, Italy Marionneau Matthieu;
IML Machine Learning Workshop Talk given at a conference Deep-learning Top Taggers or The End of QCD? 20.03.2017 CERN, Geneva, Switzerland Kasieczka Gregor;
ICHEP2016 Talk given at a conference Test beam results of 3D detectors constructed with single-crystal and poly-crystalline diamond 05.08.2016 Chicago, United States of America Wallny Rainer;
DM2016: Dark Matter 2016: From the smallest to the largest scales Talk given at a conference Review of Supersymmetry Searches at 13 TeV with the CMS experimen 29.06.2016 Santander, Spain Martinez Ruiz del Arbol Pablo;
2nd annual Higgstools Meeting Talk given at a conference Higgs hunting in Zurich: CMS Results from ETH 12.04.2016 Granada, Spain Kasieczka Gregor;


Awards

Title Year
Ramón y Cajal fellowship 2016 2016

Associated projects

Number Title Start Funding scheme
178826 Measurement of Higgs Boson Properties and Upgrade of the CMS Pixel Detector for Phase-2 01.04.2018 Project funding
175625 Exploitation and Upgrades of the CMS experiment at the LHC 01.10.2017 Project funding
162665 Physics at 13 TeV with the CMS experiment at the LHC 01.10.2015 Project funding
177017 Inductively Coupled Plasma Etching System for Nanofabrication of Diamond and Silicon Carbide 01.05.2018 R'EQUIP
173602 FLARE 2017-2019: Operation, Computing and Upgrades of the CMS Experiment 01.04.2017 FLARE
166925 FLARE - GRID Infrastructure for LHC Experiments 01.04.2016 FLARE
173600 FLARE - GRID Infrastructure for LHC Experiments 01.04.2017 FLARE
154216 FLARE 2014-16: Operation, Computing and Upgrades of the CMS Experiment 01.04.2014 FLARE
160433 FLARE: Maintenance & Operation for the LHC Experiments 2015 01.04.2015 FLARE
141847 Particle Physics with high-quality data from the CERN LHC 01.10.2012 Sinergia
134939 High pT Physics with CMS and Upgrades of the CMS Barrel Pixel Detector 01.04.2011 Project funding
153664 Measurements of Higgs boson properties and Searches for Supersymmetry with CMS 01.04.2014 Project funding
146398 Search for New Physics and Measurements of Higgs boson properties with CMS 01.04.2013 Project funding

Abstract

With this continuation grant proposal, we would like to request support for our research program in high energy particle physics tackling fundamental questions of the field. The research proposed is conducted with the Compact Muon Solenoid (CMS) experiment operating at the Large Hadron Collider (LHC) at the European Center for Particle Physics (CERN). The proposal is driven by the exploitation of LHC Run 2 at 13 TeV that is now underway providing excellent prospects for the exploration of physics at the TeV energy scale. We also prepare for the upgrades of the CMS detector necessitated by the continuing and future improvements of the LHC accelerator. With the spectacular discovery of a Higgs boson at CERN, a success to which scientists of this proposal have contributed in a leading manner, the measurement of its properties becomes a high priority in order to elucidate whether the new particle indeed plays a crucial role in the mechanism of electroweak symmetry breaking. The precision measurements of its properties will furthermore reveal whether there is physics beyond the Standard Model (SM), such as Supersymmetry (SUSY). Such physics is expected, since without it counterintuitive (and hence theoretically unattractive) fine tuning in the Higgs boson’s radiative corrections would be required to ensure the SM’s validity beyond energy scales of a few Tera-Electronvolts (TeV). In addition, astronomical observations suggest that there is “Dark Matter” in the Universe, the particle physics description of which is still lacking and for which SUSY could provide a viable particle candidate.This proposal attacks these issues in a three-fold manner. We will attempt to firmly establish the existence of the Higgs boson decaying into two b-quarks using the production mode in association with a vector boson (W or Z). This process allows the extraction of the couplings of the Higgs boson to b-quarks and W or Z-bosons. We improve this long-standing effort of the CMS ETH group by extending our efforts in this decay channel by including the vector fusion production process. We will also exploit jet substructure techniques to identify highly boosted b-jets. These methods will also be employed for a new initiative proposed by this funding request which focuses on Higgs boson production in association with top quarks. This process allows the direct extraction of the top-Yukawa coupling to the Higgs field, a fundamental parameter of electroweak symmetry breaking.We continue the search for SUSY using the dilepton final state and expand our searches to multi-lepton final states. The search for SUSY in the same-sign dilepton final state is not only sensitive to the production of SUSY particles via the strong force, but with a suitable optimization is also sensitive to electroweak SUSY production, a channel which becomes important if the mass hierarchy for SUSY squarks and gluinos is beyond the energy reach of the LHC. In the opposite sign dilepton channel, based on the 8 TeV data set of Run 1 we have observed an intriguing deviation (2.6 sigma) in the invariant mass spectrum of the two leptons that could be a background fluctuation or first indication of new physics. During the duration of this grant proposal, we are confident to elucidate the origin of this excess.Our proposal further requests support to continue hardware work for the upgrades of one of the key components of CMS, the barrel pixel detector. Currently the construction of the phase 1 upgrade pixel detector is in full swing, with commissioning of the detector planned for early 2017. Within CMS several consortia have formed to collaborate on the phase 1 upgrade, with ETH Zurich, PSI and University of Zurich forming the Swiss consortium. The role of the ETH Zurich group within the Swiss consortium is the important task of module testing and quality assurance of all modules that will be integrated in the barrel pixel detector.
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