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Research in Particle Physics with the CMS detector: Higgs bosons, dark matter, and their association to top quarks

English title Research in Particle Physics with the CMS detector: Higgs bosons, dark matte,r and their association to top quarks
Applicant Canelli Florencia
Number 149844
Funding scheme Project funding
Research institution Physik-Institut Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Particle Physics
Start/End 01.10.2013 - 30.09.2014
Approved amount 149'872.00
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Keywords (6)

Higgs; Dark matter; LHC; Top quark; Particle physics; CMS

Lay Summary (Italian)

Lead
This grant is based on research in particle physics with the CMS detector at the Large Hadron Collider. It is focused on studying the nature of the newly discovered Higgs bosons and on searching for the elusive dark matter particles. These research is done in signatures rich in top quarks. Part of this grant is also used to upgrade the pixel detector at CMS.
Lay summary

Il programma di ricerca finanziato da questo fondo si colloca nell’ambito della fisica sperimentale delle particelle studiata al collisionatore di protoni Large Hadron Collider (LHC) al CERN di Ginevra, in Svizzera. Il presente gruppo dell’Università di Zurigo è parte attiva della collaborazione CMS, uno dei principali esperimenti  di LHC. In particolare, l’attività di ricerca condotta dal gruppo si concentra sullo studio delle proprietà del bosone di Higgs, la particella che è stata recentemente osservata. Tale scoperta  è certamente uno dei maggiori successi del Modello Standard (SM), e capire se si tratta esattamente del bosone di Higgs come descritto da questo modello o da una sua estensione, è una delle più alte priorità della fisica delle particelle.  

D’altra parte, osservazioni cosmologiche hanno evidenziato l’esistenza di materia oscura nell’Universo, un tipo di materia la cui esistenza non è prevista dallo SM, che rende conto del 27% della massa totale dell’Universo. Se la materia oscura è costituita da particelle neutre stabili e debolmente interagenti con il resto della materia, la sua natura potrebbe essere studiata a LHC. Il programma di ricerca finanziato da questo fondo si basa anche sulla ricerca di tali particelle con i dati raccolti ad LHC.  

Per svolgere tale programma, è fondamentale la capacità di identificare quark di tipo $b$ in modo da  ridurre il fondo che sovrasterebbe, altrimenti, il segnale. Tale scopo può essere raggiunto migliorando l’attuale capacità di tracciamento del vertice dell’interazione, ottimizzando la ricostruzione delle tracce delle particelle e utilizzando sofisticati algoritmi per l'identificazione dei getti di particelle prodotti da quark b. Quest’ obiettivo sarà raggiunto grazie al nuovo rivelatore a pixel (BPIX), la cui installazione è prevista per il 2016. Questo fondo finanzia anche il nostro contributo allo sviluppo dell’attuale BPIX e a quello futuro.

Direct link to Lay Summary Last update: 10.10.2013

Responsible applicant and co-applicants

Employees

Collaboration

Group / person Country
Types of collaboration
CMS collaboration 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
TOP 2014 Talk given at a conference Search for physics beyond the SM (no-SUSY) with top quarks 28.09.2014 Nice, France Canelli Florencia;
DM@LHC workshop Talk given at a conference CMS Search for Dark Matter produced in association with top quarks 25.09.2014 Oxford, Great Britain and Northern Ireland Pinna Deborah;
PASCOS 2014 Talk given at a conference Search for dark matter in CMS 22.06.2014 Warsaw, Poland Yang Yong;
CERN European school of particle physics Poster Search for Dark Matter associated top pair production in single-lepton channel with the CMS detector 18.06.2014 Gerderen, Netherlands Pinna Deborah;


Associated projects

Number Title Start Funding scheme
147468 FLARE: Maintenance & Operation for the LHC Experiments 2013 01.04.2013 FLARE
156687 Research in High Energy Physics with the CMS Detector 01.10.2014 Project funding
147470 FLARE - GRID Infrastructure for LHC Experiments 01.04.2013 FLARE
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia
154216 FLARE 2014-16: Operation, Computing and Upgrades of the CMS Experiment 01.04.2014 FLARE

Abstract

This new grant proposal requests support for a research program in high energy particle physics. The research program is based on physics at the CMS (Compact Muon Solenoid) experiment at the LHC (Large Hadron Collider) located at CERN (European Organization for Nuclear Research). After many years of challenging experimental searches, the most wanted elementary particle, the Higgs boson has finally been caught by the ATLAS and CMS experiments at the LHC. With the observation of this new 126 GeV particle a new era in particle physics begins. First, it is essential to determine the properties of the discovered particle with some accuracy to establish if it corresponds to the Higgs boson of the standard model (SM) or of an extended model. Measuring Higgs processes involving final state top quarks, which have the largest coupling to the Higgs boson, will bring invaluable information. The production of Higgs bosons in association with single top quarks and top quark pairs is of central importance in the physics of this proposal. Second, it is important to search for new approaches that can extend the SM and connect to the new physics of dark matter. The experimental signatures of dark matter are often based on missing transverse energy, but can be enhanced by striking signatures involving top quark pairs. Finally, in order to maximize the sensitivity to the ever-increasing LHC data we must measure SM processes with sufficient accuracy. In particular those SM processes which are irreducible backgrounds for the Higgs boson and other new physics signatures.Crucial to the physics program proposed here is our ability to identify $b$-quarks to reduce the otherwise overwhelming background. Improved vertex tracking capabilities, optimized reconstruction and analysis tools which "tag" $b$-quark jets are afforded by the new barrel pixel detector (BPIX) foreseen to be installed in 2016. A key part of this proposal is our contribution to the current and upgraded BPIX. Our activities complement the current work of the Swiss Consortium in CMS (PSI, ETH, University of Zurich) on the pixel detector and strengthen the expertise and participation in the project. This proposal requests funds for a one year time period (September 2013-September 2014) during which time the LHC will be undergoing a maintenance and upgrade period. In early 2015 the first running at 13 TeV and with higher instantaneous luminosity is scheduled. This one-year request gives us flexibility to allow us to react to potential changes in the LHC schedule.
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