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Probing the Higgs sector at the LHC and beyond

English title Probing the Higgs sector at the LHC and beyond
Applicant Grazzini Massimiliano
Number 173357
Funding scheme Argentina (AJRP)
Research institution Physik-Institut Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Particle Physics
Start/End 01.05.2018 - 30.04.2021
Approved amount 247'385.00
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All Disciplines (2)

Discipline
Particle Physics
Theoretical Physics

Keywords (3)

Higgs physics; Standard Model and beyond; Perturbative computations

Lay Summary (Italian)

Lead
Dopo la scoperta del bosone di Higgs nel 2012, le analisi condotte dagli esperimenti ATLAS e CMS a LHC hanno mostrato che le proprieta' di questa nuova particella sono del tutto simili a quelle previste dal Modello Standard delle particelle elementari. Tuttavia alcuni aspetti come l'accoppiamento del bosone di Higgs con se stesso sono ancora inesplorati. Questo progetto si propone di compiere un passo avanti importante nella descrizione del processo di produzione di uno o piu' bosoni di Higgs a LHC includendo possibili effetti di fisica oltre il Modello Standard.
Lay summary
Il primo run di LHC ha portato nel 2012 a una tappa fondamentale in fisica delle particelle elementari, la scoperta del bosone di Higgs, la particella responsabile della rottura della simmetria elettrodebole, che era stata cercata invano per molti anni. Il secondo run, iniziato nel 2015, ha permesso di studiare le proprietà' della nuova particella e di mostrare che essa e' del tutto simile a quella prevista dal Modello Standard: gli accoppiamenti del bosone di Higgs con le altre particelle sono infatti consistenti con quanto previsto dalla teoria. Tuttavia e' possibile che nuove particelle pesanti contribuiscano alla produzione del bosone di Higgs e che producano un effetto visibile solo a grande momento trasverso. Inoltre il potenziale del bosone di Higgs e' completamente inesplorato. Questo progetto si propone di migliorare la precisione teorica con cui la produzione di uno o piu' bosoni di Higgs e' nota nel Modello Standard e di includere possibili effetti di nuova fisica come piccole deviazioni rispetto al Modello Standard. In particolare, svilupperemo programmi numerici flessibili in grado di incorporare consistentemente questi effetti e che possano essere usati nelle analisi sperimentali.
Direct link to Lay Summary Last update: 19.02.2018

Responsible applicant and co-applicants

Employees

Project partner

Publications

Publication
Lepton-Quark Collisions at the Large Hadron Collider
Buonocore Luca, Haisch Ulrich, Nason Paolo, Tramontano Francesco, Zanderighi Giulia (2020), Lepton-Quark Collisions at the Large Hadron Collider, in Physical Review Letters, 125(23), 231804-231804.
Leptons in the proton
Buonocore Luca, Nason Paolo, Tramontano Francesco, Zanderighi Giulia (2020), Leptons in the proton, in Journal of High Energy Physics, 2020(8), 19-19.
Triple Higgs production at hadron colliders at NNLO in QCD
de Florian Daniel, Fabre Ignacio, Mazzitelli Javier (2020), Triple Higgs production at hadron colliders at NNLO in QCD, in Journal of High Energy Physics, 2020(3), 155-155.
Soft-gluon effective coupling and cusp anomalous dimension
Catani Stefano, de Florian Daniel, Grazzini Massimiliano (2019), Soft-gluon effective coupling and cusp anomalous dimension, in The European Physical Journal C, 79(8), 685-685.
Fiducial distributions in Higgs and Drell-Yan production at N3LL+NNLO
Bizoń Wojciech, Chen Xuan, Gehrmann-De Ridder Aude, Gehrmann Thomas, Glover Nigel, Huss Alexander, Monni Pier Francesco, Re Emanuele, Rottoli Luca, Torrielli Paolo (2018), Fiducial distributions in Higgs and Drell-Yan production at N3LL+NNLO, in Journal of High Energy Physics, 2018(12), 132-132.
Higgs boson production at large transverse momentum within the SMEFT: analytical results
Grazzini Massimiliano, Ilnicka Agnieszka, Spira Michael (2018), Higgs boson production at large transverse momentum within the SMEFT: analytical results, in The European Physical Journal C, 78(10), 808-808.
Soft gluon resummation for Higgs boson pair production including finite Mt effects
de Florian Daniel, Mazzitelli Javier (2018), Soft gluon resummation for Higgs boson pair production including finite Mt effects, in Journal of High Energy Physics, 2018(8), 156-156.

Collaboration

Group / person Country
Types of collaboration
Dr. Stefan Kallweit, University of Milano Bicocca Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. Nigel Glover, University of Durham Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr Marius Wiesemann, CERN Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Dr. Stefano Catani, INFN, Sezione di Firenze Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Daniel de Florian/International Center for Advanced Studies Argentina (South America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel

Scientific events



Self-organised

Title Date Place
Zurich Phenomenology Workshop: The Higgs Boson and the Top Quark 13.01.2020 Zurich, Switzerland

Associated projects

Number Title Start Funding scheme
162487 Jet production in higher orders of perturbation theory 01.10.2015 Project funding
169041 Standard Model and Higgs Physics at the LHC 01.10.2016 Project funding
160814 Particle Physics with high-quality data from the CERN LHC 01.10.2015 Sinergia
188464 Precision Standard Model Physics at the LHC and beyond 01.01.2020 Project funding

Abstract

The first run of the CERN LHC marked a real milestone in particle physics, with the discovery of the long sought Higgs boson, the agent of the Electro-Weak (EW) symmetry breaking. The second run started in 2015 and is going to deliver a wealth of high-quality data at an increased centre-of-mass energy. The results presented at the ICHEP conference this year confirm this expectation but unfortunately do not show evidence for new physics signals. In particular the Higgs boson, re-observed at 13 TeV, appears very close to what expected in the Standard Model (SM). In the absence of a new physics signal, the Higgs sector offers a unique window to probe the mechanism that breaks the EW symmetry.This project ultimately aims at a detailed exploration of the Higgs properties, and, in particular, of the Higgs potential. In the case of single Higgs boson production, the applicants have developed numerical tools to provide accurate theoretical predictions for the Higgs production cross section and important distributions. These predictions became a reference for the experimental community in the last decade. In order to understand the relation between the discovered boson and the electroweak symmetry breaking mechanism it is essential to count on even more accurate theoretical predictions. The Higgs $p_T$ spectrum is an observable which can give important information on possible additional heavy-states contributing to the gluon fusion cross section, and whose knowledge can be further improved. Furthermore, in order to really provide an insight into the scalar potential responsible for spontaneous symmetry breaking, a measurement of the Higgs self-interactions is essential. In the SM the trilinear and quadrilinear couplings of the Higgs are completely determined, while in many new physics scenarios they can deviate from the SM picture. At hadron colliders these couplings can be measured via double and triple Higgs boson production. We plan to set a new standard in the theoretical accuracy for single and multiple Higgs boson production in the SM and, at the same time, to develop flexible tools to incorporate new physics effects in the available calculations by treating them as small effects on top of the most precise SM predictions.
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